| 中国东部夏季降水准两年振荡空间分布及背景场特征 |
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| 引用本文： | 贾建颖,王永,孙照渤,刘毅,陈海山.中国东部夏季降水准两年振荡空间分布及背景场特征[J].地球物理学报,2010,53(10):2300-2309. |
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| 作者姓名： | 贾建颖 王永 孙照渤 刘毅 陈海山 |
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| 作者单位： | 1. 南京信息工程大学大气科学学院,气象灾害省部共建教育部重点实验室,南京 210044;
2. 中国科学院大气物理研究所中层大气和全球环境探测重点实验室,北京 100029;
3. 中国科学院研究生院,北京 100049 |
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| 基金项目： | 气象灾害省部共建教育部重点实验室(南京信息工程大学)开放课题,江苏省气象灾害重点实验室项目,江苏省"六大人才高峰"计划资助项目和科技部基础性工作专项重点项目 |
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| 摘 要： | 本文采用经验正交函数展开(EOF)及相关分析等方法,使用中国气象局整编的160站1951~2005年月平均降水资料和NCEP/NCAR再分析资料研究了中国东部夏季降水准两年周期振荡的空间模态及其大气环流背景场.结果表明:(1)中国地区降水季节性差异明显,夏季是主要的降水期并具有明显的准两年周期振荡(TBO)特征,中国东部地区是降水TBO方差变化最大的区域.(2)中国东部夏季降水TBO存在两个主要的空间模态,第1模态以27°N为界南北成反位相的变化关系,降水振幅较大;第2模态降水振幅相对较小,大值中心位于河套-华北地区.(3)形成中国东部夏季降水TBO的两个主要空间模态环流背景场明显不同.第1模态与西太平洋海温成正相关,与东太平洋海温成负相关.第2模态则主要与日本海附近的海温成正相关.当夏季降水TBO以江淮偏多时(第1模态),西太平洋海温偏高,东太平洋海温偏低,中国东部及沿海上空850 hPa有异常反气旋,500 hPa高度相关场东亚上空呈"正负正"波列特征,200 hPa南亚高压加强,西风急流位置偏南.当夏季降水TBO降水位置偏北时(第2模态),中国东部及沿海上空有异常气旋,200 hPa南亚高压偏弱,西风急流位置偏北.
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| 关 键 词： | 夏季降水 对流层准两年振荡 时空分布 环流 海温 |
| 收稿时间： | 2009-06-11 |
Leading spatial patterns of summer rainfall quasi-biennial oscillation and characteristics of meteorological backgrounds over eastern China |
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| JIA Jian-Ying,WANG Yong,SUN Zhao-Bo,LIU Yi,CHEN Hai-Shan.Leading spatial patterns of summer rainfall quasi-biennial oscillation and characteristics of meteorological backgrounds over eastern China[J].Chinese Journal of Geophysics,2010,53(10):2300-2309. |
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| Authors: | JIA Jian-Ying WANG Yong SUN Zhao-Bo LIU Yi CHEN Hai-Shan |
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| Institution: | 1. Key Laboratory of Meteorological Disaster of Ministry of Education (KLME) & Department of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Key Laboratory of Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;
3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | In virtue of empirical orthogonal function (EOF) analysis and correlation analysis etc., the leading spatial patterns of summer rainfall quasi-biennial oscillation (TBO) and the meteorological backgrounds are analyzed using monthly mean rainfall of China from 160 stations during the year of 1951~2005 from China Meteorological Administration and NCEP/NCAR reanalysis datasets. The following are main results: (1) The seasonal variation of rainfall is significant over China and summer is the main stage of rainfall. Summer rainfall has noticeable tropospheric quasi-biennial oscillation (TBO) character and the eastern China has the maximum rainfall TBO variance. (2) The summer rainfall TBO has two leading EOF spatial modes over eastern China, the first mode reflects the reverse phase of rainfall evolution between south and north of 27°N and the rainfall amplitude is relatively larger than the second mode. The max value center of the second mode located at Hetao and North China. (3)The meteorological backgrounds that form the two modes are different. The first mode has positive correlation with west Pacific sea surface temperature anomaly (SSTA) and negative correlation with east Pacific SSTA while the second mode has positive correlation with Japanese sea SSTA. When the summer rainfall TBO increased at Yangtze-Huaihe river valley (the first mode), the west Pacific SST is higher and the east Pacific SST is lower than normal period, 850 hPa has an anticyclone anomaly over eastern China and along the coast, the correlation field between the first model and 500 hPa height anomaly presents '+-+’ pattern over east Asia, the south Asia anticyclone strengthens at 200 hPa and the position of the west jet moves south. When the position of summer rainfall TBO moves north (the second mode), 850 hPa has an cyclone anomaly over eastern China and along the coast, the south Asia anticyclone weakens at 200 hPa and the position of the west jet moves north. |
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| Keywords: | Summer rainfall Tropospheric quasi-biennial oscillation (TBO) Spatial-temporal distribution General circulation Sea Surface Temperature (SST) |
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