Dr. Esposito's research interests include Hydraulics and Sediment Transport In River Deltas, Floodplain Sedimentation, Sedimentary Processes within Vegetation, Numerical Modeling of Coastal Morphology and Coastal Zone Management and Infrastructure

Research Projects

This project, developed in close collaboration with coastal restoration practitioners, aims to establish standardized data collection methodology for monitoring and predicting sediment transport within coastal wetland vegetation. The data collection efforts focus on the turbulence generated by marsh vegetation that can keep fine sediment from depositing even in low velocity environments. Restoration practitioners will be able to use the products of this project to improve predictions of marsh sustainability and better assess the effectiveness of restoration efforts.

Selected Recent Publications

Esposito, C.R., DiLeonardo, D., Harlan, M., & Straub, K.M. (2018). Sediment Storage Partitioning in Alluvial Stratigraphy: The Influence of Discharge Variability. Journal of Sedimentary Research.

Esposito, C. R., Shen, Z., Törnqvist, T. E., Marshak, J., & White, C. (2017). Efficient retention of mud drives land building on the Mississippi Delta plain. Earth Surface Dynamics, 5(3), 387–397. https://doi.org/10.5194/esurf-5-387-2017

Esposito, C. R., Georgiou, I. Y., & Kolker, A. S. (2013). Hydrodynamic and geomorphic controls on mouth bar evolution. Geophysical Research Letters, 40(8), 1540–1545. https://doi.org/10.1002/grl.50333

Straub, K. M., & Esposito, C. R. (2013). Influence of water and sediment supply on the stratigraphic record of alluvial fans and deltas: Process controls on stratigraphic completeness. Journal of Geophysical Research: Earth Surface, 1–14. https://doi.org/10.1002/grl.50333

Dr. Bowles' research interests include Biogeochemistry, Microbial Ecology, Geomicrobiology, Molecular Microbiology and Marine Deep Subsurface Biosphere

Current Projects

• Quantifying marine biomass through geologic time
• Processes related to microbial methane emission in coastal areas
• Modeling the methane hydrate inventory along continental shelves
• Processes and factors limiting marine microorganisms
• Evaluation of the metabolic capacity of deep subsurface fungal communities
• Defining the influence of nutrient regime changes on microbial communities

Selected Publications

Bowles, M.W., Hunter, K.S., Samarkin, V.A., Joye, S.B. (2016) Variations in geochemical signatures and microbial activity within and between diverse cold seep habitats along the lower continental slope of the Gulf of Mexico. Deep Sea Research II. Topical Studies in Oceanography 129, 31-40.

Inagaki, F., Hinrichs, K.-U., Kubo, Y., Bowles, M.W., et al. (2015) Exploring deep microbial life in coal-bearing sediment down to ~2.5 km below the ocean floor. Science 349 (6246): 420-424, doi: 10.1126/science.aaa6882.

Bowles, M.W., Mogollón, J.M., Kasten, S., Zabel, M., Hinrichs, K.-U. (2014) Global rates of marine sulfate reduction rates and implications for subseafloor metabolic activities. Science 344(6186): 889-891, doi: 10.1126/science.1249213.

Bowles, M.W., Nigro, L.M., Teske, A.P., and Joye, S.B. (2012) Denitrification and environmental factors influencing nitrate removal in Guaymas Basin hydrothermally-altered sediments. Frontiers in Microbiology. 3:377, doi: 10.3389/fmicb.2012.00377.

Bowles, M.W., Samarkin, V.A., Joye, S.B. (2011) Improved measurement of microbial activity in deep-sea sediments at in situ pressure and gas concentration. Limnology and Oceanography Methods. 9: 499-506.

Bowles, M.W., Samarkin, V.A., Loftis, K.M., and Joye, S.B. (2011) Weak coupling between sulfate reduction and the anaerobic oxidation of methane in methane-rich seafloor sediments in ex situ incubations. Geochimica et Cosmochimica Acta. 75: 500-519, doi:10.1016/j.gca.2010.09.043.

Bowles, M.W., and Joye, S.B. (2010) High rates of denitrification and nitrate removal in cold seep sediments. ISME Journal 5(3): 565-567, doi:10.1038/ismej.2010.134.

Samarkin, V.A., Madigan, M.M., Bowles, M.W., Casciotti, K.L., McKay, C.P., Joye, S.B. (2010) Abiotic nitrous oxide emission from the hypersaline Don Juan Pond in Antarctica. Nature Geoscience, 3: 341-344, doi:10.1038/ngeo847BJ

Dr. Parsley's research interests include Phylogenetics, functional morphology, paleoecology, and mode and tempo of evolution of Lower Paleozoic primitive Echinodermata; Paleobiology and paleoecology of Lower Paleozoic faunas

Select Publications

Parsley, R. L. and Caster, K. E., 1965, North American Soluta (Carpoidea, Echinodermata),  Bull. American Paleontology, Vol. 49, (No. 221), 109- 174.

Hoffmann, H. J., and Parsley, R. L., 1966, Antennae of Ogygopsis, Journal of Paleontology, vol. 40, no. 1, pp. 209-211, 2 figs.

Parsley, R. L., in Caster, K. E., 1968, Family Belemnocystitidae, Treatise on Invertebrate Paleontology Part S, p. 623.

Parsley, R. L.,1970, Revision of the North American Pleurocystitidae (Rhombifera Cystoidea), Bulletin of American Paleontology., vol. 58, no. 260, pp. 135-213, 10 plates, 8 text-figs.

Parsley, R. L., 1972, The Belemnocystitidae: Solutan Homeomorphs of the Anomalocystitidae, Journal of Paleontology vol. 66, no. 3, pp. 341-347, 1 pl., 1 fig.

Parsley, R. L.,1973, Sedimentary Features on the Surface of Mars as Seen from Mariner 6 and 7 Photographs, NASA Contractor Report -CR- 2184, pp. 1-24.

Parsley, R. L.,1975, Systematics and Functional Morphology of Columbocystis, A Middle Ordovician "Cystidean" (Echinodermata) of Uncertain Affinities, Bulletin American Paleontology, vol. 67, Caster Festschrift, pp. 349-361, 1 text-fig., 2 plates.

Parsley, R. L. and Mintz, L., 1975, North American Paracrinoidea: Ordovician: Paracrinozoa, New: Echinodermata), Bulletin of American Paleont., Vol. 68, pp. 1-115, 13 plates, 10 text-figs.

Parsley, R. L.,1978, Thecal Morphology of the Ordovician Paracrinoid Comarocystites (Echinodermata), Journal of Paleontology, vol. 52, no. 2, pp. 472-479, 1 pl., 4 text-figs.

Parsley, R. L., 1980, Homalozoa. In Echinoderms.  Broadhead, T. W., and Waters, J. A. (eds.) Univ. of Tennessee, Dept. Geol. Sciences Studies in Geology, 3, pp. 106-117.

Parsley, R. L.,1980, Paracrinoidea, in Echinoderms (op. cit.), pp. 139-143.

