Details

Autor(en) / Beteiligte

• Hong, Chi-Cherng
• Chang, Tao-Chi
• Hsu, Huang-Hsiung

Titel

Enhanced relationship between the tropical Atlantic SST and the summertime western North Pacific subtropical high after the early 1980s

Ist Teil von

• Journal of geophysical research. Atmospheres, 2014-04, Vol.119 (7), p.3715-3722

Ort / Verlag

Washington: Blackwell Publishing Ltd

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The western North Pacific subtropical high (WNPSH) in boreal summer shows a remarkable enhancement after the early 1980s. Whereas the sea surface temperature (SST) in the North Indian Ocean (NIO) and the equatorial eastern Pacific had been noted to have remarkable local or remote effects on enhancing the WNPSH, the influence of the Atlantic SST, so far, is hardly explored. This article reports a new finding: enhanced relationship between the tropical Atlantic (TA)‐SST and the WNPSH after the early 1980s. Regression study suggests that the warm TA‐SST produced a zonally overturning circulation anomaly, with descending over the equatorial central Pacific and ascending over the tropical Atlantic/eastern Pacific. The anomalous descending over the equatorial central Pacific likely induced low‐level anticyclonic anomaly to the west and therefore enhanced the WNPSH. One implication of this new finding is for predictability. The well‐known “spring predictability barrier” (i.e., the influence of El Niño–Southern Oscillation (ENSO) falls dramatically during boreal spring) does not apply to the TA‐SST/WNPSH relationship. The TA‐SST shows consistently high correlation starting from boreal spring when the ENSO influence continues declining. The TA‐SST extends the predictability of the WNPSH in boreal summer approximately one season earlier to boreal spring. Key Points The relationship between the TA‐SST and the WNPSH was enhanced after the early 1980sThe ENSO's impact on the TA‐SST has been weakening since the early 1980sThe warm TA‐SST may improve the predictability of the boreal summertime WNPSH