Dr. Moritz Hallmaier

Research Division 2: Marine Biogeochemistry
RU Marine Geosystems

Office:
Room: 8E-102
Phone: +49 431 600 2109
E-Mail: mhallmaier(at)geomar.de

Address:
GEOMAR | Helmholtz Centre for Ocean Research Kiel
Wischhofstraße 1-3
D-24148 Kiel

ORCID:
https://orcid.org/0000-0001-9056-9396

Research interests

Paleoclimate and Paleoceanography
Marine Isotope Geochemistry
Southern Ocean - Antarctic Ice Sheet interaction
Southern Ocean circulation - Earth's climate interaction
Southern Hemisphere Deep Water Formation

Resume

2023 – 2026: PhD, GEOMAR Helmholtz Centre for Ocean Research Kiel
DFG Project as part of the International Ocean Discovery Program (IODP): Climatically controlled sedimentation dynamics and export productivity at IODP Site U1537 in the Scotia Sea (Southern Ocean) over the past four glacial cycles

04/2025 - 06/2025: Visiting PhD Researcher at Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA
03/2022: Research Stay at Géosciences Paris Sud (GEOPS), Université Paris Saclay
2020 – 2022: M.Sc. Physics, Ruprecht-Karls-University Heidelberg
M. Sc. Thesis: The Uranium and Neodymium Isotopic Composition of Seawater in the North East Atlantic at the Institute of Environmental Physics, Heidelberg
2016 – 2020: B.Sc. Physics, Ruprecht-Karls-University Heidelberg
B. Sc. Thesis: Expansion of Pacific sourced deep water in the South Atlantic during past climate changes at the Institute of Environmental Physics, Heidelberg

Publications

Hallmaier, M., Gutjahr, M., Lippold, J., Hemming, S. R., Gerber, L., Weber, M. E., & Eisenhauer, A. (2025). Authigenic uranium preservation and bottom water oxygenation in the Scotia Sea. Geochemistry, Geophysics, Geosystems, 26, e2025GC012415. https://doi.org/10.1029/2025GC012415
Hallmaier, M., Rückert, E.M., Chen, Y. et al. Glacial Southern Ocean deep water Nd isotopic composition dominated by benthic modification. Sci Rep 15, 2586 (2025). doi.org/10.1038/s41598-025-86350-y

Selcted Conference Contributions

2026	EGU General Assembly; Vienna, Austria Hallmaier, M.; Gutjahr, M.; Hemming, S.R.; Lippold, J.; Weber, M.E.; & Eisenhauer, A: Climate state dependent sedimentation dynamics in the southern Scotia Sea during the last four glacial cycles.
2026	EGU General Assembly; Vienna, Austria Gutjahr, M.; Thomsen, S.; Hallmaier, M.; Gebhardt, C.; & Ohlendorf, C.: Continental runoff lead isotopic signatures released during incongruent chemical weathering in subarctic Lake Melville associated with the retreat of the Laurentide Ice Sheet over the past 14 ka.
2026	IODP/ICDP Colloquium; Münster, Germany Hallmaier, M.; Gutjahr, M.; Hemming, S.R.; Lippold, J.; Weber, M.E.; & Eisenhauer, A: Increased northward export of Weddell Sea Deep Water into the ScotiaSea to IODP Site U1537 during deglaciations.
2025	International Conference on Paleoceanography (ICP15); Bangalore, India Hallmaier, M.; Gutjahr, M.; Lippold, J.; Esper, O.; Hemming, S. R.; Gerber, L.; Weber, M. E.; & Eisenhauer, A: Sedimentation Dynamics in the Scotia Sea during the last Four Glacial-Interglacial Cycles.
2025	Goldschmidt Conference; Prague, Czech Republic Hallmaier, M.; Gutjahr, M.; Lippold, J.; Esper, O.; Hemming, S.R.; Gerber, L.; Weber, M.E.; & Eisenhauer, A: Variations in Ventilation and Deep-Water Export in the Scotia Sea during Glacial-Interglacial Cycles.
2024	IODP/ICDP Colloquium; Bremerhaven, Germany Hallmaier, M.; Gutjahr, M.; Lippold, J.; Hemming, S.R.; Weber, M.E.; & Eisenhauer, A: Sedimentation Dynamics and Provenance in the Scotia Sea during the past 170 ka: Insights from IODP Site U1537.
2023	IODP/ICDP Colloquium; Hannover, Germany Hallmaier, M.; Gutjahr, M.; Lippold, J.; Hemming, S.R.; Weber, M.E.; & Eisenhauer, A: Climatically controlled sedimentation and productivity dynamics at IODP Site U1537 in the Scotia Sea.
2023	Goldschmidt Conference; Lyon, France Rückert, E.M.; Hallmaier, M.; Frank, N.: Temporally and spatially stable ε_Nd gradient in the Atlantic Ocean.
2022	EGU General Assembly; Vienna, Austria – remote Hallmaier, M.; Rückert, E.M.; Link, J.; Lütkes, L.; Frank, N.: Dominance of Pacific Sourced Deep Water in the Atlantic sector of the Southern Ocean during the last glacials.