| 南印度洋副热带偶极子型海温异常与全球环流和我国降水变化的关系 |
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| 引用本文： | 杨秋明.南印度洋副热带偶极子型海温异常与全球环流和我国降水变化的关系[J].海洋学报,2006,28(3):47-56. |
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| 作者姓名： | 杨秋明 |
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| 作者单位： | 江苏省气象科学研究所, 江苏, 南京, 210008 |
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| 摘 要： | 用1951~2001年观测资料,研究了南印度洋副热带偶极子型(IOSD)海温异常对全球500hPa环流和我国降水的影响.结果表明,冬季IOSD激发出极显著的南北半球环绕太平洋的波列结构(CP),其年际变化周期是2.0和6.5 a,与赤道中东太平洋海温也有密切联系.北半球冬季异常峰值后的第二年春季欧亚中高纬度地区500 hPa环流出现显著的EUP型低频流型持续异常,同时中太平洋和北美地区出现CPNP流型和澳大利亚南部的南半球中高纬地区呈现极显著的西南太平洋遥相关型(SWP).当冬季赤道南印度洋副热带呈极显著的西负东正海温距平分布时,后期春季欧亚中高纬地区负EUP型遥相关波列持续偏强,导致东亚大槽明显偏弱,长江以北地区(特别是黄河中上游地区)多雨.反之,春季东亚大槽加强且稳定,我国东部地区大范围少雨.它反映了南印度洋地区海气系统相互作用与东亚热带内外环流低频变化的联系.因此,上一年冬季南印度洋副热带偶极子型(IOSD)海温异常强度是预测春季华北地区旱涝变化的重要因子之一.
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| 关 键 词： | 南印度洋海温偶极子型(IOSD) 全球环流 CP型 SWP型 中国降水 |
| 文章编号： | 0253-4193（2006）03-047-10 |
| 收稿时间： | 12 8 2005 12:00AM |
| 修稿时间： | 2005-12-082006-04-10 |
Indian Ocean subtropical dipole and variations of global circulations and rainfall in China |
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| YANG Qiu-ming.Indian Ocean subtropical dipole and variations of global circulations and rainfall in China[J].Acta Oceanologica Sinica (in Chinese),2006,28(3):47-56. |
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| Authors: | YANG Qiu-ming |
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| Institution: | Jiangsu Meteorological Institute, Nanjing 210008, China |
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| Abstract: | Based on the observed data during the period of 1951~2001,the effects of the subtropical dipole of SST in the southern Indian Ocean(IOSD)on the global 500 hPa circulations and the rainfall in China are investigated.Results show that the low frequency wavetrain of circum-Pacific pattern(CP)exists over Pacific Ocean for the extreme phase of IOSD in the Northern Hemisphere winter,in which the main periods are about 2.0 and 6.5 a,and is closely linked to SST in the equatorial central and eastern Pacific.The Eurasian Pacific pattern(EUP)and the central Pacific/the North Pole(CPNP)wavet rain in the Northern Hemisphere and southwestern Pacifict eleconnection pattern(SWP)in the Southern Hemisphere are dominant for the following spring.When there is a pattern with west negative and east positive in the subt ropical southern Indian Ocean in winter,the negative EUP pattern is stronger during the next spring,leading to a weak trough in eastern Asia and plenty rainfall in north of Changjiang River Valley,in particular the upper and middle reaches of Huanghe River Valley.Conversely,the stronger and stable trough in East Asia,resulting in the rare rainfall in east China.It is reflected the connections between the interactions of air-ocean system in the southern Indian ocean and low frequency variations in the tropical and extratropical eastern Asia.Thus,the intensity of IOSD in the Northern Hemisphere winter is considered as one of the main factor for the predicting of the rainfall in the north of China in the following spring. |
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| Keywords: | Indian Ocean subtropical dipole(IOSD) global circulations circum-Pacific pattern(CP) southwestern Pacific pattern(SWP) rainfall in China |
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