Parsley, R. L., 1981, Echinoderms from Middle and Upper Ordovician Rocks of Kentucky, U. S. Geological Survey Professional Paper 1066K, pp. K1-K9, 1 pl., 1 text-fig.

Parsley, R. L., 1982, Paracrinoids, in Echinoderm faunas from the Bromide Formation (Middle Ordovician) of Oklahoma, Univ. of Kansas Paleontological Contributions, Monograph 1, pp. 212-223, pls. 23, 24, text-figs. 58, 59.

Sprinkle, J. and Parsley, R. L., 1982, "Golf Ball" Paracrinoid, Univ. of Kansas Paleontological Contributions, Monograph 1,  pp. 224-230, pl. 25, text- fig. 60

Parsley, R. L., 1982, Pleurocystitids, Univ. of Kansas Paleontological Contributions, Monograph 1,  pp. 274-279,  pl. 34, text-figs. 67, 68.

Parsley, R. L., 1982,Eumophocystis, Univ. of Kansas Paleontological Contributions, Monograph 1, pp. 280-288, pls. 35, 36, text-figs. 69-71.

Parsley, R. L., 1982, Homalozoans, Univ. of Kansas Paleontological Contributions, Monograph 1,  pp. 322-323.

Parsley, R. L., 1983,  Treatise on Invertebrate Paleontology: Part T, Echinodermata 2, Crinoidea, Review, Journal of Paleontology, vol. 57, no.1, pp. 193-194.

Lewis R., Sprinkle J., Bailey B., Moffit J., and Parsley R., 1987, Mandalacystis, a new rhipidocystid eocrinoid form the Whiterockian stage (Ordovician) in Oklahoma. Journal of Paleontology, 61:6, pp. 1222-1235, 7 figs.

Parsley, R. L.,1988, Probable feeding and respiratory mechanisms in Aristocystites (Diploporida,, Middle-Upper Ordovician of Bohemia, ČSSR). in Burke, R. D. et. al. (eds.), Echinoderm Biology pp. 103-108, 3 text-figs. Proceedings of the 6th International Echinoderm Conference. Balkema, Rotterdam.

Parsley, R. L.,1988, Feeding and respiratory strategies in Stylophora. in, Echinoderm phylogeny and evolutionary biology. Paul, C. R. C. and  A.B. Smith, (eds.), pp. 347-361, 8 text-figs., Oxford Science Publications and Liverpool Geological Society, (Current Geological Concepts 1), Clarendon Press, Oxford,

Parsley, R. L., 1989, Latex casting of macroinvertebrate fossils. In Paleontechniques, Feldmann, R. M. et. al. eds., pp. 275-281, Paleontological Soceity, Special publication no. 4.

Parsley, R. L.,1990, Aristocystites a recumbent diploporid (Echinodermata) from the Middle and Upper Ordovician of Bohemia, ČSSR. Jour. of Paleontology, vol. 64: 2, pp. 2798-293.

Parsley, R. L.,1991, Review of Selected North American Mitrate Stylophorans (Homalozoa: Echinodermata). Bulletin of American Paleontology. vol. 100,  pp.1- 57, 7 plates, 20 text-figs. Paleontological Research Institution, Itheca, New York.

Gutierrez - Marco, J. C., Melendez, B., Parsley, R. L., Prokop, R. J. and Marek, L. 1992.  Equinodermos (Cystoides, Homalozon, Asterozna).  De afinidades Bohemicas en el Ordovicico del los zonas centroiberica y ossa Morena, Espania.  Publ. Mus. Geol. Estremadura, 1:79-81.

Parsley, R. L.,1994, Mitrocystitid functional morphology, evolution, and their relationships with other primitive classes.  In Echinoderms Through Time, David, Bruno, et. al., eds. pp. 167-177, 7 text figs. Balkema Press, Rotterdam

Marek,L., Parsley, R. L., and  A. Galle, 1997. Functional morphology of hyoliths based on flumestudies. Vestnik (Bulletin of the Czech Geological Survey), 72:4 p.351-358.

Parsley, R. L., 1997, The echinoderm classes Stylophora and Homoiostelea: non Calcichordata.  Paleontological Society Papers, 3, p. 225-248.  The Paleontological Society.

Parsley, R. L.  (1998) Community setting and functional morphology of Echinosphaerites infaustus (Fistuliporita:  Echinodermata) from the Ordovician of Bohemia, the Czech Republic.  Vestník (Bulletin of the Czech Geol. Survey), 73:3: 253-265.

Parsley, R. L.,1998, Taxonomic Revision of the Stylophora,  in Mooi, R. and M. Telford eds. Echinoderms—San Francisco, p. 111-117. Proceedings of the Ninth International Echinoderm Conference.  Belkema Press, Rotterdam .

Parsley, R. L.1999, The Cincta (Homostelea) as Blastozoans  In. Carnavali, M.D.C. and F. Bonasoro eds., Echinoderm Research 1998, p. 369-375. Belkema Press, Rotterdam.

Parsley. R. L 2000, Morphological and Paleontological analysis of the Ordovician ankyroid Lagynocystis: (Stylophora: Echinodermata). Journal of Paleontology. 74:2: 254-262. 

Parsley, R. L., R. Prokop, and K. Derstler, 2000, Kirkocystid ankyroids (Stylophora: Echinodermata) from the Šárka Formation of Bohemia.  Vestnik, (Bull. of the Geol. Survey, Czech Republic), 75:1: 37-45.  

David, B;  Lefebvre, B.; Mooi, R; and  Parsley, R. 2000, Are homalozoans echinoderms?  An answer from the extraxial-axial theory.  Paleobiology 24:4: 529-555.

Yuan, X., S. Xiao, Parsley, R. L., C. Zhou, Z. Chen, and J. Hu, 2002, Towering sponges in an Early Cambrian Lagerstatte: Disparity between nonbilaterian and bilaterian epifaunal tiers at the Neoproterozoic-Cambrian transition.  Geology 30:4: 363-366.

Sumrall, C. D. & Parsley, R. L., 2003, Morphology and biomechanical implications of isolated discocystinid plates (Edrioasteroidea, Echinodermata) from the Carboniferous of North America.  Palaeontology, 46 (1) 113-138. (The Palaeontological  Association), London.

Parsley, R. L. & R.J. Prokop, 2004, Functional morphology and paleoecology of some sessile Middle  Cambrian echinoderms from the Barrandian region of Bohemia.  Bulletin of Geosciences 79:3: 147-156

Parsley, R. L., & Y-l  Zhao, 2004, Functional morphology of brachioles in gogiid and other Lower and Middle Cambrian eocrinoids.  In T. Heinzeller & J. Nibelsick eds. Echinoderms: München:  Proc.11th International Echinoderm Conference. Pp. 479- 484. Taylor & Francis, London

Xiao, Shuhai., Jie Hu, Xunlai Yuan, Parsley, R. L., & Ruiji Cao,  2005,  Articulated sponges from the Early Cambrian Hetang Formation in southern Anhui, South China: Their age andimplications for the early evolution of sponges.   Palaeogeography,  Palaeoclimatology,and Palaeoecology  220:89-117,  Elsevier .

