Marine Klimaforschung

AG Paläoklimamodellierung

ArbeitsschwerpunkteImagebild Modellsimulation

Our current work focuses on the spatial and temporal evolution of temperature and precipitation changes as well as ocean acidification in selected warm periods from the past 130.00 years. We assess natural and anthropogenic forcing mechanisms, i.e. variations in the earth’s orbit, solar radiation and volcanic eruptions on the one hand, and increasing green house gas concentrations on the other. These variations affect temperature, precipitation, oceanic carbonate concentrations and atmospheric CO2 levels. They can thus disturb ocean circulation as well as the hydrological and biogeochemical cycles and cause drastic changes in regional climate patterns.

We use a climate model designed for predictive purposes and extend the simulations to the past. These model data are individually analysed and compared with high-resolution marine climate proxy-data sets.

The core questions of the analyses are:

  • Does the model reflect the measured climate mean states, variability and trends, and are the trends plausible?
  • What are the contributions of anthropogenic and natural forcing mechanisms respectively to climatic changes?
  • Which feedback mechanisms act between the different compartments (ocean, atmosphere, marine biosphere)?

Our research results can support scientists examining the changing chemistry at the ocean surface, living ocean resources, sea level rise and other fields of immediate urgency in the face of the ongoing climate change. We also contribute to the development of climate models that can quantitatively simulate paleoenvironmental geochemical and isotope proxies for direct comparison with regional or global-scale paleoenvironmental proxy data sets. Such models will allow for advanced estimates for past and future magnitudes of ocean acidification, continental droughts, floods, vegetation changes, weathering and river runoff on long time scales.

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