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| 江南汛期降水基本气候特征及其与海温异常关系初探 |
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陈绍东1,2, 王谦谦2, 钱永甫3
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1.广东省气象局, 广东, 广州, 510080;2.南京气象学院KLME, 江苏, 南京, 210044;3.南京大学大气科学系, 江苏, 南京, 210093
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| 摘要: |
| 分析了江南汛期降水异常的基本气候特征。指出:雨季开始于3月,雨量集中于春末夏初(4～6月),是中国东部雨季开始和结束均最早的地区。江南汛期降水近50年来略有减少的趋势。影响江南汛期降水的海温异常关键区位于9～1°S,121～129°E,关键影响时段为前一年的5～7月。长时间的海气相互作用使前期的海温异常影响了后期的大气环流,导致江南地区次年汛期的降水异常。 |
| 关键词: 江南汛期降水异常 海温异常 相关分析 |
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| 基金项目:国家自然科学基金重点基金项目"江淮梅雨年际和年代际变化规律及其机制研究(40233037);国家自然科学基金项目"南亚高压和亚洲季风相互作用及其机理研究"(40175021) |
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| PRELIMINARY DISCUSSIONS OF BASIC CLIMATIC CHARACTERISTICS OF PRECIPITATION DURING RAINING SEASONS IN REGIONS SOUTH OF CHANGJIANG RIVER AND ITS RELATIONSHIP WITH SST ANOMALIES |
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CHEN Shao-dong1,2, WANG Qian-qian2, QIAN Yong-fu3
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1.Guangdong Meteorological Bureau, Guangzhou 510080, China;2.Nanjing Institute of Meteorology, KLME, Nanjing 210044, China;3.Department of Atmospheric Sciences, Nanjing University, Nanjing 210093, China
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| Abstract: |
| Basic climatic characteristics are analyzed concerning the precipitation anomalies in raining seasons over regions south of the Changjiang River (the Yangtze). It finds that the regions are the earliest in eastern China where raining seasons begin and end. Preeipitation there tends to decrease over the past 50 years. Waters bounded by 9～1°S,121～129°E are the key zones of SST anomalies that affect the precipitation in these regions over May～July in preceding years. Long-term air-sea interactions make it possible for preceding SST anomalies to affect the general circulation that come afterwards,causing precipitation anomalies in the raining seasons in regions south of the Changjiang River in subsequent years. |
| Key words: precipitation anomalies in raining seasons of regions south of Changjiang River SST anomalies correlation analysis |