TOGA COARE IOP期间西太平洋暖池海域的热状况

The thermal conditions of the Western Pacific Warm Pool during TOGA COARE IOP

利用 TOGA COARE IOP期间“向阳红五号”调查船在 2°S、 1 55°E附近进行的 3个航段的多项目综合性科学考察资料 ,对西太平洋暖池海域的热状况进行了分析。结果表明 ,在 TO-GA COARE IOP期间 ,西太平洋暖池海域的热状况具有 El Nino事件发生前的特征。对航段平均来说 ,暖池深度、海洋上层混合层深度和海面至 2 60 m水层的平均温度 ,均是逐航段递次减小的。这种 El Nino事件发生前的热状况特征是该海域海表盛行风向转为西风 ,东向流加强 ,暖水流失的结果。此外 ,在航段内各热状况要素也存在由局地海气耦合性变化造成的数天至十多天尺度的变化。

The variations of the thermal conditions of the Western Pacific Warm Pool (WP- WP) are analyzed using the data obtained from three comprehensive exploration cruises of R/V Xiangyanghong5 near2°S,15 5°E during TOGA COARE IOP.The resultshows that the thermal conditions of WPWP during the study period were consistentwith the features of the onset phase of El Nino event. On average of each cruise,the depth of the WPWP, the depth of upper mixed layer and the heat content in 0～ 2 6 0 m layer were decreased cruise by cruise.These features might be resulted from the direction change of prevaling sea surface wind from eastto westand the strengthaning of the surface layereastward cur- rent,causing eastward trasport of the surface warm water in the western tropical Pacific. Besides,the thermal conditions also presented a fluctuation with time scale of several days to more than ten days in every cruise caused by the variation of local sea- air coupling sys- tem.