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| THE VARIATION OF THE SPRING PRECIPITATION IN GUANGZHOU AND ITS PRECURSORY SIGNALS | |
| 作者姓名： | 谷德军 纪忠萍 林爱兰 郝立生 |
| 作者单位： | Guangzhou Institute of Tropical and Marine Meteorology / Key Open Laboratory for Tropical Monsoon, CMA;Guangzhou Central Weather Observatory;Guangzhou Institute of Tropical and Marine Meteorology / Key Open Laboratory for Tropical Monsoon, CMA;Hengshui Meteorological Bureau of Hebei Province |
| 基金项目： | Research on the Technologies of Predicting Drought Prospects in Guangdong, a planned project for Guangdong Province (2005B32601007) |
| 摘 要： | 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. |
| 关 键 词： | Guangzhou spring rainfall spring drought precursor subtropical high low-level wind |
THE VARIATION OF THE SPRING PRECIPITATION IN GUANGZHOU AND ITS PRECURSORY SIGNALS |
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| GU De-jun,JI Zhong-ping,LIN Ai-lan and HAO Li-sheng.THE VARIATION OF THE SPRING PRECIPITATION IN GUANGZHOU AND ITS PRECURSORY SIGNALS[J].Journal of Tropical Meteorology,2006,12(2):121-129. | |
| Authors: | GU De-jun JI Zhong-ping LIN Ai-lan and HAO Li-sheng |
| Institution: | 1. Guangzhou Institute of Tropical and Marine Meteorology/Key Open Laboratory for Tropical Monsoon,CMA, Guangzhou 510080 China 2. Guangzhou Central Weather Observatory, Guangzhou 510080 China 3. Hengshui Meteorological Bureau of Hebei Province, Hengshui, 053000 China |
| Abstract: | 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. |
| Keywords: | Guangzhou spring rainfall spring drought precursor subtropical high low-level wind |
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