Galle, A & Parsley, R. L.,  2005. Epibiont relationships on hyolithids demonstrated by Devoniantabulates (Anthozoa) and Ordovician trepostomes (Bryozoa). Bulletin of  Geosciences.  80:2: 125-138.

Parsley, R.L. & J. C. Gutierrez- Marco  2005.   Stylophorans in Middle Arenig shallow water siliciclastics: Vizcainocarpus from the Imfout Syncline in Morocco's western Meseta.  Bulletin of  Geosciences. 80:3: 185- 192.

Zhao, Y-L, Zhu, M., Babcock, L.E., Yuan, J-L., Parsley, R. L., Peng, J., Yang, Y., and Wang, Y. 2005, Kaili Biota: A taphonomic window on diversification of metazoans from the basal Middle Cambrian:Guizhou, China. Acta  Geologica Sinica, 79:6: 751 – 765.

Parsley, R. L. & Zhao, Y. 2006.  Long-stemmed  eocrinoids in the basal Middle Cambrian Kaili Biota, Taijaing County, Guizhou Province, China.   Journal of Paleontology, 80: 6: 1058-1071.

Zhao,Y-L, Parsley, R. L., & Peng, J. 2007. Early Cambrian eocrinoids from Guizhou Province, China,  Palaeogeography, Palaeoclimentology, Palaeoecology, 254: 317-327  

Parsley, R. L.& C. Sumrall. 2007. New primitive echinoderm genera from the Bois D'Ark Formation: Lower Devonian (Lochkovian) of Coal County, Oklahoma.  Journal of Paleontology,  81:6:1486- 1493.      

Zhao, Y-L,  Parsley, R. L., & Peng,J. 2008  Basal Middle Cambrian short stalked eocrinoidsfrom the Kaili Biota, Taijiang County, Guizhou Province, China.  Journal of Paleontology,  82 ( 2): 369-376.  

Parsley, R. L. 2009. Morphology, ontogeny and heterochrony in Lower and Middle Cambrian gogiids (Eocrinoidea, Echinodermata) from Guizhou Province, China. Paleontological Journal, 43:11; 1406-1414.  Paleontological Institute, Russian Academy of Sciences, Moscow. 

Zhao, Y-L, Yuan, J-L, Peng, J, Fu, Q-P, Lin, J-p, Yang, R-D, Parsley, R.L., Yang, X-L, Guo, Q-J, and Tai, T-S. (2009).  The Kaili Biota,  p. 68-79, (In) Century of the Brilliant Leap [sic] : Paleontology of China. Pp 1-391, Science Press, Beijing. (In Chinese)

Parsley, R. L. & Y. Zhao (2010). A new turban-shaped gogiid eocrinoid from the Kaili  Formation, (Kaili Biota), Balang, Jianhe County, Guizhou Province, China.  Journal of Paleontology, 84:3:549-553

Zhao, Y., Sumrall, C., Parsley, R. L., and Peng, J. (2010).   Kailidiscus, A new plesiomorphic edrioasteroid from the basal Middle Cambrian Kaili Biota of Guizhou Province, China.  Journal of Paleontology, 84:(4): 668-680. 

James Sprinkle, Ronald L. Parsley, Yuanlong Zhao, and Jin Peng, 2011, Revision of lyracystid  eocrinoids from the Middle Cambrian of South China and Western Laurentia,  Journal of  Paleontology, 85: (2): 250-255

Zhao, Y-L (Editor). 2011. The Kaili Biota: Marine organisms from 508 million years ago. Twenty three authors including R.L. Parsley (individual sections not defined but see p.170-179). Guizhou Publishing Group, 251 pages. (In Chinese).

Parsley,  R. L,  S. Rozhnov and C. Sumrall. 2012. Morphologic and Systematic revision of the Solute  Maennilia estonica (Homoiostelea, Echinodermata) from the Upper Ordovician of Estonia.  Journal of Paleontology, 86:3:462-469

Zamura, S, Lefebvre, B., plus 12 authors including Parsley, R. L.,  Cambrian echinoderm diversity and palaeobiogeography, Geological Society of London. Accepted for publication Sept. 22, 2011.

Parsley, R. L. 2012, Ontogeny, functional morphology, and comparative morphology of lower (Stage 4) an basal Stage 5 Cambrian gogiids , Guizhou Province, China. Journal of Paleontology,  86(4): 569-583.

Parsley, R. L. and Zhao, Y.L. 2012.  Gogiid eocrinoids of the Kaili Biota, Guizhou Province, China, in Cryogenian-Ediacarian to Cambrian Stratigraphy and Paleontology of Guizhou, China, in Zhao et al., eds, Journal of Guizhou University (Natural Science) 29 (Supplement 1):16-22.  

 Zhao, Y., Zhu, M., Peng, J., Yuan, J., Parsley, R. L., Babcock, L. Lin, J-P., Yang, X., Yin, L., Sun,H., and Tai, T. 2012.  The Kaili Biota- An informal review commemorating the 30th anniversary of its discovery.  in Cryogenian-Ediacarian to Cambrian Stratigraphy and Paleontology of Guizhou, China, Zhao et al., eds. Journal of Guizhou University (Natural Science) 29 (Supplement 1):1-9.   

Zhao, Y., Peng, J., Yuan, j., Guo, Q., Tai, T., Yin, L., Parsley, R. L, Yang, Y., Yang, X., and  Zhang, P., 2012. The Kaili Formation and Kaili Biota at the Wuliu-Zengjiayan Section of Guizhou Province, China and proposed Global Standard Stratotype Section and Point (GSSP) of the unnamed Cambrian Series 3, Stage 5. In Cryogenian-Ediacarian to Cambrian Stratigraphy and Paleontology of Guizhou, China. Zhao et al., eds, Journal of Guizhou University (Natural Science) 29 (Supplement 1):108-124.

Parsley, R. L. 2012, Development and functional morphology of sutural pores in early and middle Cambrian gogiid eocrinoids from Guizhou Province, China.  Echinoderms in a Changing World.  Proceedings of the 13th International Echinoderm Conference, University of Tasmania, Hobart, Tasmania.  CRC/Balkema Press, Leiden.

Dr. Nelson's research interests include Volcanology, Igneous Petrology, Mexican Volcanic Belt, Geological Hazards and Thermodynamics

Select Publications

Nelson, S.A., Myths of Katrina: Field Notes from a Geoscientist. The Minnesota Review, 2015(84): p 60-68, 2015.

Nelson, S.A. and Leclair, S.F., Katrina’s unique splay deposits in a New Orleans neighborhood. GSA Today, 16:4-9, 2006.

Nelson, S.A. E. Gonzalez-Caver and T.K. Kyser. Constrains on the origin of alkaline and calc-alkaline magmas from the Tuxtla volcanic field, Veracruz, Mexico. Contr. Mineral. Petrol. 122:191-211. 1995.

