热带太平洋混合层深度的年际异常及其与中国夏季降水关系分析被引量：4

THE ANALYSIS ON THE INTERANNUAL ANOMALY OF THE MIXED LAYER DEPTH OVER THE TROPICAL PACIFIC AND ITS RELATIONSHIP WITH THE PRECIPITATION OF CHINA IN SUMMER

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摘要利用Godas的逐月混合层深度(MLD)和中国160站逐月降水资料,分析热带太平洋混合层深度的季节变化及年际异常特征,初步探讨混合层深度异常与中国夏季降水异常的相关关系。结果表明:(1)赤道地区,东太平洋区域混合层最浅,中太平洋区域最深,且北半球秋冬季混合层比春夏季深;热带西北和西南太平洋在冬半球混合层深,夏半球浅。(2)赤道中、西太平洋混合层深度的年际异常终年都为大值区,北半球春(秋)季的热带西北太平洋(西南太平洋)也为年际异常大值区;7月年际异常最弱。(3)1、4和10月热带太平洋混合层深度年际异常与ENSO事件关系密切,在El Nio事件期间,热带太平洋东部及东北部混合层深度加深,西部及西南部减小。(4)热带太平洋混合层深度异常与中国夏季降水异常关系密切,这一关系也反映了El Nio事件与中国夏季降水的关系。即当秋冬季节发生El Nio事件时,来年El Nio事件衰减期的夏季长江中下游以南特别是洞庭湖、鄱阳湖的降水将显著偏多,江淮、华南南部降水偏少。 By using Godas monthly mixed layer depth（MLD） and 160-station monthly precipitation data in China,the seasonal and interannual characteristics of mld are analyzed over the tropical Pacific.The relationships between mld and summer rainfall are discussed with correlation method.The results show that：（1） MLD is the shallowest in the east part and the deepest in the central part for the equatorial Pacific.The mld is deeper in boreal fall and winter than in spring and summer.The mld is deeper in winter hemisphere and shallower in summer hemisphere over the northwest and southwest Pacific.（2） The interannual anomalies of mld is obvious in western and central equatorial Pacific throughout the year,and also noticeable over the tropical northwest Pacific（southwest Pacific） in spring（autumn）.（3） The interannual anomalies of mld in the tropical Pacific are closely related with ENSO events in January,April and October.During the El Nio events,the mld is deepened in the eastern and northeast part of the tropical Pacific,and shallowed in the western and southwest Parts.（4） There is closely correlation relationship between the tropical Pacific mixed layer depth anomalies and summer rainfall anomalies in China,which also reflects the relationship between El Nio events and summer rainfall in China.That is,when El Nio event occurs in autumn and winter,the precipitation will significantly be more than normal over the south of the Yangtze River,especially south of,Dongting Lake and Poyang Lake,and less than normal over the southern South China in the coming year summer when is the decay period of the El Nio.

作者李丽平靳莉莉王超黄滟

机构地区教育部省部共建重点实验室/南京信息工程大学大气科学学院

出处《热带气象学报》 CSCD 北大核心 2010年第6期659-666,共8页 Journal of Tropical Meteorology

基金国家科技支撑计划项目(2007BAC29B02) 公益性行业(气象)科研专项(GYHY201006038) 国家自然科学基金主任基金项目(40940008)共同资助

关键词热带太平洋混合层深度年际异常中国夏季降水 tropical Pacific Ocean mixed layer depth Interannual anomalies summer rainfall of China

分类号 P426.6 [天文地球—大气科学及气象学]

作者简介李丽平，女，山西省人，副教授，博士，主要从事区域气候和海陆气相互作用、低频振荡的研究。E-mail：liliping@nuist．edu．cn