GEOMAR  Clemens, David

David Clemens M.Sc.

PhD candidate

Research Devision 2: Marine Biogeochemistry Link
Research Unit: Marine Geosystems Link
Working Group: Benthic Biogeochemistry Link

Contact

+49 431 600-2105
dclemens(at)geomar.de

Room 103, Building 8E
GEOMAR Helmholtz Centre for Ocean Research Kiel
Wischhofstraße 1-3
24148 Kiel
Germany
Map

ResearchGate

ORCID

Education

since 2016 PhD candidate at GEOMAR Helmholtz Centre for Ocean Research Kiel
2014 – 2016 Master Marine Geosciences at the Christian-Albrechts-Universität zu Kiel
2011 – 2014 Bachelor Geosciences at the Christian-Albrechts-Universität zu Kiel

Theses

Master Thesis (2016)
The geological structure of Amrum Bank (North Sea) based on parametric sediment echosounder data
supervisors: Dr. Klaus Schwarzer, Prof. Dr. Karl Stattegger

Bachelor Thesis (2014)
Quantifying benthic organic matter decomposition in the Mauritanian oxygen minimum zone (18° N)
supervisors: Dr. Stefan Sommer, Prof. Dr. Klaus Wallmann

Projects

DAM pilot mission "MGF Baltic Sea" (since 2020)
Exclusion of mobile bottom-contact fishing in marine protected areas of the German Exclusive Economic Zone of the North Sea and Baltic Sea
role: scientist in work package 1.3 
more...

SFB 754 (2016 - 2020)
SFB 754 – Climate-Biogeochemistry Interactions in the Tropical Ocean
role: PhD candidate in subproject B6
more...

STopP (2016)
STopP – from sediment to top predator – influence of sea floor properties on benthos and benthivorous birds
role: Master's student
more...

Expeditions

2014 RV Meteor (M107), eastern tropical North Atlantic
2015 RV Poseidon (POS487), Gotland Basin, Baltic Sea
2017 RV Meteor (M136), eastern tropical South Pacific
2017 RV Meteor (M137), eastern tropical South Pacific
2020 RV Elisabeth-Mann-Borgese (EMB238), Fehmarn Belt, Baltic Sea
2021 RV Elisabeth-Mann-Borgese (EMB267), Oderbank, Baltic Sea
2021 RV Elisabeth-Mann-Borgese (EMB268), Baltic Sea

Publications

Jump to: 2022 | 2021 | 2020 | 2019 | 2018 | 2017
Number of items: 14.

2022

[thumbnail of fmars-09-902062.pdf] [thumbnail of Data Sheet 1.PDF]

Dale, A. W. , Clemens, D. , Dähnke, K., Korth, F. , Wankel, S. D., Schroller-Lomnitz, U., Wallmann, K. and Sommer, S. (2022) Nitrogen cycling in sediments on the NW African margin inferred from N and O isotopes in benthic chambers. Open Access Frontiers in Marine Science, 9 . Art.Nr. 902062. DOI 10.3389/fmars.2022.902062.

[thumbnail of remotesensing-14-02782.pdf] [thumbnail of remotesensing-14-02782-s001.zip]

Schönke, M., Clemens, D. and Feldens, P. (2022) Quantifying the Physical Impact of Bottom Trawling Based on High-Resolution Bathymetric Data. Open Access Remote Sensing, 14 (12). Art.Nr. 2782. DOI 10.3390/rs14122782.

[thumbnail of Fahrtbericht AL570 Sommer et al-1.pdf]

Sommer, S., Arndt, H., Bernsee, S., Clemens, D. , Gogina, M., Hoffmann, S., Janßen, M., Kallmeyer, J., Kitte, A., Piontek, J. , Roeser, P., Sachs, M., Surberg, R., Türk, M. and Jürgens, K. (2022) Potential effects of the exclusion of bottom fishing in the marine protected areas (MPAs) of the western Baltic Sea – third year observations. Cruise No. AL570, 22.03. – 11.04.2022, Kiel (Germany) – Kiel (Germany). MGF-OSTSEE-2022. Open Access . Alkor-Berichte, AL570 . GEOMAR Helmholtz Centre for Ocean Research, 74 pp. DOI 10.3289/CR_AL570.

2021

[thumbnail of Accepted article] [thumbnail of 2020GB006583.pdf]

Dale, A. W. , Paul, M., Clemens, D. , Scholz, F., Schroller-Lomnitz, U., Wallmann, K. , Geilert, S. , Hensen, C. , Plass, A., Liebetrau, V., Grasse, P. and Sommer, S. (2021) Recycling and burial of biogenic silica in an open margin oxygen minimum zone. Open Access Global Biogeochemical Cycles, 35 (2). e2020GB006583. DOI 10.1029/2020GB006583.


