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| Titel |
Global atmospheric response to specific linear combinations of the main SST modes. Part I: numerical experiments and preliminary results |
| VerfasserIn |
S. Trzaska, V. Moron, B. Fontaine |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 10 ; Nr. 14, no. 10, S.1066-1077 |
| Datensatznummer |
250012431
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| Publikation (Nr.) |
 copernicus.org/angeo-14-1066-1996.pdf |
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| Zusammenfassung |
| This article investigates through numerical
experiments the controversial question of the impact of El Niño-Southern
Oscillation (ENSO) phenomena on climate according to large-scale and
regional-scale interhemispheric thermal contrast. Eight experiments (two
considering only inversed Atlantic thermal anomalies and six combining ENSO warm
phase with large-scale interhemispheric contrast and Atlantic anomaly patterns)
were performed with the Météo-France atmospheric general circulation model.
The definition of boundary conditions from observed composites and principal
components is presented and preliminary results concerning the month of August,
especially over West Africa and the equatorial Atlantic are discussed. Results
are coherent with observations and show that interhemispheric and regional scale
sea-surface-temperature anomaly (SST) patterns could significantly modulate the
impact of ENSO phenomena: the impact of warm-phase ENSO, relative to the
atmospheric model intercomparison project (AMIP) climatology, seems stronger
when embedded in global and regional SSTA patterns representative of the
post-1970 conditions [i.e. with temperatures warmer (colder) than the long-term
mean in the southern hemisphere (northern hemisphere)]. Atlantic SSTAs may also
play a significant role. |
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