New Multivariate Dataset HIRESAFF
Reconstruction of Higly Resolved Atmospheric Forcing Fields for NE-Europe since 1850 AD |
We reconstructed a new dataset of spatio-temporal HIghly RESolved Atmospheric
Forcing Fields ( HIRESAFF) for Northern Europe since 1850. As an outcome of the BONUS project
ECOSUPPORT, the reconstructed fields provide a new basis
for ecosystem (or similar) models to run longer simulations also prior to a large human impact on the North and Baltic Sea. The dataset also allows a better
validation and estimation of model uncertainties under different climatic or nutrient load conditions.
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| Implementation and testing of salt-lake parametrization for the Baltic Sea
in the Regional Climate Model COMSO-CCLM |
The regional climate model COSMO-CLM will be used to numerically downscale different global simulations from the Earth System Model ECHAM5/MPIOM.
The regional model domain covers Northern Europe with a special treatment of the Baltic Sea as a salt water lake. The standard fresh water lake parametrization
scheme FLake is extented to account for physical processes related to salinity
(i.e. freezing temperature and density). The "Baltic salt lake" is expected to develop its own regional climate instead of being bound to prescribed
global SST's from the driving global model.
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Non-Stationary between Atmospheric Circulation and near-surface Climate
over the North Atlantic European sector and the Baltic Sea since 1000 A.D. |
The North Atlantic Oscillation (NAO) has a large influence on the European climate i.e. in the winter halfyear (ONDJFM), explaining up to
one third of the temperature and precipitation variability. However, the relation between the NAO-Index (zonal index which explains the strength
of the westerly winds) and the climate seems to be not stable in time and space. As an example it can be shown that the first leading EOF of SLP
over the North Atlantic region is partly not identical with the NAO-pattern - although the NAO is usually expected and defined as leading EOF. In
this study we analyse changes in the relation between the atmospheric circulation and the climate with focus on changes in the spatial correlation
patterns over the Baltic Sea region in the last 1000 years.
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Historical Evolution of the North-Atlantic-Oscillation (NAO) since 1500 A.D.
and its Influence on Climate and Human Affairs in Europe
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In cooperation with the University of Stuttgart, Institute for Geography and the Gothenburg University, Climate
Ocean group, the evolution, trends and dynamics of the Winter-NAO is studied in detail. Bottum-up as well as top-down approaches were
used for evaluating the relationship between climate/weather anomalies as a result of the reconstructed NAO and the historical
climate/weather impact on human affairs and the history of culture.
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