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Abstract:
The work is a general survey using SSTA data of the Indian Ocean and of precipitation at 160 Chinese weather stations over 1951 ~ 1997 (47 years). It reveals that the dipole oscillation of SST, especially the dipole index of March ~ May, in the eastern and western parts of the ocean correlates well with the precipitation during the June ~ August raining season in China. As shown in analysis of 500-hPa Northern Hemisphere geopotential height height by NCEP for 1958 ~ 1995, the Indian Ocean dipole index (IODI) is closely related with geopotential height anomalies in the middle- and higher- latitudes in the Eurasian region. As a negative phase year of IODI corresponds to significant Pacific-Japan (PJ) wavetrain, it is highly likely that the SST for the dipole may affect the precipitation in China through the wavetrain. Additionally, correlation analysis of links between SST dipole index of the Indian Ocean region and air temperature in China also shows good correlation between the former and wintertime temperature in southern China.
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