| 关于确定东亚夏季风强度指数的探讨 |
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| 引用本文： | 廉毅,沈柏竹,高枞亭.关于确定东亚夏季风强度指数的探讨[J].气象学报,2004,62(6):782-789. |
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| 作者姓名： | 廉毅 沈柏竹 高枞亭 |
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| 作者单位： | 吉林省气象科学研究所,长春,130062 |
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| 基金项目： | 国家自然科学基金项目 (4 0 2 75 0 19)，中国气象局科研重点项目“现代气候变化对吉林省西部荒漠化影响的监测和评估研究”，吉林省重点课题 (2 0 0 2 0 417,2 0 0 0 0 2 0 5 0 6,990 2 18) |
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| 摘 要： | 文中利用作者曾定义的东亚夏季风在中国东北地区 (12 2 .5°E ,4 0°N)的建立标准 ,根据相同的方法 ,分别计算了沿 112 .5 ,117.5 ,和 12 2 .5°E上 ,2 0°N及以北每隔 5个纬度东亚夏季风建立、持续和撤退时间 (候 ) ,将某年持续和多年平均持续候数相比的标准化值 ,定义为一种沿某一经圈上某一纬度的东亚夏季风强度指数ISMΦ,还分析了该指数与中国夏季降水量场和 5 0 0hPa高度场的相关。结果表明 :(1)沿 117.5°E经度上 ,东亚夏季风在 2 0 ,2 5 ,30 ,35 ,和 4 0°N建立的平均日期分别为 2 7.2 6 ,2 8.5 4 ,34.4 3,37.12和 37.6 5 (候 ) ,撤退平均日期分别为 5 4 .4 4 ,5 3.6 9,5 1.85 ,4 8和 4 6 .76 (候 ) ,其中 117.5°E ,2 0°N代表南海的中北部 ,文中确定的该区夏季风建立、撤退日期分别为 2 7.2 6 (候 )和 5 4 .4 4 (候 ) ,与国内学者公认的 5月 4候 (2 8候 )和 10月 1候 (5 5候 )相当吻合 ;(2 )沿 112 .5°E、117.5°E和12 2 .5°E的同一纬度上 ,东亚夏季风建立的平均日期并不相同 ,西边先于东边建立 ,每隔 5个经度 ,相差约 1～ 2候 ,而撤退的平均日期 (30°N及以北 )分布则相反 ,东边先撤退 ;(3)沿 117.5°E ,30°N和 35°N的ISMΦ和沿 12 2 .5°E ,4 0°N的ISMΦ均与中国华北和东北地区大部 7～
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| 关 键 词： | 东亚夏季风 指数 建立和撤退 中国夏季降水 |
| 收稿时间： | 9/3/2003 12:00:00 AM |
| 修稿时间： | 2003年9月3日 |
AN EXPLORATION ON THE DETERMINATION OF EAST ASIA SUMMER MONSOON INDEX |
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| Lian Yi,Shen Baizhu and Gao Zongting.AN EXPLORATION ON THE DETERMINATION OF EAST ASIA SUMMER MONSOON INDEX[J].Acta Meteorologica Sinica,2004,62(6):782-789. |
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| Authors: | Lian Yi Shen Baizhu and Gao Zongting |
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| Institution: | Jilin Meteorological Science Institute, Changchun 130062;Jilin Meteorological Science Institute, Changchun 130062;Jilin Meteorological Science Institute, Changchun 130062 |
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| Abstract: | In this paper,NCEP/NCAR 1948-2002 daily reanalysis data and monthly rain data in 151 stations archived in NCC were used to calculate the date of est ablishment and with drawal of East Asia summer monsoon at every 5 latitude (north of 20°N) along 112.5,117.5 and 122.5°E as well.The met hod is similar to the criterion of establishment and withdrawal of East Asia summer monsoon in Northeast China defined by us.Amean date pentad] map of est ablishment and withdraw al of East Asian summer monsoon is drawn,an index of East Asia summer monsoon at a certain latitude along a certain longitude,ISM,is defined,and its relationship with summer precipitation and 500 hP a height in China was calculated.the results indicate that:(1) The mean pen-tads of establishment of East Asia summer monsoon at 20,25,30,35 and 40°N along 117.5°E are 27.26,28.54,34.43,37.12 and 37.65 respectively,and the mean pentads of its with drawal are 54.44,53.69,51.85,48 and 46.76 respectively.The determined pentad of establishment of East Asia summer monsoon in north of South China Sea(117.5°E,20°N),is coincident with the 4th pentad in Mayrecog nized by China scholar.(2) The mean date of East Asia summer monsoon establishment at the same latitude is not the same along 112.5,117.5 and 122.5°E,early in east part and preceding 1-2 pentad every 5 longitude.But the mean date distribution of its withdrawal (30°N and north of it) is opposite,first withdrawal in eastpart. |
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| Keywords: | East Asian summer monsoon index Establishment and withdrawal China's summer precipitation |
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