东亚夏季风的年际变化及其与环流和降水的关系
收稿日期: 2007-11-28
修回日期: 2008-04-24
网络出版日期: 2008-07-25
基金资助
科技部国际科技合作项目(2007DFB20210); 国家自然科学基金项目(90502003); 中日政府间JICA 渠道技术合作项目“中日气象灾害合作研究中心”
Inter annual Var iation of East Asian Summer Monsoon and the Relationship with Atmospher ic Circulation and Rainfall
Received date: 2007-11-28
Revised date: 2008-04-24
Online published: 2008-07-25
Supported by
Cooperative Project funded by the Ministry of Science and Technology of the People's Republic of China, No.2007DFB20210; National Natural Science Foundation of China, No.90502003; JICA China-Japan technical cooperative project “ China-Japan Cooperative Research Center on Meteorological Disasters”
利用1951-2006 年6-8 月NCEP/NCAR 的500 hPa 高度场、850 hPa 高度场和风场、降 水率和海平面气压以及全国600 多站的降水量资料, 选择东亚—西太平洋地区(10o-80oN, 70o-180oE) 经9 点高通滤波、EOF 分析、合成分析和其它统计诊断手段, 研究了东亚夏季风的年际变化及其与环流和降水的关系, 得到如下的结论: 1. 东亚—西太平洋地区海平面气压 存在着蒙古低压和西太平洋高压之间纬向的偶极子振荡型(APD), APD 指数可以作为东亚夏季风强度指数; 2. 东亚—西太平洋地区500 hPa 高度距平EOF 的第一模态具有明显经向东亚遥相关型特征(EAP)。EAP 指数也可以作为东亚夏季风强度指数。3. APD 指数与500 hPa (或 850 hPa) 的东亚遥相关型关系密切。APD 指数和EAP 指数存在明显的反相关关系, 它们之间的相关系数为-0.23, 已超过了10%显著检验; 4. APD 指数和EAP 指数都和我国汛期降水、东亚—西太平洋降水率关系密切, 超过5%显著性的相关区主要在长江流域以南地区至日本南部海面一带, 前者为正相关, 后者为负相关。
关键词： 夏季风; 东亚—西太平洋偶极子; 东亚遥相关型; 降水
于淑秋, 林学椿, 施晓晖 . 东亚夏季风的年际变化及其与环流和降水的关系[J]. 地理学报, 2008 , 63(7) : 751 -760 . DOI: 10.11821/xb200807009
Using NCEP/NCAR reanalysis geopotential height and winds at 500 hPa and 850 hPa, precipitation rate, sea level pressure (SLP), as well as the observed precipitation from more than 600 stations in China in June- August from 1951 to 2006 and focusing on the East Asia -West Pacific region (10o-80oN, 70o-180oE), interannual variation of East Asian summer monsoon (EASM) and the relationship with atmospheric circulation and rainfall are studied by means of statistical diagnose methods, such as 9 points high-pass filter, empirical orthogonal function (EOF) analysis, composite analysis etc. Some conclusions can be drawn as below: (1) From the EOF analysis result of SLP in the East Asia -West Pacific region, a zonal dipole oscillation mode between Mongolia cyclone and West Pacific anticyclone (APD) can be found and the APD index can act as an intensity index of EASM. (2) The EOF-1 of anomalies of geopotential height at 500 hPa show an obvious meridional East Asia remote correlation mode (EAP) and EAP index also can be seen as an intensity index of EASM. (3) The result of composite analysis to the years with high/low APD index reveals that APD index is closely correlated with EAP at 500 hPa/850 hPa. The correlation coefficient between APD index and EAP index is - 0.23, which can pass the significant test at confidence level 0.1. (4) Both APD index and EAP index are closely correlated with rainfall in the flood season in China and precipitation rate in the East Asia -West Pacific region. The significant correlation areas at confidence level 0.05 are mainly located in the scope from the land south of the Yangtze River valley to the sea south to Japan, and the former/latter is positive/negative, respectively.
[1] Guo Qiyun. Analysis of East-Asian summer monsoon intensity index and its variation. Acta Geographica Sinica, 1983, 38(3): 207-217.
[郭其蕴. 东亚夏季风强度指数及其变化的分析. 地理学报, 1983, 38(3): 207-217.]
[2] Shi Neng, Zhu Qiangen, Wu Bingui. East Asian summer monsoon and summer large-scale weather and climate anomalies over China in recent years. Chinese Journal of Atmospheric Sciences, 1996, 20(5): 575-583.
[施能, 朱乾根, 吴彬贵. 近年东亚夏季风及中国夏季大尺度天气气候异常. 大气科学, 1996, 20(5): 575-583.]
[3] Sun Xiurong, Chen Longxun, He Jinhai. Index of land-sea thermal difference and its relation to interannual variation of summer circulation and rainfall over East Asian. Acta Meteorologica Sinica, 2002, 60(2): 164-172.
[孙秀荣, 陈隆勋, 何 金海. 东亚海陆热力差异指数及其与环流和降水的年际变化关系. 气象学报, 2002, 60(2): 164-172.]
