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| Titel |
Reconstructing Holocene climate using a climate model: Model strategy and preliminary results |
| VerfasserIn |
K. Haberkorn, R. Blender, F. Lunkeit, K. Fraedrich |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027128
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| Zusammenfassung |
| An Earth system model of intermediate complexity (Planet Simulator; PlaSim) is used to
reconstruct Holocene climate based on proxy data. The Planet Simulator is a user friendly
general circulation model (GCM) suitable for palaeoclimate research. Its easy handling and
the modular structure allow for fast and problem dependent simulations. The spectral model
is based on the moist primitive equations conserving momentum, mass, energy and moisture.
Besides the atmospheric part, a mixed layer-ocean with sea ice and a land surface with
biosphere are included. The present-day climate of PlaSim, based on an AMIP II
control-run (T21/10L resolution), shows reasonable agreement with ERA-40 reanalysis
data.
Combining PlaSim with a socio-technological model (GLUES; DFG priority project
INTERDYNAMIK) provides improved knowledge on the shift from hunting-gathering to
agropastoral subsistence societies. This is achieved by a data assimilation approach,
incorporating proxy time series into PlaSim to initialize palaeoclimate simulations during the
Holocene. For this, the following strategy is applied: The sensitivities of the terrestrial PlaSim
climate are determined with respect to sea surface temperature (SST) anomalies. Here, the
focus is the impact of regionally varying SST both in the tropics and the Northern
Hemisphere mid-latitudes. The inverse of these sensitivities is used to determine
the SST conditions necessary for the nudging of land and coastal proxy climates.
Preliminary results indicate the potential, the uncertainty and the limitations of the
method. |
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