Diagnosis of OLR Features of West Pacific Ocean Subtropical High Ridge Carried to 25°N

Based on the date of the West Pacific Ocean subtropical high ridge carried to 25° N and monthly mean OLR data, the index of the subtropical high ridge and anomalous years are defined. And OLR features of the anomalous years are revealed. The results are as follows: (1) when OLR anomaly arranges in low( high ), high( low ), low( high ) on June in East Asia from middle latitude to low latitude,it is easy that subtropical high ridge carried to 25°N early( late ) than normal. (2) when diagnosis and analysis are being made, particular attention should be paid both to the last November information of Australia in Southern Hemisphere and to the current March information of convergence region over West Pacific Ocean.

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