Analyses of factors forming offshore SST anomaly(O-SSTA) in China seas

Based on the observations, the location and the strength of warm(cold) anomaly of SST in surnmer are conrolled mainly by the subtropical highs of atmosphere (typhoon track) on the off shore of the China seas. It may be considered for the physical causes that the factors forming O-SSTA include the dynamic respome of upper layer ocean on tbe strong atmospheric forcing and the shallow sea effects. The former consists of the entrainment, the detrainment, the Ekman pumping and the convergence of surface warm watet; the later the tidal mixing and higher absorptivity. The parameterized expressions and the significance estimations of each factor are shown. The differences of both forming mechanisms and forming time-scales between the warm anomaly and the cold one are also indicated with different forcing systems.