Peer-reviewed articles

2021

Doering, K., Ehlert, C., Pahnke, K., Frank, M., Schneider, R., & Grasse, P. (2021). Silicon Isotope Signatures of Radiolaria Reveal Taxon-Specific Differences in Isotope Fractionation. Frontiers in Marine Science, 8(666896). doi.org/10.3389/fmars.2021.666896

Tréguer, P. J., Sutton, J. N., Brzezinski, M., Charette, M. A., Devries, T., Dutkiewicz, S., Ehlert, C., Hawkings, J., Leynaert, A., Liu, S. M., Llopis-Monferrer, N., López-Acosta, M., Maldonado, M., Rahman, S., Ran, L., Rouxel, O. (2021). Reviews and syntheses: The biogeochemical cycle of silicon in the modern ocean. Biogeosciences, 18(4), 1269–1289. doi.org/10.5194/bg-18-1269-2021

2020

Paffrath, R., Pahnke, K., Behrens, M. K., Reckhardt, A., Ehlert, C., Schnetger, B., & Brumsack, H.-J. (2020). Rare Earth Element Behavior in a Sandy Subterranean Estuary of the Southern North Sea. Frontiers in Marine Science, 7(424). doi: 10.3389/fmars.2020.00424

Liguori, B. T. P., C. Ehlert & K. Pahnke (2020) The Influence of Water Mass Mixing and Particle Dissolution on the Silicon Cycle in the Central Arctic Ocean. Frontiers in Marine Science, 7(202). doi: 10.3389/fmars.2020.00202.

Geilert, S., P. Grasse, K. Doering, K. Wallmann, C. Ehlert, F. Scholz, M. Frank, M. Schmidt & C. Hensen (2020). Impact of ambient conditions on the Si isotope fractionation in marine pore fluids during early diagenesis. Biogeosciences, 17, 1745-1763. doi: 10.5194/bg-17-1745-2020.

2019

Doering, K., C. Ehlert, P. Martinez, M. Frank & R. Schneider (2019). Latitudinal shifts in d30Si and d15N signatures along the Peruvian shelf: quantifying the effects of nutrient utilization versus denitrification over the past 600 years. Biogeosciences, 16, 2163-2180, doi:10.5194/bg-16-2163-2019

Waska, H., J. Greskowiak, J. Ahrens, M. Beck, S. Ahmerkamp, P. Böning, H. J. Brumsack, J. Degenhardt, C. Ehlert, B. Engelen, N. Grünenbaum, M. Holtappels, K. Pahnke, H. K. Marchant, G. Massmann, D. Meier, B. Schnetger, K. Schwalfenberg, H. Simon, V. Vandieken, O. Zielinski & T. Dittmar (2019). Spatial and Temporal Patterns of Pore Water Chemistry in the Inter-Tidal Zone of a High Energy Beach. Frontiers in Marine Science, 6, 154. doi:10.3389/fmars.2019.00154

2018

Sutton, J. N., L. André, D. Cardinal, D. J. Conley, G. de Souza, J. Dean, J. Dodd, C. Ehlert, M. J. Ellwood, P. J. Frings, P. Grasse, K. Hendry, M. J. Leng, P. Michalopoulos, V. N. Panizzo & G. E. A. Swann (2018). A Review of the Stable Isotope Bio-Geochemistry of the Global Silicon Cycle and Its Associated Trace Elements. Frontiers in Earth Science, 5,112, doi:10.3389/feart.2017.00112

2017

Böning, P., C. Ehlert, J. Niggemann, B. Schnetger & K. Pahnke (2017). Thallium dynamics in the Weser estuary (NW Germany). Estuarine and Coastal Shelf Science, 187, 146-151. doi:10.1016/j.ecss.2016.12.004

Grasse, P., M. Brzezinski, D. Cardinal, G. F. de Souza, P. Andersson, I. Closset, Z. Cao, M. Dai, C. Ehlert, N. Estrade, R. Francois, M. Frank, G. Jiang, J. L. Jones, E. Kooijman, Q. Liu, D. Lu, K. Pahnke, E. Ponzevera, M. Schmitt, X. Sun, J. Sutton, F. Thil, D. Weis, F. Wetzel, A. Zhang & Z. Zhang (2017). GEOTRACES Intercalibration of the Stable Silicon Isotope Composition of Dissolved Silicic Acid in Seawater. Journal of Analytical Atomic Spectrometry. doi:10.1039/c6ja00302h.

