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| Titel |
Statistics of locally coupled ocean and atmosphere intraseasonal anomalies in Reanalysis and AMIP data |
| VerfasserIn |
M. Peña, E. Kalnay, M. Cai |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 10, no. 3 ; Nr. 10, no. 3, S.245-251 |
| Datensatznummer |
250007993
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| Publikation (Nr.) |
 copernicus.org/npg-10-245-2003.pdf |
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| Zusammenfassung |
| We apply a simple
dynamical rule to determine the dominant forcing direction in locally
coupled ocean-atmosphere anomalies in the National Centers for
Environmental Prediction/National Center for Atmospheric Research (NCEP/
NCAR) reanalysis data. The rule takes into account the phase relationship
between the low-level vorticity anomalies and the Sea Surface Temperature
(SST) anomalies. Analysis of the frequency of persistent coupled anomalies
for five-day average data shows that, in general, the ocean tends to force
the atmosphere in the tropics while the atmosphere tends to force the
ocean in the extratropics. The results agree well with those obtained
independently using lagged correlations between atmospheric and oceanic
variables, suggesting that the dynamical rule is generally valid. A
similar procedure carried out using data from the NCEP global model run
with prescribed SST (in which the coupling is one-way, with the ocean
always forcing the atmosphere) produces fewer coupled anomalies in the
extratropics. They indicate, not surprisingly, an increase in
ocean-driving anomalies in the model. In addition, and very importantly,
there is a strong reduction of persistent atmosphere-driving anomalies,
indicating that the one-way interaction of the ocean in the model run may
provide a spurious negative feedback that damps atmospheric anomalies
faster than observed. |
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