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Thermal Contrast between the Middle-Latitude Asian Continent and Adjacent Ocean and Its Connection to the East Asian Summer Precipitation

ABSTRACT

To analyze the middle-to-lower-troposphere atmospheric thermal contrast between the middle latitude over the Asian continent and over its eastern adjacent ocean near Japan, an empirical orthogonal function (EOF) analysis of the 40-yr ECMWF Re-Analysis (ERA-40) data of the June-August (JJA) 500-hPa geopotential height over the Asia-Pacific area (10°-80°N, 60°-180°E) during 1958-2000 was done. It shows that the dominating pattern of the thermal contrast may well be represented by a "seesaw" of 500-hPa geopotential height anomalies between a land area (40°-55°N, 75°-90°E) and an oceanic area (35°-42.5°N, 140°-150°E). An index showing the difference between the two areas is ...

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