2016

Doering K., Z. Erdem, C. Ehlert, S. Fleury, M. Frank & R. R. Schneider (2016). Changes in diatom productivity and upwelling intensity off Peru since the Last Glacial Maximum: Response to basin-scale atmospheric and oceanic forcing. Paleoceanography, 31. doi:10.1002/2016PA002936

Ehlert, C., A. Reckhardt, J. Greskowiak, B. T. P. Liguori, P. Böning, R. Paffrath, H.-J. Brumsack & K. Pahnke (2016). Transformation of silicon in a sandy beach ecosystem: Insights from stable silicon isotopes from fresh and saline groundwaters. Chemical Geology, 440, 207–218. doi:10.1016/j.chemgeo.2016.07.015.

Grasse P., E. Ryabenko, C. Ehlert, M. A. Altabet & M. Frank (2016). Silicon and nitrogen cycling in the upwelling area off Peru: A dual isotope approach. Limnology and Oceanography, doi: 10.1002/lno.10324.

Ehlert C., K. Doering, K. Wallmann, F. Scholz, S. Sommer, P. Grasse, S. Geilert & M. Frank (2016). Stable silicon isotope signatures of marine pore waters – biogenic opal dissolution versus authigenic clay mineral formation. Geochimica et Cosmochimica Acta, 191, 102–117. doi:10.1016/j.gca.2016.07.022

Doering, K., C. Ehlert, P. Grasse, X. Crosta, S. Fleury, M. Frank & R. Schneider (2016). Differences between mono-generic and mixed diatom silicon isotope composi- tions trace present and past nutrient utilisation off Peru. Geochimica et Cosmochimica Acta, 177, 30–47. doi:10.1016/j.gca.2015.12.029

2015

Ehlert, C., P. Grasse, D. Gutiérrez, R. Salvatteci & M. Frank (2015). Nutrient Utilisation and Weathering Inputs in the Peruvian Upwelling since the Little Ice Age. Climate of the Past, 11, 187-202, doi:10.5194/cp-11-187-2015.

2013

Ehlert, C., P. Grasse & M. Frank (2013). Changes in Silicate Utilisation and Upwelling Intensity off Peru Since the Last Glacial Maximum - Insights from Silicon and Neodymium Isotopes. Quaternary Science Reviews, 72, 18-35. doi: 10.1016/j.quascirev.2013.04.013.

Grasse, P., C. Ehlert & M. Frank (2013). The influence of water mass mixing on the dissolved Si isotope composition in the Eastern Equatorial Pacific. Earth and Planetary Science Letters, 380, 60–71. doi:10.1016/j.epsl.2013.07.033.

2012

Ehlert, C., P. Grasse, E. Mollier-Vogel, T. Böschen, J. Franz, G. F. de Souza, B. Reynolds, L. Stramma & M. Frank (2012). Factors controlling the silicon isotope distribution in waters and surface sediments of the Peruvian coastal upwelling. Geochimica et Cosmochimica Acta, 99, 128-145. doi:10.1016/j.gca.2012.09.038.

Cao, Z., M. Frank, M. Dai, P. Grasse, & C. Ehlert (2012). Silicon isotope constraints on sources and utilization of silicic acid in the northern South China Sea. Geochimica et Cosmochimica Acta, 97, 88–104. doi:10.1016/j.gca.2012.08.039.

Etourneau, J., C. Ehlert, M. Frank, P. Martinez, & R. Schneider (2012). Contribution of changes in opal productivity and nutrient distribution in the coastal upwelling systems to late Pliocene/early Pleistocene climate cooling. Climate of the Past, 8, 1435–1445. doi:10.5194/cp-8-1435-2012.

2011

Ehlert, C., M. Frank, B. A. Haley, U. Böniger, P. De Deckker & F. X. Gingele (2011). Current transport versus continental inputs in the eastern Indian Ocean: Radiogenic isotope signatures of clay size sediments. Geochemistry Geophysics Geosystems, 12, Q06017(6), 1-17. doi:10.1029/2011GC003544.

