School of GeoSciences

School of GeoSciences

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Dr Laetitia Pichevin




My research interest focuses on the marine biogeochemical cycles of C, N, Si and Fe in order to understand the causes of past changes in the marine carbon cycle and in marine nutrient inventories, and their implications for greenhouse gas concentrations. I have used a range of geochemical tools (N, C & Si isotopes, biomarkers, major and trace elements) to tackle questions centred on past climate changes and marine biogeochemical cycles


SELECTED PUBLICATIONS

Pichevin, L., P. Bertrand, M. Boussafir, J.-R. Disnar (2004). Organic Matter Accumulation and Preservation Controls in a Deep-Sea Modern Environment: an example from Namibian Slope sediments. Organic Geochemistry, 35, p.543-599

Pichevin, L., P. Martinez, P. Bertrand, R. Schneider, J. Giraudeau, K. Emeis (2005). Nitrogen Cycling on the Namibian Shelf and Slope over the last two Climatic Cycles: Local and Global Forcings. Paleoceanography, 20, 2

Pichevin, L., M. Cremer, J. Giraudeau, P. Bertrand (2005). A 190 kyr Record of Lithogenic Grain-size on the Namibian Slope: Forging a Tight Link between Past Wind-strength and Coastal Upwelling Dynamics. Marine Geology, 218, 81-96.

Martinez, P., Lamy, F., Robinson, R. R., Pichevin, L., Billy, I. (2006). Atypical δ15N Variation at the Southern Boundary of the East Pacific Oxygen Minimum Zone over the Last 50 kyr. Quaternary Science Reviews, 25 (21-22), 3017-3028.

Pichevin, L., Bard E., Martinez P., Billy I. (2007) Evidence of Ventilation Changes in the Arabian Sea during the Late Quaternary: Implication for Denitrification and Nitrous Oxide Emission. Global Biogeochemical Cycles 21, GB4008, doi:10.1029/2006GB002852

Pichevin, L. E., Reynolds, B. C., Ganeshram, R. S., Cacho, I., Pena, L., Keefe, K. & Ellam, R. M. (2009) Enhanced carbon pump inferred from relaxation of nutrient limitation in the glacial ocean. Nature, 459, doi:10.1038/nature08101

Pichevin, L. E., Ganeshram, R. S., Francavilla, S., Arellano-Torres, E., Pedersen, T. F. & Beaufort, L. (2010) Inter-hemispheric leakage of isotopically heavy nitrate in the Eastern Tropical Pacific during the last glacial period. Paleoceanography 25, PA1204, doi:10.1029/2009PA001754

Geibert, W., Assmy, P., Bakker, D. C. E., Hanfland, C., Hoppema, M., Pichevin, L., Schröder, M., Schwarz, J. N., Stimac, I., Usbeck, R., and Webb, A. (2010) High productivity in an ice melting hotspot at the eastern boundary of the Weddell Gyre. Global Biogeochemical Cycles 24 GB3007 DOI: 10.1029/2009GB003657 

Arellano-Torres, E.,  Pichevin, L. E.,  Ganeshram, R.S., (2011) High-resolution opal records from the eastern tropical Pacific provide evidence for silicic acid leakage from HNLC regions during glacial periods, Quaternary Science Reviews, 30, 1112-1121. DOI: 10.1016 /j.quascirev.2011.02.002

McClymont E. L, Ganeshram R. S., Pichevin L. E., Talbot H.l M., van Dongen B. E., Thunell R., Haywood A. M., Singarayer J. S. and Valdes P. J. (2012)  Sea-surface temperature records of Termination 1 in the Gulf of California: challenges for seasonal and inter-annual analogues of tropical Pacific climate change Paleoceanography 27, PA2202, doi:10.1029/2011PA002226

Pichevin, L. E., Ganeshram R. S., Reynolds B. C., Prahl F., Pedersen T. F., Thunell R., McClymont E. L. (2012) Silicic Acid Biogeochemistry in the Gulf of California: Insights from Sedimentary Si Isotopes, Paleoceanography 27, PA2201, doi:10.1029/2011PA002237 (Editor’s highlight)


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Pichevin, L. E., Ganeshram,R.S., Geibert, W., Thunell, R. Transient Iron Limitation Controls the Silicon Sink in the Coastal Ocean (In prep).



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MAIN CONFERENCES ATTENDED


Annual V M Goldschmidt Conference, Prague, Czech Republic, 2011

AGU Fall meeting, San Francisco, USA, dec. 2009

Annual V M Goldschmidt Conference Vancouver, Canada, July 2008

ICP IX, Shanghai, China, Sept. 2007

AGU Fall meeting, San Francisco, USA, dec. 2006

EGU meeting, Vienna, Austria, apr. 2006

ICP VIII, Biarritz, France, Sept. 2004

EUG-AGU-EGS meeting, Nice, France, apr. 2003

AGU Fall meeting, San Francisco, USA, dec. 2002