Nelson, S.A. and E. Gonzalez-Caver. Geology and K-Ar dating of the Tuxtla volcanic field, Veracruz, Mexico. Bull. Volcanology. 55:85-96, 1992.

Verma, S.P., and Nelson, S.A.. Isotopic and trace-element constraints on the origin and evolution of calc-alkaline and alkaline magmas in the northwestern portion of the Mexican Volcanic Belt. J. Geophys. Res. 94:4531-44, 1989.

Grand Canyon

• Grand Canyon Colloquium 2017 Photos & Videos
• Grand Canyon Colloquium 2016 Photos & Videos
• Grand Canyon Colloquium 2015 Photos & Videos
• Grand Canyon Colloquium 2014 Photos & Videos
• Grand Canyon Colloquium 2013 Videos
• Grand Canyon Colloquium 2013 Photos
• Grand Canyon Colloquium 2012 Videos
• Grand Canyon Colloquium 2012 Photos
• Grand Canyon Colloquium 2011 Photos
• Grand Canyon Colloquium 2010 Photos
• Grand Canyon Colloquium 2009 Photos

Dr. Whitten's research interests include Planetary Science, Volcanism, Impact Cratering, Geomorphology, and Radar

More detailed descriptions of this work can be found at Dr. Whitten's research page

Recent Publications

Whitten, J.L., Campbell, B.A. (2018) Lateral continuity of layering in the Mars South Polar Layered Deposits from SHARAD sounding data, J. Geophys. Res., in press, doi:10.1029/2018JE005578.

Campbell, B., Weitz, C., Morgan, G., Whitten, J.L. (2018) Evidence for Impact Melt Sheets in Lunar Highland Smooth Plains and Implications for Polar Landing Sites, Icarus, in press, doi:10.1016/j.icarus.2018.05.025.

Whitten, J.L., Campbell, B.A., Morgan, G.A. (2017) A subsurface depocenter in the South Polar Layered Deposits of Mars, Geophysical Research Letters 44, doi:10.1002/2017GL074069.

Campbell, B.A., Schroeder, D.M., Whitten, J.L. (2017) Mars radar clutter and surface roughness characteristics from MARSIS data, and inferences regarding Europa Sounder Flybys, Icarus 299, 22-30, doi:10.1016/j.icarus.2017.07.011.

Suer, T.-A., Padovan, S., Whitten, J.L., Potter, R.W., Shkolyar, S., Cable, M., Walker, C.C., Szalay, J., Parker, C., Cumbers, J., Gentry, D., Harrison, T., Naidu, S., Trammel, H., Reimuller, J., Budney, C., Lowes, L.L. (2017) FIRE – Flyby of Io with Repeat Encounters: A conceptual design for a New Frontiers mission to Io, Advances in Space Research 60, 10801100, doi:10.1016/j.asr.2017.05.019.

Campbell, B.A., Morgan, G.A., Whitten, J.L., Carter, L.M., Glaze, L.S., Campbell, D.B. (2017) Pyroclastic flow deposits on Venus as indicators of renewed plume activity, J. Geophys. Res. 122, doi:10.1002/2017JE005299.

Whitten, J.L., Campbell, B.A. (2016) Recent volcanic resurfacing of Venusian craters, Geology G3768-1, doi:10.1130/G37681.1. Cover Image, Geology July 2016.

Dr. Törnqvist's research interests include Quaternary geology, Sea-level change, Coastal sustainability, Fluvial and deltaic sedimentology, Sequence stratigraphy, Applied geochronology and Paleoclimatology

 

Research Directions

Holocene ice sheet‒sea level connections.
The sedimentary record of the Mississippi Delta offers unique opportunities to investigate Holocene relative sea-level (RSL) change at very high resolution, and to develop connections with paleoclimate records. Our past efforts have focused, among others, on an abrupt sea-level rise associated with the 8.2 ka cooling event that was likely caused by the final drainage of proglacial Lake Agassiz. More recent work has pushed this record back beyond 10 ka, providing one of the first high-resolution RSL curves for the early Holocene. Combined with glacial isostatic adjustment (GIA) modeling, this sheds light on the relative contribution of the North American and Antarctic ice sheets to global sea-level rise during the second half of the last deglaciation.

Mechanisms and rates of subsidence in low-elevation coastal zones.
Subsidence in rapidly urbanizing, low-lying coastal environments is evolving into a “slow-motion catastrophe.” Our primary focus is on coastal Louisiana and involves the collection and analysis of field data (both geological and instrumental) that is combined with various modeling approaches (GIA models, compaction models) which involves several collaborators. Our Holocene RSL records are a cornerstone of this work, more recently augmented by surface-elevation table – marker horizon data available from the unparalleled Coastwide Reference Monitoring System. A recent addition is the “subsidence superstation” near Myrtle Grove, Louisiana, where a wide range of instrumental and geological methods are integrated to gain a more fundamental understanding about subsidence mechanisms and rates over a range of depth and timescales.

Holocene delta evolution.
There is a resurgence of interest in delta evolution over timescales longer than the instrumental record, motivated by the increasing challenge to successfully manage deltas throughout this century and beyond. Our research involves a variety of projects concerned with rates of delta growth (both vertically and horizontally) as well as patterns of sediment dispersal in the Mississippi Delta. This work relies heavily on geochronology as provided by 14C dating (including novel methods such as ramped PyrOx 14C) and optically stimulated luminescence dating. Much of this research is closely tied to questions that emanate from coastal restoration efforts, such as deciphering the patterns and rates of fluviodeltaic deposition that can serve as analogs for coastal restoration projects by means of river diversions.

Coastal wetland sustainability.
The wetland loss problem in coastal Louisiana is widely documented and there is an enormous interest in the future fate of these highly valuable ecosystems. Our research attempts to determine, among others, which rates of RSL rise coastal wetlands can withstand. Our work has shown that marsh collapse in this area occurs at rates of RSL rise of 3-7 mm/yr, not unlike recent findings for coastal ecosystems worldwide. Many intriguing questions remain, including the need for a better understanding of the conditions that cause marsh drowning and subsequent re-emergence (including possible hysteresis effects), both in coastal Louisiana and elsewhere.

Carbon in the coastal zone.
Coastal plains are increasingly recognized as important repositories of organic carbon, commonly referred to as “blue carbon.” However, the rates and mechanisms of carbon burial are inadequately understood, contributing to uncertainties around the terrestrial sink in global carbon models. Our work examines both modern carbon accumulation rates as well as the ultimate burial of carbon in the stratigraphic record, and relies on a combination of instrumental records, sediment core analysis, and geochronology in a variety of deltaic, coastal, and marine environments.

For more information, please visit the website of the Quaternary Research Group.

 

Selected Recent Publications

Saintilan, N., Horton, B., Törnqvist, T.E., Ashe, E.L., Khan, N.S., Schuerch, M., Perry, C., Kopp, R.E., Garner, G.G., Murray, N., Rogers, K., Albert, S., Kelleway, J., Shaw, T.A., Woodroffe, C.D., Lovelock, C.E., Goddard, M.M., Hutley, L.B., Kovalenko, K., Feher, L. and Guntenspergen, G., 2023. Widespread retreat of coastal habitat is likely at warming levels above 1.5 °C. Nature 621, 112-119.

