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Dr. Hannah Kleppin





+49 421 218-65441


+49 421 218-9865441



GEO, 5390

Research Interests

  • large scale ocean circulation
  • millennial-scale climate variability during the last glacial (DO-events)
  • mixing in the ocean
  • biogeochemical cycles in the ocean


Current project

I am currently employed in the Cluster of Excellence “The Ocean Floor-Earth’s Uncharted Interface”, in the subproject Enabler Modeling. The overall research topics to be investigated in this subproject are

  • the interaction of marine ecosystems with the shelf-sea and open ocean circulation
  • how these determine fluxes of carbon and nutrients and thus set the budgets of marine biogeochemical cycles
  • more specifically, the role of sinking biogenic particles and the influx of nutrients from sediments for biogeochemical cycles will be investigated


To tackle these research questions we will develop a modeling framework based on a regional set-up of the ocean model MITgcm. Currently we are preparing a set-up of the MITgcm for the North-West African Upwelling area. This exemplary studying area was choosen due to its high productivity, high sedimentation rates and the existence of long data time series for comparison with the model. In order to study above mentioned research question a model of early diagenesis of pelagic sediments (MEDUSA) and an advanced parameterization of particle aggregation and disaggregation will be implemented into MITgcm.



2016 PhD in Climate modelling, Niels Bohr Institute, University of Copenhagen

Thesis: Unforced climate transitions as a scenario for Daansgard-Oeschger events

2012 MSc in Physical Oceanography, University of Hamburg

Thesis: Analysing spiral eddies as an example of baroclinic mixed layer instabilities

2010 BSc in Geophysics/Oceanography, University of Hamburg

Thesis: Zirkulation des atlantischen Wassers in der Arktis


Teaching assistant at the University of Copenhagen:

Geophysical Fluid Dynamics, winter 2013

Steady Ocean circulation, spring 2013

Steady Ocean circulation, spring 2015

Research Cruise

Mediterranean Sea, MSM 13/1-2 (RV Maria S. Merian), 28.09.09 - 22.10.09, Rostock(Germany) – Limassol (Cyprus)


Kleppin, H., Jochum, M., Otto-Bliesner, B., Shields, C. A., & Yeager, S. (2015). Stochastic atmospheric forcing as a cause of Greenland climate transitions. Journal of Climate, 28(19), 7741-7763.https://journals.ametsoc.org/doi/full/10.1175/JCLI-D-14-00728.1


Klockmann, M., Mikolajewicz, U., Kleppin, H., & Marotzke, J. (2020). Coupling of the subpolar gyre and the overturning circulation during abrupt glacial climate transitions. Geophysical Research Letters, 47(21), e2020GL090361.