Zeller, M., Kallmeyer, J., Clemens, D. , Schönke, M., Feldens, P., Sommer, S. and Böttcher, M. E. (2021) Impact of bottom contact trawling on benthic biogeochemical cycling in the Southern Baltic Sea. [Talk] In: Goldschmidt Conference 2021. , 04.-09.07.2021, Online .

2020

[thumbnail of os-16-1347-2020.pdf]

Lüdke, J. , Dengler, M. , Sommer, S., Clemens, D. , Thomsen, S. , Krahmann, G. , Dale, A. W. , Achterberg, E. P. and Visbeck, M. (2020) Influence of intraseasonal eastern boundary circulation variability on hydrography and biogeochemistry off Peru. Open Access Ocean Science, 16 . pp. 1347-1366. DOI 10.5194/os-16-1347-2020.

2019

[thumbnail of EGU2019-14991.pdf]

Lüdke, J. , Clemens, D. , Dengler, M. , Krahmann, G. , Sommer, S., Thomsen, S. and Visbeck, M. (2019) Influence of eastern boundary circulation variability on hydrography and biogeochemistry off Peru in early 2017. [PICO] In: EGU General Assembly 2019. , 07.-12.04.2019, Vienna, Austria .

[thumbnail of 2860.full.pdf]

Glock, N., Roy, A. S., Romero, D., Wein, T., Weissenbach, J., Revsbech, N. P., Høgslund, S., Clemens, D. , Sommer, S. and Dagan, T. (2019) Metabolic preference of nitrate over oxygen as an electron acceptor in foraminifera from the Peruvian oxygen minimum zone. Open Access PNAS Proceedings of the National Academy of Sciences of the United States of America, 116 (8). pp. 2860-2865. DOI 10.1073/pnas.1813887116.

[thumbnail of Author's accepted manuscript] [thumbnail of Schroller-Lomnitz.pdf]

Schroller-Lomnitz, U., Hensen, C. , Dale, A. W. , Scholz, F., Clemens, D. , Sommer, S., Noffke, A. and Wallmann, K. (2019) Dissolved benthic phosphate, iron and carbon fluxes in the Mauritanian upwelling system and implications for ongoing deoxygenation. Open Access Deep Sea Research Part I: Oceanographic Research Papers, 143 . pp. 70-84. DOI 10.1016/j.dsr.2018.11.008.

2018


Clemens, D. , Lüdke, J. , Dengler, M. , Dale, A. W. , Wallmann, K. and Sommer, S. (2018) Benthic N-cycling in the Peruvian Oxygen Minimum Zone in relation to variable bottom water redox conditions. [Talk] In: Ocean Deoxygenation Conference. , 03.09.-07.09.2018, Kiel, Germany .


Lomnitz, U., Scholz, F., Dale, A. W. , Sommer, S., Plaß, A., Clemens, D. , Stolpovsky, K., Wallmann, K. and Hensen, C. (2018) A benthic phosphorus budget for the Peruvian oxygen minimum zone. [Talk] In: Ocean Deoxygenation Conference. , 03.09.-07.09.2018, Kiel, Germany .


Lüdke, J. , Clemens, D. , Dengler, M. , Krahmann, G. , Schmidtko, S. , Sommer, S., Thomsen, S. and Visbeck, M. (2018) Intra-seasonal variability of the eastern boundary circulation off Peru and biogeochemical consequences. [Talk] In: Ocean Deoxygenation Conference 2018. , 03.-07.09.2018, Kiel, Germany .


Stolpovsky, K., Sommer, S., Roy, A. S., Scholz, F., Plaß, A., Wallmann, K. , Lomnitz, U., Clemens, D. , Hensen, C. and Dale, A. W. (2018) An experimental and modeling investigation of sediment nutrient cycling during further deoxygenation on the Peruvian margin. [Poster] In: Ocean Deoxygenation Conference. , 03.09.-07.09.2018, Kiel, Germany .

2017

[thumbnail of fmars-04-00018.pdf]

Sommer, S., Clemens, D. , Yücel, M., Pfannkuche, O., Hall, P. O. J., Almroth-Rosell, E., Schulz-Vogt, H. N. and Dale, A. W. (2017) Major Bottom Water Ventilation Events Do Not Significantly Reduce Basin-Wide Benthic N and P Release in the Eastern Gotland Basin (Baltic Sea). Open Access Frontiers in Marine Science, 4 (18). DOI 10.3389/fmars.2017.00018.

This list was generated on Sat Dec 6 17:43:57 2025 CET.

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