印度洋-太平洋海表温度异常的持续性特征

On the Characteristics of Sea Surface Temperature Anomalies Persistence in the Indian-Pacific Ocean

用Reynolds＆Smith重构的1950-1998年月平均SST资料分析了印度洋-太平洋海表温度距平SSTA的持续性特征。结果表明:SSTA的持续性在空间上分布不均匀,可将有明显差异的SSTA持续性特征的海区分为3类:全年各月持续性好的区域,主要包括热带中东太平洋马蹄形海域、赤道中东印度洋、热带西太平洋,持续时间一般在10个月以上;全年各月持续性差的区域,主要包括西北太平洋、东亚沿海和东南太平洋,持续时间一般为3个月左右;各月持续性有季节性变化的区域,主要包括赤道东太平洋,南海。SSTA持续性的整体空间分布存在冬夏两种主要分布型,夏季型SSTA的持续性要比冬季好。冬夏间SSTA持续性最明显的差异出现在赤道东太平洋和东亚沿海、南海区域,由冬季转入夏季时,赤道东太平洋SSTA的持续性由差变好,东亚沿海、南海地区的情况则与之相反。

Using Reynolds & Smith's reconstructed monthly SST data (1950-1998) , the characteristics of the sea surface temperature anomalies persistence (SSTAP) over the Indian-Pacific Ocean have been investigated. The results show that the lengths of SSTAP are various in the Indian-Pacific Ocean. The sea areas can be sorted into three different types, one is with good SSTAP in all seasons, including the equatorial central to eastern Indian ocean, the tropical western Pacific and the U-shape sea areas around the the equatorial central to eastern Pacific; the second with poor SSTAP in all seasons, including marine East Asian and the south-estaern Pacific; and the third with remarkable seasonal variation, including the South China Sea and the the equatorial eastern Pacific.The lengths of SSTAP in all three types also vary with seasons. The SSTAP in summer is better than that in winter in the equatorial eastern Pacific, but the reverse is found in the the South China Sea and the marine East Asian.