Dr. Moritz Hallmaier

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

• since 2026: PostDoc, GEOMAR Helmholtz Centre for Ocean Research Kiel
   
• 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
   
• 04/2025: SR2510 - RV Sally Ride, Eastern Pacific, Juan de Fuca Ridge
    
• 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

Selected 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 εNd 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.