| 降水对热带海表温度异常的邻域响应 II. 资料分析 |
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| 引用本文： | 吴国雄,孙凤英,王敬方,等.降水对热带海表温度异常的邻域响应 II. 资料分析[J].大气科学,1995,19(6):663-676. |
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| 作者姓名： | 吴国雄 孙凤英 王敬方 等 |
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| 作者单位： | 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京100080 |
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| 基金项目： | 本研究得到中国科学院“灾害性气候预测及其对农业年景和水资源调配的影响”项目及国家基础性研究重大关键项目“气候动力学和气候预测理论研究”的支持。 |
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| 摘 要： | 对最近10年海表温（SST）的分析表明，东赤道太平洋（EEP）及中赤道印度洋（CEI）的SST存在显著正相关。西赤道太平洋（WEP）及西北太平洋（WNP）的SST也存在相关。流场和降水分析表明，当低空流场存在对EEP正的SST异常响应时，也存在对CEI正的SST异常的响应。前者位置偏东，对我国天气无直接影响；后者导致南方少雨，江淮多雨。在WNP和WEP海区SST异常的共同强迫下，我国南海及西太平洋出现低空反气旋式环流。由于其位置偏南，异常雨带位于华南，使我国华南多雨，江淮少雨。本文还用最近38年的海温和降水资料对上述结果进行检验。资料分析证实了数值模拟的结果，即降水对热带海表温度异常的响应是一种邻域响应。
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| 关 键 词： | 邻域响应 旋转主分量(RPC)分析 |
Neibourhood Response of Rainfall to Tropical Sea Surface Temperature Anomalies. Part II: Data Analysis |
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| Wu Guoxiong,Sun Fengying,Wang Jingfang and et al.Neibourhood Response of Rainfall to Tropical Sea Surface Temperature Anomalies. Part II: Data Analysis[J].Chinese Journal of Atmospheric Sciences,1995,19(6):663-676. |
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| Authors: | Wu Guoxiong Sun Fengying Wang Jingfang and |
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| Abstract: | Analysis of SST data for the last ten years showes the existence of significantly positive correlation in the SST anomalies (SSTA) between the eastern equatorial Pacific (EEP) and central equatorial Indian (CEl) Ocean, and between the western equatorial Pacific (WEP) and North-west Pacific (WNP) Ocean. Analysis of the corresponding data of the lower tropospheric wind and precipitation shows that when there exists the response of these fields to the SSTA in EEP. there also concurrently exists the response to the SSTA in CEl. The former occurs mainly over the Pacific Ocean and has no direct impacts on the weather over China. The latter occurs over China and in the surrounding regions, leading to below-normal rainfall in South China and abovenormal rainfall along the reaches of the Yangtze River and Huaihe River. Results also show that, with the jointly effects of SSTA in WNP and WEP, an abnormal anticyclonic circulation in the lower troposphere is observed over the South China Sea and North-west Pacific. Since the anticyclone in such circumstances is located to the south of the coastline of South China, the abnormal rain belt is located over South China, and above-normal rainfall in South China and below-normal rainfall in the reaches of the Yangtze River are observed. These results have been confirmed by the data of SST and precipitation for the last 38 years. Data analysis thus supports the conclusions obtained from numerical experiments discussed in Pal.t l. i.e., the response of precipitation to tropical sea surface temperature anomalies is a kind of neighbourhood response. |
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| Keywords: | neighbourhood response rotated principle component (RPC) allalysis |
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