The Interdecadal Change Of Wintertime Climate Over East Asia | 55545
Journal of Earth Science & Climatic Change
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The interdecadal change of the relationship between the winter mean surface air temperature (SAT) over East Asia (EA) and
El Nino-Southern Oscillation (ENSO) is investigated using both observational data and a simple general circulation model.
A positive phase of the first empirical orthogonal function (EOF) mode of the SAT (SAT-EOF1) over EA is characterized by
significant warming over the mid- to high-latitude EA and is linked to the Arctic Oscillation (AO). The second EOF mode
(SAT-EOF2) is represented by a significant cooling extending from 55o N to the tropics and an abnormal warming over the
high-latitude EA. Focus is given to SAT-EOF2 which has a close relationship to a La Nina type sea surface temperature (SST)
anomalies. A clear climate shift of SAT-EOF2 is observed in the mid-1980s. The relationship between SAT-EOF2 and ENSO in
two subperiods, i.e., 1957 to 1982 (P1) and 1986 to 2010 (P2), are discussed and compared. Results showed that the relationship
between SAT-EOF2 and ENSO is significantly increased after mid-1980s. This is due to stronger SST and precipitation
anomalies in the tropical western Pacific associated with ENSO in P2 than in P1. In the mid-latitudes, the Pacific-North
American (PNA) teleconnection pattern is more closely related to ENSO in P2, while in P1 the ENSO-related atmospheric
circulation anomalies are more similar to a zonally orientated teleconnection pattern. Numerical experiments suggest that
the difference in the ENSO-related circulation anomaly in the mid-latitudes is likely related to the difference in climatological
mean flow of these two periods.
XiaoJing Jia has completed her PhD from McGill University and Post-doctoral studies from McGill University Department of Atmospheric and Oceanic Sciences. She is currently working as Professor at ZheJing University. She has published more than 15 papers in highly reputed journals.