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《Chinese Journal of Atmospheric Sciences》 2005-04
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The Influence of Wintertime Thermal Contrast over the Asian Continent on Asian Monsoon

YAN Hong-Ming 1,2, QI Ming-Hui 1, XIAO Zi-Niu 3, and CHEN Yan 11 Meteorological Sciences Institute of Yunnan Province, Kunming 650034 2 Institute of Atmospheric Physics,Chinese Academy of Sciences, Beijing 100029 3 Meteorological Administration of Yunnan Province, Kunming 650034  
Anomalous variations of wintertime surface air temperature (WSAT) over the Asian continent and the relationship between WSAT and Asian winter monsoon are first examined by using empirical orthogonal function (EOF) and correlation analysis. Both the second EOF pattern and correlation distribution exhibit that WSAT anomaly over Northeast Asia is opposite to that over South Asia, and this variation is closely associated with Asian summer monsoon activities. Thus, two regionally averaged WSATs over South Asia(15°N30°N, 75°E100°E) and Northeast Asia (30°N50°N, 100°E130°E) are chosen respectively and thermal contrast index is defined as the difference of WSAT between two regions. The opposite interdecadal variation is found in this index anomaly. It is positive during the 1950s and 1960s, but negative since the mid1970s. Based on above two different interdecadal timescale stages, the anomalous variations of general circulation and climate in summer over the Northern hemisphere are further investigated. The results show that their variations also have distinct interdecadal features. During positive index times, a strong summer monsoon tends to occur, the 500 hPa height over mid- and high-latitude regions is higher than that over low-latitude regions and East Asian trough weakens, the summer rainfall regions are located northward in the Yellow River valley, which result in less precipitation in the Huaihe River valley. On the contrary, during negative index times, a weak summer monsoon tends to occur, the 500 hPa height over mid- and high-latitude regions is lower than that over low-latitude regions and East Asian trough deepens, the summer rainfall regions are located southward in the Huaihe River valley. As for air temperature anomaly of 100010 hPa over East Asia and Northeast Asia areas, the variations are more complex. It includes not only interdecadal feature, but also distinct seasonal feature, especially in the troposphere. In the meantime, the studies also show that the previous WSAT has a strong impact on!the variation of sea surface temperature (SST) and convection activities in next spring and summer over the tropical regions.
【Fund】: 云南省科学基金2002D0082M;; 云南省气象局青年基金YQ200106
【CateGory Index】: P425.42
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