 |
| Titel |
Simulating Southern Hemisphere extra-tropical climate variability with an idealised coupled atmosphere-ocean model |
| VerfasserIn |
H. Kurzke, M. V. Kurgansky, K. Dethloff, D. Handorf, S. Erxleben, D. Olbers, C. Eden, M. Sempf |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1991-959X
|
| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 5 ; Nr. 5, no. 5 (2012-09-19), S.1161-1175 |
| Datensatznummer |
250002847
|
| Publikation (Nr.) |
 copernicus.org/gmd-5-1161-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| A quasi-geostrophic model of Southern Hemisphere's wintertime
atmospheric circulation with horizontal resolution T21 has been coupled to
a global ocean circulation model with a resolution of 2° × 2° and
simplified physics. This simplified coupled model reproduces qualitatively some features of the
first and the second EOF of atmospheric 833 hPa geopotential height in
accordance with NCEP data. The variability patterns of the simplified coupled model
have been compared with variability patterns simulated by four complex state-of-the-art coupled CMIP5 models.
The first EOF of the simplified model is too zonal and does not reproduce the right position of the centre of action over the Pacific Ocean and
its extension to the tropics. The agreement in the second EOF between the simplified and the CMIP5 models is
better.
The total variance of the simplified model is weaker than the observational variance and those of the CMIP5 models.
The transport properties of the Southern Ocean circulation are in qualitative accord with observations.
The simplified model exhibits skill in reproducing essential features of decadal
and multi-decadal climate variability in the extratropical Southern Hemisphere. Notably, 800 yr long coupled model simulations reveal sea
surface temperature fluctuations on the timescale of several decades in the
Antarctic Circumpolar Current region. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|