THE RESEARCH OF ANTECEDENT SST SIGNAL TO EAST ASIA SUMMER MONSOON
HU Juan
YAN Hong-ming
ZHOU Jian-qin
Abstract：The NCEP/NCAR reanalysis data, Hadley Center sea surface temperature analysis data and precipitation records over East Asia monsoon region in China are used to examine the relationship between the sea surface temperature (SST) in the previous winter and the East Asia summer monsoon. The results show that the abnormal variations of SST in south India Ocean and eastern North Pacific are key areas infecting the East Asia summer monsoon. The SST in key areas is in highly positive correlation with precipitation over the middle reach of the Yangtze River, and significantly negative correlation with the summer monsoon index. Based on the research, an Indo-Pacific SST index was defined. In the years of strong SST index, the South Asia high, Somali cross-equatorial flow and the western Pacific subtropical high were all enhanced, which led to the advancement of the East Asia summer monsoon. Under the situation, the precipitation increased obviously in most of the East Asia monsoon region in China. The atmospheric circulation and the precipitation had opposite tendency in the years of weak SST index years.
Keywords：climatologystatistics analysisIndo-Pacific sea surface temperature indexEast Asia summer monsoonanomaly rainfall distributionhigh and low circulation configuration
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 401-409 )