季节—年际历史回报数据中北大西洋海温异常影响东亚气候的两种途径OACSTPCD

By using the monthly mean Sea Surface Temperature(SST),near surface air temperature,precipitation,wind and geopotential height data of the ENSEMBLES and Coupled Seasonal Forecasts of the 20th Century(CSF-20C)seasonal-annual hindcasts from 1980 to 2005,two pathways of the impact of North Atlantic SSTA on East Asian climate were studied.Results show that the tropical North Atlantic SSTAs are coupled closely with the southwest wind anomaly in spring and summer,with the warming center strengthening and moving westward.The SST warming stimulates the eastward Kelvin wave,which causes the significant enhancement of the western North Pacific anticyclone in summer,and increases the precipitation in northern Indo-China Peninsula,southern Japan and most of southern China.However,the SSTAs of mid-high latitude North Atlantic exhibit a dipole in spring,with SST warming in the northeast and cooling in the southwest.The SSTA stimulates the teleconnection wave through the strong coupling with the wind,affecting the Ural Blocking High and East Asian trough,which causes a low pressure anomaly in Northeast Asia,and promotes a decrease in air temperature over the Korean Peninsula,Japan and eastern China.