Nienhuis, J.H., Kim, W., Milne, G., Quock, M., Slangen, A.B.A. and Törnqvist, T.E., 2023. River deltas and sea-level rise. Annual Review of Earth and Planetary Sciences, 51: 79-104.

Dangendorf, S., Hendricks, N., Sun, Q., Klinck, J., Ezer, T., Frederikse, T., Calafat, F.M., Wahl, T. and Törnqvist, T.E., 2023. Acceleration of U.S. Southeast and Gulf coast sea-level rise amplified by internal climate variability. Nature Communications, 14: 1935.

Törnqvist, T.E., Cahoon, D.R., Morris, J.T. and Day, J.W., 2021. Coastal wetland resilience, accelerated sea-level rise, and the importance of timescale. AGU Advances, 2: e2020AV000334.

Shirzaei, M., Freymueller, J., Törnqvist, T.E., Galloway, D.L., Dura, T. and Minderhoud, P.S.J., 2021. Measuring, modelling and projecting coastal land subsidence. Nature Reviews Earth & Environment, 2: 40-58.

Törnqvist, T.E., Jankowski, K.L., Li, Y.-X. and González, J.L., 2020. Tipping points of Mississippi Delta marshes due to accelerated sea-level rise. Science Advances, 6: eaaz5512.

Nienhuis, J.H., Ashton, A.D., Edmonds, D.A., Hoitink, A.J.F., Kettner, A.J., Rowland, J.C. and Törnqvist, T.E., 2020. Global-scale human impact on delta morphology has led to net land area gain. Nature, 577: 514-518.

 

You can find these as well as my other papers at ResearchGate.

Dr. Straub's research interests include Experimental Sedimentology, Quantitative Stratigraphy, Submarine Morphodynamics and Seismic Geomorphology

More detailed descriptions of this work can be found at the website of the TSDS Group.

Recent Publications

Griffin, C., Duller, R.A, Straub, K.M., 2023, The degradation and detection of environmental signals in sediment transport systems, Science Advances, v. 9, eadi8046, DOI: 10.1126/sciadv.adi8046.

Zapp, S., Silvestre, J.R., Sanks, K.M., Shaw, J.B., Dutt, R., Straub, K.M., 2023, Exploring sediment compaction in experimental deltas: Towards a meso-scale understanding of coastal subsidence patterns, Journal of Geophysical Research – Earth Surface, DOI: 10.1029/2023JF007238.

Sanks, K.M., Shaw, J.B., Zapp, S.M., Silvestre, J.R., Dutt, R., Straub, K.M., 2023, Marsh-induced backwater: the influence of non-fluvial sedimentation on a delta’s channel morphology and kinematics, v. 11, p. 1035-1060 Earth Surface Dynamics, DOI: 10.5194/esurf-11-1035-2023.

Straub, K.M., Dutt, R., Duller, R.A., 2023, Coupled channel-floodplain dynamics and resulting stratigraphic architecture viewed through a mass-balance lens, Journal of Sedimentary Research, v. 93, p. 595-616, DOI: 10.2110/jsr.2022.112.

Barefoot, E.A., Nittrouer, J.A., Straub, K.M., 2023, Sedimentary processes and the temporal resolution of sedimentary strata, Geophysical Research Letters, 50, e2023GL103925, DOI: 10.1029/2023GL103925.

Wahab, A., Hoyal, D.C., Shringarpure, M., Straub, K.M., 2022, A dimensionless framework for predicting submarine fan morphology, Nature Communications, v. 13, DOI: 10.1038/s41467-022-34455-7.

Sanks, K.M., Zapp, S.M., Silvestre, J.R., Dutt, R., Shaw, J.B., Straub, K.M., 2022, Experimental investigation of the influence of marsh sedimentation on morphology and mass balance of river deltas, Geophysical Research Letters, 49, e2022GL098513, DOI: 10.1029/2022GL098513.

Toby, S.C., Duller, R.A., De Angelis, S., Straub, K.M., 2022, Morphodynamic limits to environmental signal propagation across landscapes and into strata, Nature Communications, v. 13, DOI: 10.1038/s41467-021-27776-6.

Barefoot, E.A., Nittrouer, J.A., Straub, K.M., 2021, Non-monotonic floodplain responses to changes in flooding intensity, Journal of Geophysical Research – Earth Surface, 126, e2021JF006310, DOI: 10.1029/2021JF006310.

Professional Service

Co-Editor-in-Chief, Chemical Geology, 2016 - present
Associate Editor, American Mineralogist, 2014 - present
Associate Editor, Geochimica et Cosmochimica Acta, 2006 - present

Awards

Clair C. Patterson Medal of the Geochemical Society, 2015
Fellow, Geochemical Society, 2015
Fellow, European Association of Geochemistry, 2015
Fellow, International Association of GeoChemistry, 2014
Fellow, Geological Society of America, 2010

Dr. Johannesson's research interests include low-temperature aqueous geochemistry and biogeochemistry, emphasizing trace element speciation, chemical hydrogeology, and biogeochemical cycling of trace elements (e.g., arsenic, selenium, and REEs) in the environment.

Current Funded Research

EAR-1714030: Quantifying thioarsenate formation constants to advance understanding of arsenic biogeochemical cycling in anoxic waters. Project Location: Tulane University. National Science Foundation, Geobiology and Low-Temperature Geochemistry Program.

PRF #56237-ND2. Tungsten in Petroleum Systems: A Potential Paleo-Environment Indicator. Project Location: Tulane University Chemical Society, The Petroleum Research Fund.

EAR-1141692:  Collaborative Research:  Are buried paleochannels effective reactors for water and solute transport in the deltaic subterranean estuary?  Project location:  Tulane University.  National Science Foundation.

Select Publications

Telfeyan, K., Breaux, A., Kim, J., Cable, J.E., Kolker, A.S., Grimm, D.A., and Johanesson, K.H., 2017. Arsenic, vanadium, iron, and manganese biochemistry in a deltaic wetland, southern Louisiana, USA. Marine Chemistry 192, 32-48

Cui, M. and Johannesson, K.H., 2017. Comparison of tungstate and tetrathiotungstate adsorption onto pyrite. Chemical Geology 464, 57-68

Marsac, R., Banik, N.L., Lutzenkirchen, J., Catrouillet, C., Marquardt, C.M., and Johanesson, K.H., 2017. Modeling metal ion-humic substances complexation in highly saline conditions. Applied Geochemistry 79, 52-64

Prouty, N.G., Swarzenski, P.W., Frackell, J.K., Johannesson, K., and Palmore, D., 2017. Groundwater-derived nutrient and trace element transport to a nearshore Kona coral ecosystem: Experimental mixing model results. Journal of Hydrology: Regional Studies 11, 166-177.