Kindler, P., F. Godefroid, M. Chiaradia, C. Ehlert, A. Eisenhauer, M. Frank, C.-A. Hasler & E. Samankassou (2011). Discovery of Miocene to early Pleistocene deposits on Mayaguana, Bahamas: Evidence for recent active tectonism on the North American margin. Geology, 39(6), 523-526. doi:10.1130/G32011.1

Poster & Presentations

2018

Ehlert, C., A. Studer, X. Crosta, E. Michel, L. Thöle, A. Mazaud, S. L. Jaccard & K. Pahnke. Past changes in nutrient supply and utilization in the Southern OCean from assemblage-specific Si isotopes in diatom opal. Goldschmidt Conference, August 12-17 2018, Boston, USA (Poster)

2017

Ehlert, C., A. Studer, B. Schnetger & K. Pahnke. Past changes in nutrient supply and utilization in the Southern Ocean from combined assemblage-specific Si and N isotopes and trace metals in diatom opal. Isotopes in Biogenic Silica (IBiS) Meeting June 13-15 2017, Blanes, Spain (Talk)

2015

Ehlert, C., R. Paffrath, A. Reckhardt & K. Pahnke: Transformation of silicon in a sandy beach ecosystem: insights from stable silicon isotopes in ground- and pore waters. Isotopes in Biogenic Silica (IBiS) Meeting July 05-07 2015, London, UK (Talk)

2014

Ehlert, C., R. Paffrath, A. Reckhardt & K. Pahnke: Transformation of silicon in a sandy beach ecosystem: insights from stable silicon isotopes in ground- and pore waters. AGU Fall Meeting, December 14-19 2014, San Francisco, USA (Session Convenor, Poster)    

2013

Ehlert, C., K. Doering, K. Wallmann, P. Grasse & M. Frank (2013). Stable silicon isotopes in porewaters off Peru – diatom dissolution versus authigenic clay mineral formation. Goldschmidt Conference, August 25-30, Florence, Italy (Poster)

Ehlert, C., K. Wallmann & M. Frank (2013). Silicon isotopes in sedimentary porewaters – dissolution versus precipitation processes. EnvironMetal Isotopes Conference (EMI). August 18-23, Ascona, Switzerland (Poster)

Ehlert, C., K. Doering, K. Wallmann, P. Grasse & M. Frank (2013). Stable silicon isotopes in sedimentary porewaters – dissolution versus authigenic clay mineral formation processes. Isotopes in Biogenic Silica (IBiS) Meeting. June 03-05, Helsinki, Finland (Talk)

2012

Ehlert, C., P. Grasse & M. Frank (presenting author) (2012). Changes in silicate utilisation and upwelling intensity off Peru – insights from silicon and neodymium isotopes. Geologische Vereinigung (GV) Meeting, September 23-28, Hamburg, Germany (Talk)

Ehlert, C., P. Grasse, D. Gutiérrez, R. Salvatecci & M. Frank (2012). Evolution of Nutrient Utilisation in the Peruvian Upwelling Region Since the Little Ice Age, Isotopes in Biogenic Silica (IBiS) Meeting. May 28-30, Hamburg, Germany (Poster)

2011

Ehlert, C., P. Grasse & M. Frank (2011). Changes in silicate utilization and upwelling intensity off Peru since the LGM – Insights from silicon and neodymium isotopes. Goldschmidt Conference, August 15-19, Prague, Czech Republic (Talk)

Ehlert, C., P. Grasse & M. Frank (2011). Changes in silicate utilization and upwelling intensity off Peru since the LGM – insights from silicon isotopes. EGU General Assembly 2011, April 03-08, Vienna, Austria (Talk)

2010

Ehlert, C., P. Grasse, M. Frank & L. Stramma (2010). Silicon isotope distribution in the Peruvian coastal upwelling area. 10th International Conference on Paleoceanography (ICP), August 29-September 03, San Diego, USA (Poster)

2009

Ehlert, C., M. Frank, B. A. Haley, F. X. Gingele & P. De Deckker (2009). Radiogenic isotope signatures of clay-size sediments in the Eastern Indian Ocean: Weathering inputs and current regimes during the latest quaternary. Goldschmidt Conference, June 21-26, Davos, Switzerland (Poster)