摘要
应用NCEP再分析资料和中国降水资料,分析研究了对应南海强、弱夏季风的环流形势及其与之相应的中国东部的降水异常。其结果表明,由强、弱夏季风所引起的中国气候异常是完全不同(甚至反相)的。分析大气季节内振荡(ISO)的活动还表明,对应大气强(弱)南海夏季风,南海地区 850 hPa也有强(弱)大气 ISO;而强、弱南海夏季风环流(200 hPa和 850 hPa)主要由异常的大气ISO所激发。本研究还揭示了南海地区大气ISO的变化往往与江淮地区大气ISO的变化反相,例如南海地区的强(弱)大气ISO常与江淮流域的弱(强)大气ISO相对应。对于大气ISO的强度,一般多表现出局地激发特征,经向传播相对较弱。
The circulation pattern corresponding to the strong / weak summer monsoon in the South China Sea (SCS) region and the associated characteristics of the abnormal rainfall in Eastern China have been studied by using the NECP reanalysis data and precipitation data in China. The results show that the climate variations in China caused by the strong / weak summer monsoon are completely different (even in opposite phase). The analyses of atmospheric intraseasonal oscillation (ISO) activity showed that the atmospheric ISO at 850 hPa near the SCS region is strong (weak) corresponding to the strong (weak) SCS summer monsoon. And the analyses of the circulation pattern of the atmospheric ISO showed that the strong / weak SCS summer monsoon circulation (200 hPa and 850 hPa) result mainly from abnormal atmospheric ISO. This study also reveals that the atmospheric ISO variability in the South China Sea region is usually at opposite phase with one in the Jiang-huai River basin. For example, strong (weak) atmospheric ISO in the SCS region corresponds to the weak (strong) atmospheric ISO in the Jiang-huai River basin. As to the intensity of atmospheric ISO, it is generally exhibits the local exciting characteristics, the longitudinal propagation is weak. Key words The SCS summer monsoon - Atmospheric intraseasonal oscillation - Circulation pattern This was supported by National Key Basic Science Program in China (G1998040903) and State Key Project-SCSMEX.
基金
National Key Basic Science Program in China (G1998040903)
State KeyProject-SCSMEX.
关键词
南海夏季风
大气季节内振荡
环流形势(型)
The SCS summer monsoon
Atmospheric intraseasonal oscillation
Circulation pattern