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| Titel |
Favorable conditions for Seasonal Footprinting Mechanism on ENSO |
| VerfasserIn |
Sang-wook Yeh, Jong-Yeon Park, Jong-Seong Kug, Jinhee Yoon |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250049140
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| Zusammenfassung |
| Previous studies have suggested that the wintertime sea surface temperature (SST) anomalies
in the North Pacific, which is generated by the concurrent North Pacific Oscillation (NPO),
are able to force the El Nino and Southern Oscillation (ENSO) in the following winter via the
so-called ‘seasonal footprinting mechanism” (SFM). We examine how the mid-latitude
atmospheric forcing, which is represented by the NPO, effectively generates the ENSO in the
following winter via the SFM in the observations. It is found that there exists a
favorable condition in which the spatial structure of NPO as well as associated
wind speed and net heat flux in the northeast Pacific is important. Using a linear
baroclinic model experiment, it is found that the La Niña-like SST anomalies centered
in the eastern tropical Pacific tend to make the NPO structure which is favorable
or unfavorable for the SFM. We emphasize that the position of La Nina-like SST
forcing in the previous winter is able to modify the structure of NPO, which provides
a favorable condition of the El Niño event in the following winter via the SFM. |
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