SUN Xin,GONG Yuanfa,GUO Lifang,et al.A Study on the Summer Monsoon over the Tibetan Plateau based on High Resolution Reanalysis Data[J].Journal of Chengdu University of Information Technology,2025,40(05):633-642.[doi:10.16836/j.cnki.jcuit.2025.05.010]
基于高分辨率再分析资料的青藏高原夏季风研究
- Title:
- A Study on the Summer Monsoon over the Tibetan Plateau based on High Resolution Reanalysis Data
- 文章编号:
- 2096-1618(2025)05-0633-10
- Keywords:
- Tibetan Plateau; summer monsoon; precipitation; East Asian; South Asian
- 分类号:
- P467
- 文献标志码:
- A
- 摘要:
- 为进一步分析高原夏季风的变化特征,利用1979-2019年高分辨率再分析数据ERA地面和高空的高分辨率再分析资料以及CPC全球逐日降水数据,在分析青藏高原夏季地面风场气候特征的基础上,定义一个新的青藏高原地面夏季风指数(TPVI),并且采用相关分析、合成分析的方法,分析高原夏季风的变化特征,研究高原夏季风变化对高原及其邻近的南亚和东亚地区降水和季风环流系统的不同影响。结果表明,新指数TPVI与汤懋苍经典指数相关性较高,能很好地表征高原季风的变化特征; 高原季风异常强(弱)时,500 hPa上高原主体是异常气旋(反气旋)式环流,高原中东部异常辐合(辐散)、降水异常偏多(少)。印度半岛北部(南部)和高原西南部异常辐散(辐合)、降水偏少(偏多)。在东亚地区,四川盆地到长江流域位于异常环流的辐合(辐散)区、降水偏多(少),江南到华南沿岸位于异常环流辐散(辐合)区、降水偏少(多); 高原夏季风异常变化对南亚季风和东亚季风的影响是不同的,并伴有月际之间的差异。
- Abstract:
- In order to analyze the variation characteristics of the summer monsoon over the Tibetan Plateau,a new surface summer monsoon index(TPVI)was defined based on the analysis of the climate characteristics of the summer surface monsoon field over the Qinghai Tibet Plateau using high-resolution reanalysis data from the ERA ground and upper atmosphere from 1979 to 2019,as well as CPC global daily precipitation data.Correlation analysis and synthesis analysis were used to analyze the variation characteristics of the summer monsoon over the Tibetan Plateau,and the different impacts of the plateau summer monsoon changes on precipitation and monsoon circulation systems over the plateau and its neighboring South and East Asia regions were studied.The results show that the new index TPVI has a high correlation with the Tang Mao cang Classic Index,which can well characterize the characteristics of the changes in the plateau monsoon; When the plateau monsoon is abnormally strong(weak),the main body of the plateau at 500 hPa is an anomalous cyclonic(anticyclonic)circulation,with anomalous convergence(divergence)and excessive(insufficient)precipitation in the central and eastern parts of the plateau.The northern(southern)part of the Indian Peninsula and the southwestern part of the plateau exhibit abnormal divergence(convergence)and less(more)precipitation.In East Asia,the Sichuan Basin to the Yangtze River Basin are located in the convergence(divergence)area of abnormal circulation,with more(less)precipitation,while the Jiangnan to South China coasts are located in the convergence(divergence)area of abnormal circulation,with less(more)precipitation; The impact of abnormal changes in the plateau summer monsoon on the South Asian and East Asian monsoons is different,and there are differences between months.
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备注/Memo
收稿日期:2024-02-28
基金项目:国家自然科学基金资助项目(U20A2097)
通信作者:巩远发.E-mail:gyfa@cuit.edu.cn