Coleman, D.J., Kolker, A.S., and Johanesson, K.H., 2017. Submarine groundwater discharge and alkaline earth element dynamics in a deltaic coastal setting. Hydrology Research 48.5, 1169-1176.

Vega, M.A., Kulkarni, H.V., Mladenov, N., Johannesson, K., Hettiarachchi, G.M., Bhattacharya, P., Kumar, N., Weeks, J., Galkaduwa, M., and Datta S., 2017. Biogeochemical controals on the release and accumulation of Mn and As in shallow aquifers, West Bengal, India. Frontiers in Environmental Science, 5:20. doi:10.3389/fenvs.2017.00029.

Johannesson, K. H., Palmore, C.D., Frackell, J., Prouty, N.G., Swarzenski, P.W., Chevis, D. A., Telfeyan, K., White, C. D., and Burdige, D.J., 2017. Rare earth element behavior during groundwater - seawater mixing along the Kona Coast of Hawaii. Geochimica et Cosmochimica Acta 198, 229-258.

Blake, J. M., Peters, S.C., and Johannesson, K., 2017. Application of REE geochemical signatures for Mesozoic sediment provenance to the Gettysburg Basin, Pennsylvannia. Sedimentary Geology 349, 103-111.

Datta, S., Vero, S. E., Hettiarchchi, G. M., and Johannesson, K. H., 2017. Tungsten contamination of soils and sediments: Current state of science. Current Pollution Reports, http://dx.doi.org/10.1007/s-40726-016-0046-0.

Kulkarni, H.V., Mladenov, N., Johannesson, K.H., and Datta, S., 2017. Contrasting dissolved organic matter quality in groundwater in Holocene and Pleistocene aquifers and implications for influencing arsenic mobility. Applied Geochemistry 77, 194-205

Mohajerin, T. J., Helz, G. R., and Johannesson, K. H., 2016. Tungsten - molybdenum fractionation in estuarine environments. Geochimica et Cosmochimica Acta 177, 105-119.

Prouty, N. G., Swarzenski, P.W., Frackell, J. K., Johannesson, K., and Palmore, D., 2016. Groundwater-derived  nutrient and trace element transport to a nearshore Kona coral ecosystem: Experimental mixing model results. Journal of Hydrology: Regional Studies, http://dx.doi.org/10.16/j.ejrh.2015.12.058

Yang, N., Shen, Z., Datta, S., and Johannesson, K.H., 2016. High aresenic (As) concentrations in shallow groundwaters of southern Louisiana: Evidence of microbial controls on As mobilization from sediments. Journal of Hydrology: Regional Studies, 5, 100-113.

Telfeyan, K., Johannesson, K.H., Mohajerin, T.J., and Palmore, C.D., 2015. Vanadium geochemistry along groundwater flow paths in contrasting aquifers of the United States: Carrizo Sand (Texas) and Oasis Valley (Nevada) aquifers. Chemicals Geology 410, 63-78

Chevis, D.A., Johannesson, K.H., Burdige, D.J., Cable, J.E., Martin, J.B., and Roy, M., 2015. Rare earth element cycling in a sandy subterranean estuary in Florida, USA. Marine Chemistry, 176, 34-50

Yang, N., Welch, K. A., Mohajerin, T. J., Telfeyan, K., Chevis, D. A., Grimm, D. A., Lyons, W. B., White, C. D., and Johannesson, K. H., 2015. Comparison of arsenic and molybdenum geochemistry in meromictic lakes of the McMurdo Dry Valleys, Antarctica: Implications for oxyanion-forming trace element behavior in permanently stratified lakes. Chemical Geology, 404, 110-125.

Chevis, D. A., Johannesson, K. H., Burdige, D. J., Moran, S. B., and Kelly, R. P., 2015. Submarine groundwater fluxes of rare earth elements to a tidally-mixed estuary in southern Rhode Island. Chemical Geology, 397, 128-142.

Mohajerin T. J., Helz G. R., White C. D., and Johannesson K. H., 2014. Tungsten speciation in sulfidic waters: Determination of thiotungstate formation constants and modeling their distribution in natural waters. Geochimica et Cosmochimica Acta, 144, 157-172.

Yang, N., Winkel, L., and Johannesson, K. H., 2014. Predicting arsenic contamination in shallow groundwater of southern Louisiana, USA. Environmental Science and Technology, 48, 5660-5666.

Leybourne, M. I., Johannesson, K. H., and Asfaw, A., 2014. Chapter 5: Measuring arsenic speciation in environmental media: Sampling, preservation and analysis. In: R. J. Bowell, C. N. Alpers, H. E. Jamieson, D. K. Nordstrom, and J. Majzlan (eds.) Environmental Geochemistry, Mineralogy, and Microbiology of Arsenic. Reviews in Mineralogy and Geochemistry, v. 79, pp. 371-390.

Sankar, M. S., Vega, M. A., Defoe, P. P., Kibria, M. G., Ford, S., Telfeyan, K., Neal, A., Mohajerin, T. J., Hettiarachchi, G. M., Barua, S., Hobson, C., Johannesson, K., and Datta, S., 2014. Elevated arsenic and manganese in groundwaters of Murshidabad, West Bengal, India. Science of the Total Environment, 488-489, 570-579.

Raychowdhury, N., Mukherjee, A., Bhattacharya, P., Johannesson, K., Bundschuh, J., Sifuentes, G. B., Nordberg, E., Martin, R. A., and del Rosario, A., 2014. Provenance and fate of arsenic and other solutes in the Chaco-Pampean plain of the Andean foreland, Argentina: From perspectives of hydrogeochemical modeling and regional tectonic setting. Journal of Hydrology, 518, 300-316.

Mohajerin, T. J., Neal, A. W., Telfeyan, K., Sasihharan, S. M., Ford, S., Yang, N., Chevis, D. A., Grimm, D. A., Datta, S., White, C. D., and Johannesson, K. H., 2014. Geochemistry of tungsten and arsenic in aquifer systems: A comparative study of groundwaters from West Bengal, India, and Nevada, USA. Water, Air, & Soil Pollution, 225, 1792, DOI: 0.1007/s11270-013-1792-x

Johannesson, K. H., Telfeyan, K., Chevis, D. A., Rosenheim, B. E., and Leybourne, M. I. (2014). Rare earth elements in stromatolites – 1. Evidence that modern terrestrial stromatolites fractionate rare earth elements during incorporation from ambient waters. In: Y. Dilek and H. Furnes (eds.) Archean Earth and Early Life. Springer (Dordrecht), pp. 385-411.

