Australia's High-voltage Inter-annual Changes In The Circulation System Of The Asian-australian Monsoon Anomalies

The interannual variaton of Australian High(AH) and its effect on the Asia-Australia monsoon circulation system(AAMCS) during 1948-2002 are analyzed, based on the data reanalyzed by NCEP/NCAR and the rainfall data of the 160 stations in China,The main results are below.(1) The Australian High(AH) bears clear interannual and interdecadal variation. Its interannual variation's main period is about 4~5a and the 7~8a's period exist too; The interdecadal variation's main period of the Australian High is about 15a. The interannual variation of Australian High(AAH) has correct correlation with Antarctic Oscillation and ENSO,and the ENSO's 4a period has the most important influence on the AAH.(2) When the AH becomes stronger,the members of the whole AAMCS are stronger following it.That is to say, in the years that the AH is stronger(compared to the weak years of AH) and on the horizontal circulation, the members of AAMCS,including the AH,the cross-equator flow(CEF) between 100 and 160 E,the south China sea south-west monsoom(SSM),the south sea monsoon rough,the tropical easily flow,subtropical high(SH),the mei-yu front,the mid-latitude effect,become stronger,and their positions are more southward; In the meridional-right circulation, there are five circulations including classic monsoon meridional-cirle circulation and Hadley circulation that become stronger in the strong years of AH than in the weak years of AH.(3) When the AH encournter the inter-annual variation,the anomaly of the raining in the area of Asia-Australia has some characters as follows: the main raining bands is distributed in these two areas: the area that is from the south of Changjiang,crossing the south of Japan's peninsula,to the west-northward Pacfic(aroud 30 N),and the area that is in the surface of tropical ocean of the north-hemisphere(aroud 10 N).In the years of stronger AH,the raining in these two area is more compared to the years of the weaker AH.(4) The anomaly of the SSMCS has better durative when the AH encourter niter-annual variation,and in the inter-decadal scale,when the AH occurs the inter-annual variation,the anomaly of the CEF between 100 and 160 E on 925hPa,the strength and area of SH has better durative,the durative of the CEF's anomaly on 200hPa.