THE VARIATION AND PRECURSOR OF GUANGZHOU SPRING RAINFALL
THE VARIATION AND PRECURSOR OF GUANGZHOU SPRING RAINFALL
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DOI：
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发表时间：
2005
影响因子：
1.2
通讯作者：
Hao Li-sheng
中科院分区：
文献类型：
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作者：
Hao Li-sheng
广州春季降水主要表现为准两年的年际变化和30年的年代际变化，年代际时间尺度上处于弱降水期。前冬Nino 3海温异常通过北太平洋影响广州春季降水，前冬Nino 3海温异常通过北太平洋影响广州春季降水，前冬Nino 3海温异常通过北太平洋影响广州春季降水前冬Nino 3 SSTA为正值时，春季副高偏强偏向西，华南处于副高边缘的上升气流区，菲律宾以东的反气旋环流加强了对华南的水汽输送，广州春季降水偏多; Nino 3 SSTA为负值时，副高偏弱偏东，华南远离副高，处于下降气流区，菲律宾以东地区受低层气旋性环流控制，华南偏北风盛行，水汽向华南输送较弱，广州春季降水偏少，造成春旱。
Guangzhou spring rainfall mainly exhibits interannual variation of Quasi-biannual and interdecadal variation of 30 yrs,and is in the period of weak rainfall at interdecadal time scale.SST anomalies(SSTA) of Nino3 are the strongest precursor of Guangzhou spring rainfall.They have significant positive correlation from previous November and persist stably to April.Nino3 SSTA in the previous winter affects Guangzhou spring rainfall through North Pacific subtropical high and low wind in spring.When Nino3 SSTA is positive in the previous winter,spring subtropical high is intense and westward,South China is located in the area of ascending airflow at the edge of the subtropical high,and water vapor transporting to South China is intensified by anticyclone circulation to the east of the Philippines.So Guangzhou spring rainfall is heavy.When Nino3 SSTA is negative,the subtropical high is weak and eastward,South China is far away from the subtropical high and is located in the area of descending airflow,and water vapor transporting to South China is weak because low-level cyclonic circulation controls areas to the east of the Philippines and north wind prevails in South China.So Guangzhou spring rainfall is weak and spring drought is resulted.