Klimaforskning - hjemmeside
Startet av Okular, mars 24, 2012, 13:29:53 PM
Sitat fra: Okular på mars 24, 2012, 13:29:53 PMP.S.: La dere nå ikke provosere av min tilsynelatende skråsikkerhet . Den er kun ment som et fortellergrep. Plukk den for all del fra hverandre.Mer seinere, altså ...
SitatThe Walker and Hadley circulations can serve as a "tropospheric bridge" for transferring the Pacific El Niño SST anomalies to the Atlantic sector and inducing the TNA [Tropical North Atlantic] SST anomalies just at the time of year when the warm pool is developing. As the Pacific El Niño warming culminates near the end of the calendar year, an alteration of the low latitude direct circulation occurs, featuring (1) an anomalous weakening of the convection over northern South America, (2) Walker circulation anomalies along the equatorial strip to the east and west, and (3) a weakened northward Hadley flow aloft. The Hadley weakening results in less subsidence over the subtropical North Atlantic, an associated breakdown of the anticyclone, and a weakening of the NE trades in the TNA.
SitatThe warming during a La Niña [sikter til La Niña 2 i kjeden over] is direct for the East Indian and West Pacific Oceans. During a La Niña, 'leftover' warm water from the El Niño is pushed to the west and carried to the higher latitudes by the western boundary currents. And some works its way into the Indonesian Throughflow and on into the East Indian Ocean. Also, during the La Niña, the strengthened trade winds shift cloud cover to the west, allowing more downward shortwave radiation to heat the tropical Pacific ocean, and like the 'leftover' warm water, it is carried to the Kuroshio Extension, the SPCZ, and the eastern tropical Indian Ocean.