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| Titel |
A linearly perturbed climatology to implement atmospheric feedbacks in an ocean-only model |
| VerfasserIn |
Andrea Cimatoribus, Sybren Drijfhout, Henk Dijkstra |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033980
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| Zusammenfassung |
| An atmosphere/ocean/sea–ice coupled general circulation model (Speedo/CLIO) is used to
compute a climatology with linear perturbations. The model is run with two different setups.
First, the statistical steady state of the model is recorded. In a second experiment, a collapse
of thermohaline circulation is induced with a freshwater perturbation in the north Atlantic.
Thermohaline circulation does not recover even after the release of the perturbation, and a
second steady state with no thermohaline circulation is attained. Using these two runs, the
perturbed climatology can be computed as linear regression on the local value of sea
surface temperature and on northern hemisphere average sea surface temperature
separately.
The climatology produced will be used in a fully implicit model to compute bifurcation
diagrams of thermohaline circulation. By including parts of the perturbed climatology,
regressed on sea surface temperature, we are able to include the effect of atmospheric
feedbacks. This approach enables to selectively choose which linear feedbacks are operating
at the surface of the ocean–only model, thus giving the opportunity to understand
which role is played by each physical process active at the air–ocean interface. |
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