不同资料揭示南海夏季风爆发特征的比较

利用全球月平均海温资料，近地面的风、气温、湿度资料，以及海表感热和潜热资料，在综合分析海温和气象要素变化的基础上，确定了7个全球海气相互作用的关键区，并运用相关分析法，着重分析了各关键海区上空气象要素场与海温的时滞相关，以揭示不同关键海区海气相互作用的异同。分析表明：不同海区海气热力相互作用较强，海温与气温比湿有较好的互代性，特别是中东太平洋和南印度洋海区。动力作用对海温的影响各海区差异较大，中西太平洋海区的动力影响可能更关键。在感热潜热与海温的相关中，东西太平洋海区和西北太平洋及南印度洋两季风区都较关键。通过分析各海区海温和各气象要素相邻月的持续相关概率，进一步了解哪些要素、哪些区在哪些时段其异常持续性好，或异常持续性容易发生破坏，这不仅对做预报有一定的参考价值，也为我们讨论海气相互作用的物理机制提供了依据。

COMPARISION OF THE SCS SUMMER MONSOON ONSET-CHARACTERISTICS DERIVED FROM DIFFERENT DATASETS

In this study,the basic characteristics of South China Sea (CSC) summer monsoon onset are analyzed and compared using different datasets. Those include the Climate Prediction Center (CPC) Merged Analysis of Precipitation (CMAP),National Meteorological Center global wind analysis,outgoing longwave radiation (OLR),and upper-tropospheric water vapor band brightness temperature (BT) observed with NOAA polar orbiting satellites. Results show that the BT can reflect some characteristics of SCS monsoon onset but it can not well depict the some information of local precipitation more details. OLR can reflect well the precipitation that lied over oceans but the low OLR over lands may be influenced by low surface temperature. 850 hPa wind alone can not determine the onset of summer monsoon. For describing the onset of SCS summer monsoon,the domain of SCS is reasonable to be determined in central-north part of SCS because the annual precipitation and convection continue to appear in the south part of SCS for the whole year. After the onset of SCS summer monsoon,southwesterly monsoon flow and monsoon rainbelt prevail from Indian Ocean through Bay of Bengal and SCS to northwest Pacific which is a mark of summer monsoon onset over both South Asia and East Asia.