Kolker, A. S., Cable, J. E., Johannesson, K. H., Allison, M. A., and Inniss, L. V. (2013) Pathways and processes associated with the transport of groundwater in deltaic systems. Journal of Hydrology 498, 319-334

Johannesson, K. H., Dave, H. B., Mohajerin, T. J., and Datta, S. (2013) Controls on tungsten concentrations in groundwater flow systems:  The role of adsorption, aquifer sediment Fe(III) oxide/oxyhydroxide content, and thiotungstate formation. Chemical Geology (315). 76-94.  PDF Version

Rosenheim, B. E., K. M. Roe, B. J. Roberts, A. S. Kolker, M. A. Allison, and K. H. Johannesson (2013), River discharge influences on particulate organic carbon age structure in the Mississippi/Atchafalaya River System, Global Biogeochemical Cycles, 27, doi:10.1002/gbc.20018.     http://onlinelibrary.wiley.com/doi/10.1002/gbc.20018/abstract

Leybourne M. I., Cameron E. M., Reich M., Palacios C., Faure K., and Johannesson K. H. (2013) Stable isotopic composition of soil calcite (O, C) and gypsum (S) overlying Cu deposits in the Atacama Desert, Chile: Implications for mineral exploration, salt sources, and paleoenvironmental reconstruction. Applied Geochemistry 29, 55-72.

Johannesson K. H. and Neumann K. (2013) Geochemical cycling of mercury in a deep, confined aquifer: Insights from biogeochemical reactive transport modeling. Geochimica et Cosmochimica Acta 106, 25-43.

Johannesson K. H. (2012) "Rare earth element geochemistry of scleractinian coral skeleton during meteoric diagenesis: a sequence through neomorphism of aragonite to calcite: by Webb et al., Sedimentology, 56, 1433-1463: Discussion. Sedimentology 59, 729-732.   http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3091.2011.01264.x/full

Datta S., Neal A. W., Mohajerin T. J., Ocheltree T., Rosenheim B. E., White C. D., and Johannesson K. H. (2011) Perennial ponds are not an important source of water or dissolved organic matter to groundwaters with high arsenic concentrations in West Bengal, India. Geophysical Research Letters 38, L20404, doi:10.1029/2011GL049301     (http://www.agu.org/pubs/crossref/2011/2011GL049301.shtml)

 Willis S. S., Haque S. E., and Johannesson K. H. (2011) Arsenic and antimony in groundwater flow systems: A comparative study. Aquatic Geochemistry 17, 775-807.    (http://www.springerlink.com/content/fv5p9h14765784xu/)

 Willis, S. S. and Johannesson, K. H. (2011) Controls on the geochemistry of rare earth elements in sediments and groundwaters of the Aquia aquifer, Maryland USA. Chemical Geology 285, 32-49   https://authoring.tulane.edu/sse/eens/faculty/kjohanne/upload/Willis-and-Johannesson-2011.pdf

  Pearcy, C. A., Chevis, D. A., Haug, T. J., Jeffries, H. A., Yang, N., Tang, J., Grimm, D. A., and Johannesson, K. H. (2011) Evidence of microbially mediated arsenic mobilization from sediments of the Aquia aquifer, Maryland, USA. Applied Geochemistry 26, 575-586.    http://www.sciencedirect.com/science/article/pii/S0883292711000163

  Johannesson, K. H., Chevis, D.A., Burdige, D.J., Cable, J.E., Martin, J.B., and Roy, M. (2011) Submarine groundwater discharge is an important net source of light and middle REEs to coastal waters of the Indian River Lagoon, Florida, USA, Geochimica et Cosmochimica Acta 75, (2011) 825-843.    https://authoring.tulane.edu/sse/eens/faculty/kjohanne/upload/Johannesson-et-al-2011.pdf

 Tang J. and Johannesson K. H. (2010) Rare earth elements adsorption onto Carrizo sand: Influence of strong solution complexation. Chemical Geology 279, 120-133.  https://authoring.tulane.edu/sse/eens/faculty/kjohanne/upload/Tang-and-Johannesson-2010b-2.pdf

 Tang, J. and Johannesson, K.H. (2010) Ligand extraction of rare earth elements from aquifer sediments: Implications for rare earth element complexation with organic matter in natural waters.Geochimica et Cosmochimica Acta 74.  https://authoring.tulane.edu/sse/eens/faculty/kjohanne/upload/Tang-and-Johannesson-2010.pdf

 Johannesson, K.H. and Tang J. (2009) Conservative behavior of arsenic and other oxyanion-forming trace elements in an oxic groundwater flow system. Journal of Hydrology 378, 13-28. https://authoring.tulane.edu/sse/eens/faculty/kjohanne/upload/Johannesson-and-Tang-2009.pdf

 Leybourne M. I. and Johannesson K. H. (2008) Rare earth elements (REE) and yttrium in stream waters, stream sediments, and Fe–Mn oxyhydroxides: Fractionation, speciation, and controls over REE + Y patterns in the surface environment. Geochimica et Cosmochimica Acta 72, 5962-5983   https://authoring.tulane.edu/sse/eens/faculty/kjohanne/upload/Leybourne-and-Johannesson2008.pdf

 Haque S., Ji. J., and Johannesson K. H. (2008) Evaluating mobilization and transport of arsenic in sediments and groundwaters of Aquia aquifer, Maryland, USA. Journal of Contaminant Hydrology 99, 68-84. https://authoring.tulane.edu/sse/eens/faculty/kjohanne/upload/Haque-et-al-2008.pdf

Leybourne M. I., Peter J. M., Johannesson K. H., and Boyle D. R. (2008) The Lake St. Martin bolide has big impact on groundwater fluoride concentrations. Geology 36, 115-118.

Haque S. E., Tang J., Bounds W. J., Burdige D. J., and Johannesson K. H. (2007) Arsenic geochemistry of the Great Dismal Swamp, Virginia, USA: Possible organic matter controls. Aquatic Geochemistry 13, 289-308.

Basu R., Haque S. E., Tang J., Ji J., and Johannesson K. H. (2007) Evolution of selenium concentrations and speciation in groundwater flow systems: Upper Floridan (Florida) and Carrizo Sand (Texas) aquifers. Chemical Geology 246, 147-169.

Bounds W. J. and Johannesson K. H. (2007) Arsenic addition to soils from airborne coal dust originating at a major coal shipping terminal. Water, Air, and Soil Pollution 185, 195-207.

Cizdziel J. V., Guo C., Steinberg S. M., Yu Z., and Johannesson K. H. (2007) Chemical and colloidal analyses of natural seep water collected from the exploratory studies facility inside Yucca Mountain, Nevada, USA. Environmental Geochemistry and Health 30, 31-44.

Johannesson K. H.and Burdige D. J. (2007) Balancing the global oceanic neodymium budget: Evaluating the role of groundwater. Earth and Planetary Science Letters 253, 129-142.

Johannesson K. H., Hawkins D. L., Jr., and Cortés A. (2006) Do Archean chemical sediments record ancient seawater rare earth element patterns? Geochimica et Cosmochimica Acta 70, 871-890.

Tang J. and Johannesson K. H. (2006) Controls on the geochemistry of rare earth elements along a groundwater flow path in the Carrizo Sand aquifer, Texas, USA. Chemical Geology 225, 156-171.

Haque S. E. and Johannesson K. H. (2006) Concentrations and speciation of arsenic along a groundwater flow-path in the Upper Floridan aquifer, Florida, USA. Environmental Geology 50, 219-228.

