Sedimentology & Marine Paleoenvironmental Dynamics


Alexa Fischer, M.Sc.


Institute of Earth Sciences


Ruprecht-Karls-Universität Heidelberg


Im Neuenheimer Feld 234


D-69120 Heidelberg



+49 (0)6221-54 5988






Research Profile:

Hyperthermal events are abrupt warming events which are coupled to the release of large quantities of carbon to the ocean and atmosphere. These events have been shown to share many of the same key characteristics (e.g., rapid input of organic carbon, rapid warming) as the recent warming caused by anthropogenic carbon release, which makes them a prime target to study the mechanisms and effects of past warming events in order to test model predictions and how ecosystems cope with short-term but large CO2 emission events. Up to now these events are known to occur especially during the early Paleogene. My PhD projects aims to investigate if hyperthermal events are exceptional to the early Paleogene or if they are a persistent characteristics of greenhouse climates.  This will be done by generating a high-resolution stable isotope record from the latest Maastrichtian (Cretaceous) derived from benthic and planktic foraminifer accompanied by a reconstruction of sea surface and bottom water temperatures using Mg/Ca measurements.



Academic Education:

 since 09/2021

PhD position at the Institute of Earth Sciences of Ruprecht-Karls University, Heidelberg. Supervisor: Prof. Dr. Oliver Friedrich


M.Sc. Thesis: “Single Foraminifera Na/Ca and Mg/Ca analyses derived from Globigerinoides ruber using femtosecond-LA-ICP-MS” Supervisors: Dr. Ralf Schiebel, Prof. Dr. D. Scholz

04/2020 - 08/2021

Master of Science Geosciences, Johannes-Gutenberg University Mainz, Germany


B.Sc. Thesis: “Nitrogen isotopes in the marine environment” Supervisors: Dr. Ralf Schiebel, Prof. Dr. D. Scholz

10/2016 - 04/2020

Bachelor of Science Geosciences, Johannes-Gutenberg University Mainz, Germany



Research Experience:

05/2017 – 08/2021: Research assistant, Max-Planck-Institute for Chemistry, Climate Geochemistry



Conference Contributions:

  • Fischer, A., Aardema, H.M., Smart, S.M., Repschläger, J., Martinez-Garcia, A., Scholz, D., Schiebel, R., Haug, G.H., 2020. Foraminifera-bound 15N and NO3- 15N in the North Atlantic Ocean. S/Y-Eugen Seibold conference [Poster].



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Latest Revision: 2022-11-07
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