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Abstract:
The 850 hPa wind field data from NCEP and OLR data are used to study the variation behavior of the southwesterly wind and OLR in the South China Sea and their mutual relationship. A monsoon index is putforward that reflects the variation of the southwest monsoon in the region. In the preliminary study or intensity variation and establishment time of the monsoon, it is found that it is of dual peaks on the seasonal scale and the interannual variation of the monsoon intensity and the establishment time are related with sea surface temperature. The summer monsoon is established earlier and with higher intensity in the EI Niño year and vice versa.
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