摘要:本文系统地回顾了作者近年来关于南海-热带西北太平洋地区大气和海洋季节内尺度变化关系方面的主要研究成果。文中对10~20天和30~60天两种季节内振荡海气变化关系的不同以及冬、夏季间的差异进行了系统地比较。相比较而言，大气中10~20天振荡所占比例大于30~60天振荡，海表温度30~60天的振荡在南海和西北太平洋副热带地区比10~20天振荡的贡献大，而在低纬度西太平洋地区10~20天振荡与30~60天振荡贡献相近或稍大。在北半球夏季，10~20天低频振荡的分布呈西南—东北走向，由赤道西太平洋地区向西北偏西方向传播，而30~60天低频振荡则以东西向分布为主，表现为由南向北的传播特征。在北半球冬季，10~20天和30~60天两种低频振荡的水平结构类似，均表现为西南—东北走向；同时，南海地区季节内变化信号表现出明显的向南传播的独特特征，并与东亚冬季风的季节内变化密切相关。北半球夏季，南海—菲律宾海地区10~20天低频振荡强度在厄尔尼诺发展年得到加强，而30~60天低频振荡强度则在拉尼娜衰减年得以加强。分析还指出，热带西北太平洋地区夏季热带辐合带附近的季节内变化，尤其是10~20天尺度变化，对季节平均海表温度异常有显著的反馈作用。
关键词:南海—热带西太平洋/
季节内尺度/
海气变化关系
Abstract:This paper reviews results of the authors' studies about the relationship of intraseasonal variations between atmosphere and ocean over the South China Sea and tropical western North Pacific during the recent several years. The review compares the difference of the relationship between the 10-20-day and 30-60-day time scale intraseasonal variations and that between winter and summer. It is found that the 10-20-day intraseasonal oscillations (ISOs) account for a larger part of the intraseasonal variance in the atmosphere compared to the 30-60-day ISOs, whereas the 30-60-day ISOs explain a larger part of the intraseasonal variance in sea surface temperature (SST) than the 10-20-day ISOs except over the low-latitude western North Pacific, where the contribution of 10-20-day ISOs is comparable to or slightly larger than that of 30-60-day ISOs. In the boreal summer, the 10-20-day ISOs display a distribution along the southwest-northeast direction and northwest-westward propagation from the equatorial western Pacific, whereas the 30-60-day ISOs display a west-east distribution and northward propagation. In the boreal winter, the two ISOs display a similar distribution featuring a southwest-northeast orientation. The ISOs display a unique southward propagation over the South China Sea during boreal winter and a close association with the intraseasonal variation of the East Asian winter monsoon. Over the South China Sea-Philippine Sea, the 10-20-day ISOs intensify during the El Ni?o developing summers, whereas the 30-60-day ISOs tend to enhance during the La Ni?a decaying summers. Further analysis reveals that the intraseasonal variations, particularly on the 10-20-day time scale, around the inter-tropical convergence zone over the tropical western North Pacific have a prominent feedback on seasonal mean SST anomalies in boreal summer.
Key words:South China Sea and tropical western North Pacific/
Intraseasonal variation/
Atmosphere-ocean relationship
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