Open AccessPossible impact of the autumnal North Pacific SST and November AO on the East Asian winter temperature
Author(s) -
Kim HaeJeong,
Ahn JoongBae
Publication year - 2012
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2012jd017527
Subject(s) - climatology , east asia , environmental science , oceanography , geography , sea surface temperature , geology , china , archaeology
This study investigates the effects of the North Pacific sea surface temperature (NP SST) anomalies on the East Asian winter temperature (T EA ), and the relationship between the Arctic Oscillation (AO) and NP SST anomalies in association with T EA . Time‐lagged correlation analysis revealed that the third mode of the September–October–November (SON) mean NP SST (“SON SST 3rd mode”) and the AO index for November (“Nov AO”) are closely related to T EA , and further that the first and second modes of NP SST are associated with the Pacific Decadal Oscillation (PDO) and Pacific North America (PNA) patterns, respectively. This study reveals that when the SON SST 3rd mode and Nov AO have a positive (negative) phase, the intensity of the Siberian High weakens (strengthens), which in turn weakens (strengthens) the East Asian winter monsoon (EAWM), resulting in a warm (cold) winter in East Asia. Our results suggest that the North Pacific Ocean signals influence the AO, which is one of the most pronounced Northern Hemispheric atmospheric global patterns. Such an influence in turn governs the continental‐scale circulation over Siberia and affects the subsequent local climate variation over the East Asia regions.