YANG Han-xue,XIAO Tian-gui,JIN Rong-hua.Analysis of Time and Space and Circulation Characteristics of EAPTeleconnection Patterns in the Northern Hemisphere in Summer[J].Journal of Chengdu University of Information Technology,2018,(04):430-437.[doi:10.16836/j.cnki.jcuit.2018.04.013]
北半球夏季EAP遥相关型的时空及环流特征研究
- Title:
- Analysis of Time and Space and Circulation Characteristics of EAPTeleconnection Patterns in the Northern Hemisphere in Summer
- 文章编号:
- 2096-1618(2018)04-0430-08
- 关键词:
- 气候变化; 遥相关; 东亚-太平洋遥相关型(EAP); 时空特征; 相当正压结构
- Keywords:
- climate change; teleconnection; the East Asia/Pacific pattern teleconnection(EAP); circulation situation; space-time characteristics; equivalent barotropic structure
- 分类号:
- P434+.4
- 文献标志码:
- A
- 摘要:
- 为更好地分析近年来EAP遥相关的时空变化特征,利用1951-2016年NCEP再分析资料,并主要采用合成分析的方法着重对夏季EAP的空间结构以及环流特征等进行了讨论和分析。结果表明,夏季EAP遥相关型的空间模态在各个层次和高度中都有体现,尤其是在对流层中层,并且中心位置都非常接近,表现出了明显的相当正压结构。同时EAP遥相关型主要存在的是准3年周期,主要以年际变化为主。EAP遥相关高指数年分布都呈现“- + -”的分布,西太平洋副热带高压偏北偏东,华南和华北地区降水偏多,而江淮和长江中下游地区夏季降水偏少,且有可能发生干旱; 低指数年则为“+ - +”的分布形势,西太平洋副热带高压偏西偏南,中国江淮流域等地区夏季降水偏多,并可能发生严重的洪涝灾害。
- Abstract:
- In order to better analyze the temporal and spatial variation characteristics of EAP teleconnection in recent years, the NCEP/NCAR reanalysis data is used and the method of synthetic analysis is mainly used to discuss and analyze the spatial structure and circulation characteristics of EAP in summer. The results show that the spatial modes of the teleconnection type are reflected in all levels and heights, especially in the middle troposphere. And the center positions are very close, showing an obvious rather barotropic structure. At the same time, the EAP teleconnection in summer is mainly quasi-3-year periodic variation, so it is mainly interannual variation. The distribution pattern in East Asia in high index year is basically "- + -", and the Western Pacific Subtropical High North is more northward and eastward. The precipitation in Southern China and North China is much more, while the middle and lower reaches of the Yangtze River and Jianghuai area summer precipitation decrease, and droughts may occur. The low value is"+ - +" distribution situation, and the West Pacific subtropical high is more southward and westward. Jianghuai area may increase summer precipitation and occur serious flood disaster possiblely.
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备注/Memo
收稿日期:2018-03-04基金项目:国家自然科学基金资助项目(91337215、41575066); 国家科技支撑计划资助项目(2015BAC03B05); 公益性行业(气象)科研专项资助项目(GYHY201406015)