Haque S. E. and Johannesson K. H. (2006) Arsenic concentrations and speciation along a groundwater flow path: The Carrizo Sand aquifer, Texas, USA. Chemical Geology 228, 57-71.

Tang J. and Johannesson K. H. (2005) Adsorption of rare earth elements onto Carrizo sand: Experimental investigations and modeling with surface complexation. Geochimica et Cosmochimica Acta 69, 5259-5272.

Johannesson K. H. (2005) Rare Earth Elements in Groundwater Flow Systems. Springer, Dordrecht. (http://www.springeronline.com/sgw/cda/frontpage/0,11855,5-10006-72-3734…)

Johannesson K. H., Cortés A., Ramos Leal J. A., Ramírez A. G., and Durazo J. (2005) Geochemistry of rare earth elements in groundwater from a rhyolite aquifer, central México. In: K. H. Johannesson (ed.) Rare Earth Elements in Groundwater Flow Systems. Springer, (Dordrecht), pp. 187-222.

Tang J. and Johannesson K. H. (2005) Rare earth element concentrations, speciation, and fractionation along groundwater flow paths: The Carrizo Sand (Texas) and Upper Floridan aquifers. In: K. H. Johannesson (ed.) Rare Earth Elements in Groundwater Flow Systems. Springer, (Dordrecht), pp. 223-251.

Shand P., Johannesson K. H., Chudaev O., Chudaeva V., and Edmunds W. M. (2005) Rare earth element contents of high pCO₂groundwaters of Primorye, Russia: Mineral stability and complexation controls. In: K. H. Johannesson (ed.) Rare Earth Elements in Groundwater Flow Systems. Springer, (Dordrecht), pp. 161-186.

Zhou X., Stetzenbach K. J., Yu Z., and Johannesson K. H. (2005) Origin of rare earth element signatures in groundwaters of south Nevada, USA: Implications from preliminary batch leach tests using aquifer rocks. In: K. H. Johannesson (ed.) Rare Earth Elements in Groundwater Flow Systems. Springer, (Dordrecht), pp. 141-160.

Tang J., Whittecar G. R., Johannesson K. H., and Daniels W. L. (2004) Potential contaminants at a dredged spoil placement site, Charles City County, Virginia, as revealed by sequential extraction. Geochemical Transactions 5, 49-60.

Johannesson, K. H., Tang, J., Daniels, J. M., Bounds, W. J., and Burdige, D. J., 2004. Rare earth element concentrations and speciation in organic-rich blackwaters of the Great Dismal Swamp, Virginia, USA. Chemical Geology 208, 217-294.

Johannesson K. H., Cortés A., and Kilroy K. C. (2003) Reconnaissance isotopic and hydrochemical study of Cuatro Ciénegas groundwater, Coahuila, México. Journal of South American Earth Sciences 17, 171-180.

Tang J. and Johannesson K. H. (2003) Speciation of rare earth elements in natural terrestrial waters: Assessing the role of dissolved organic matter from the modeling approach. Geochimica et Cosmochimica Acta 67, 2321-2339.

Ojiambo S. B., Lyons W. B., Welch K. A., Poreda R. J., and Johannesson K. H. (2003) Strontium isotopes and rare earth elements as tracers of groundwater – lake water interactions, Lake Naivasha, Kenya. Applied Geochemistry 18, 1789-1805.

Farnham I. M., Johannesson K. H., Singh A. K., Hodge V. F., and Stetzenbach K. J. (2003) Factor analytical approaches for evaluating groundwater trace element chemistry data. Analytica Chimica Acta  490, 123-138.

Stetzenbach K. J., Hodge V. F., Guo C., Farnham I. M. and Johannesson K. H. (2001). Geochemical and statistical evidence of deep carbonate groundwater within overlying volcanic rock aquifers/aquitards of southern Nevada, USA. Journal of Hydrology 243, 254-271.

Dr. Jackson's research interests include Solid Earth geochemistry and petrology, high temperature and pressure synthesis, and Planetary Science

Publications

CRM Jackson, NR Bennett, Z Du, E Cottrell, Y Fei, (2018), Early episodes of high-pressure core formation preserved in plume mantle, Nature 553 (7689), 491.

AJ Smye, CRM Jackson, M Konrad-Schmolke, MA Hesse, SW Parman, DL Shuster, CJ Ballentine, (2017), Noble gases recycled into the mantle through cold subduction zones Earth and Planetary Science Letters 471, 65-73.

N Dygert, CRM Jackson, MA Hesse, MM Tremblay, DL Shuster, JT Gu, (2018), Plate tectonic cycling modulates Earth's 3He/22Ne ratio Earth and Planetary Science Letters 498, 309-321.

KB Williams*, CRM Jackson, LC Cheek, KL Donaldson-Hanna, SW Parman, CM Pieters, MD Dyar, TC Prissel, (2016), Reflectance spectroscopy of chromium-bearing spinel with application to recent orbital data from the Moon, American Mineralogist 101 (3), 726-734.

Dr. Goehring's research interests include cosmogenic nuclides and surface exposure dating, glacial geology and geomorphology, paleoclimatology and neotectonics

Selected Publications

Menounos, B., Clague, J., Osborn, G., Ponce, F., Davis, P.T., Goehring, B.M., Maurer, M., Rabassa, J., Andrea, Maar, R., 2013. Latest Pleistocene and Holocene Glacier Fluctuations in southernmost Tierra del Fuego, Argentina. Quaternary Science Reviews. 77, 70-79.

Mangerud, J., Goehring, B.M., Lohne, Ø.S., Svendsen, J.-I., Gyllencreutz, R., 2013. The chronology and rate of ice-margin retreat in the major fjords of Western Norway during the Early Holocene. Quaternary Science Reviews. 67, 8-16.

Goehring, B.M., Muzikar, P., Lifton, N.A., 2013. An in situ 14C-10Be Isochron Approach to Interpreting Complex Glacial Histories. Quaternary Geochronology. 15, 61-66.

Goehring, B.M., Vacco, D., Alley, R., 2012. Holocene Dynamics of the Rhone Glacier, Switzerland, Deduced from Ice Flow Models and Cosmogenic Nuclides. Earth and Planetary Science Letters. 351-352, 27-35. doi: 10.1016/j.epsl.2012.07.027.

Sasnett, P.J., Goehring, B.M., Christie-Blick, N., Schaefer, J.M., 2012. Do phreatomagmatic eruptions at Ubehebe Crater (Death Valley, California) relate to a wetter than present hydro-climate?. Geophysical Research Letters. 39(2). doi: 10.1029/2011GL050130.

Goehring, B.M., Schaefer, J.M., Schluechter, C., Lifton, N.A., Finkel, R.C., Jull, A.J.T., Ackçar, N., Alley, R., 2011. The Holocene Rhone Glacier was smaller than today for most of the Holocene. Geology. 39, 679-682.

Goehring, B.M., Kurz, M.D., Balco, G., Schaefer, J.M., and Licciardi, J.M. and Lifton, N.A., 2010. A reevaluation of cosmogenic Helium-3 production rates. Quaternary Geochronology. 5, 410-18.