[4] Wu Aiming, Ni Yunqi. The influence of Tibetan Plateau on the interannual variability of Asian Monsoon. Advances in Atmospheric Sciences, 1991, 14(5): 96-108.
[5] Webster P, Yang S. Monsoon and ENSO, selectively interactive system. Quart J R Meteor Soc, 1992, 118(8): 887-926.
[6] Zhu Congwen, He Min, He Jinhai. Tropical circulation index and interannual variation of summer floods and droughts in the middle and lower reaches of Yangtze River. Journal of Nanjing Institute of Meteorology, 1998, 21(1): 15-22.
[ 祝从 文, 何敏, 何金海. 热带环流指数与夏季长江中下游旱涝的年际变化. 南京气象学院学报, 1998, 21(1): 15-22.]
[7] Huang Gang. East Asian monsoon circulation abnormality index and its interannual variation. Chinese Science Bulletin, 1999, 44: 421-424.
[黄刚. 东亚夏季风环流异常指数及其年际变化. 科学通报, 1999, 44: 421-424.]
[8] Zhang Qinyun, Tao Shiyan. Summer East Asian tropical and subtropical monsoon and rainfall in eastern China. Journal of Applied Meteorological Science, 1998 (Suppl.): 16-23.
[张庆云, 陶诗言. 夏季东亚热带和副热带季风与中国东部降 水. 应用气象学报, 1998 (增刊): 16-23.]
[9] Gao Hui, Zhang Fanghua. Comparison on East-Asian summer monsoon index. Journal of Tropical Meteorology, 2003, 19(1): 79-86.
[高辉, 张芳华. 关于东亚夏季风指数的比较. 热带气象学报, 2003, 19(1): 79-86.]
[10] Zhao Ping, Zhang Renhe. Correlation of interannual variation between an eastern Asia-Pacific Dipole pressure pattern and East Asian monsoon. Chinese Journal of Atmospheric Sciences, 2006, 30(2): 307-316.
[赵平, 张人禾. 东亚北太平 洋偶极型气压场及其与东亚季风年际变化的关系. 大气科学, 2006, 30(2): 307-316.]
[11] Guo Qiyun, Cai Jingning, Shao Xuemei et al. Studies on the variations of East-Asian summer monsoon during 1873-2000. Chinese Journal of Atmospheric Sciences, 2004, 28(2): 207-215.
[郭其蕴, 蔡静宁, 邵雪梅等. 1873-2000 年东亚夏季风变化的研究. 大气科学, 2004, 28(2): 207-215.]
[12] Xu Xiangde. On the consistence of the interdecadal change of summer monsoon over eastern China and the heterogeneity of spring surface air temperature. Journal of the Meteorological Society of Japan, 2007, 85A: 311-323.
[13] Huang Ronghui, Chen Wen, Ding Yihui et al. Studies on the monsoon dynamics and the interaction between monsoon and cycle. Chinese Journal of Atmospheric Sciences, 2003, 27(4): 484-502.
[黄荣辉, 陈文, 丁一汇等. 关于季风动力 学以及季风与循环相互作用的研究. 大气科学, 2003, 27(4): 484-502.]
[14] Kistler R, Kalnay E, Collins W et al. The NCEP-NCAR 50-year reanalysis: Monthly means CD-ROM and documentation. Bulletin of American Meteorological Society, 2001, 82: 247-267.
[15] Lin Xuechun, Zhang Suqin. Characteristics of the circulation during the catastrophic flood period over China in 1998. Chinese Journal of Geophysics, 2000, 43(5): 607-615.
[林学椿, 张素琴. 1998 年中国特大洪涝时期的环流特征. 地球 物理学报, 2000, 43(5): 607-615.]
[16] Yu Shuqiu, Lin Xuechun. Characteristics of two general circulation patterns during floods over the Changjiang-Huaihe River Valley. Chinese Journal of Atmospheric Sciences, 2006, 64(5): 605-613.
[于淑秋, 林学椿. 两类江淮大水的大 气环流特征. 气象学报, 2006, 64(5): 605~613.]
[17] Tao Shiyan, He Taoxiu, Yang Zufang. The observational research on summer monsoon onset of the East Asian region during the monsoon experiment in 1979. Chinese Journal of Atmospheric Sciences, 1983, 7(4): 347-355.
[ 陶诗言, 何 涛秀, 杨祖芳. 1979 年季风试验期间东亚地区夏季风爆发的观测研究. 大气科学, 1983, 7(4): 347-355.]
[18] Chen Longxun, Jin Zuhui. The medium-term changes in the northern and southern hemispheres interaction within East Asian Summer Monsoon Circulation System. Collection of National Tropical Summer Monsoon Academic Conferences. Kunming: Yunnan People's Press, 1983. 218-229.
[陈隆勋, 金祖辉. 夏季东亚季风环流系统内中期变化 的南北半球相互作用. 全国热带夏季风学术会议文集. 昆明: 云南人民出版社, 1983. 218-229.]
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