亚洲夏季风与福建汛期降水的关系分析

On the relation between Asian summer monsoon and rainfall in Fujian Province

采用EOF(Emprical Orthogonal Function)、小波分析和交叉小波分析等方法研究了福建省汛期降水的不同空间分布型在不同的时间尺度下与西北太平洋夏季风、印度洋夏季风的关系.结果表明:福建汛期降水空间分布以全省一致型和东南—西北反相型两种模态为主;西北太平洋夏季风主要影响福建整个汛期降水总量的多寡,当西太平洋夏季风较强(弱)时,福建整个汛期全省降水偏多(少);而印度洋夏季风则主要影响福建汛期降水量东南-西北向差异,即ISM强(弱),福建东南-西北部降水差异增大(减小).

With EOF, wavelet and cross wavelet techniques, the relations of the space patterns of rainfall during May-September over Fujian to NWP （northwest Pacific） and Indian-Ocean summer monsoons at a range of time scales were studied. It shows that 1 ） the rainfall is dominantly of two patterns, one being a type with no rainfall difference over the province and the other being a type of rainfall distributing opposite to the SE - NW direction; 2） the SCS monsoon acts as a dominant factor for homogeneous rainfall when SCS monsoon becomes stronger （weaker） and the precipitation during the whole rainy season is much （less） province-wide. When the Indian Ocean monsoon is responsible for the spatial distribution in this region, i. e. , ISM comes to stronger（ weaker）, the difference in rainfall increased（decreased） on areas between the NW and SE Fujian.