[1]余锐,孙丽颖,周晓晔.东亚夏季风对中国大陆夏季热带气旋降水的影响[J].气象研究与应用,2023,44(03):15-20.[doi:10.19849/j.cnki.CN45-1356/P.2023.3.03]
　YU Rui,SUN Liying,ZHOU Xiaoye.Impact of East Asian summer monsoon on summer tropical cyclone precipitation in mainland China[J].Journal of Meteorological Research and Application,2023,44(03):15-20.[doi:10.19849/j.cnki.CN45-1356/P.2023.3.03]
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东亚夏季风对中国大陆夏季热带气旋降水的影响()
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气象研究与应用[ISSN:1673-8411/CN:45-1356/P]

卷:
第44卷
期数:
2023年03期
页码:
15-20
栏目:
出版日期:
2023-09-15

文章信息/Info

Title:
Impact of East Asian summer monsoon on summer tropical cyclone precipitation in mainland China
作者:
余锐1;  孙丽颖2;  周晓晔3
1. 佛山市三水区气象局, 广东 佛山 528100;
2. 广州市增城区气象局, 广州 511300;
3. 安徽省气象台, 合肥 230031
Author(s):
YU Rui1;  SUN Liying2;  ZHOU Xiaoye3
1. Sanshui Meteorological Bureau, Guangdong Foshan 528100, China;
2. Zengcheng Meteorological Bureau, Guangzhou 511300, China;
3. Anhui Meteorology Observatory, Hefei 230031, China
关键词:
热带气旋; 降水; 东亚夏季风
Keywords:
tropical cyclone; precipitation; East Asian summer monsoon
分类号:
P444
DOI:
10.19849/j.cnki.CN45-1356/P.2023.3.03
摘要:
利用中国大陆格点降水资料和热带气旋最佳路径数据集提取热带气旋降水,在线性去除ENSO信号后,研究东亚夏季风对中国大陆夏季热带气旋降水的影响。结果表明,1979-2019年,中国大陆6-8月热带气旋降水与东亚夏季风指数呈现显著的正相关,相关系数达到0.53。东亚夏季风的减弱,使得西北太平洋大部分海域对流层低层的正涡度和气旋环流增强、中层的湿度正异常和垂直上升运动增强、垂直风切变减弱,有利于热带气旋的生成和发展;同时,在西北太平洋热带气旋的主要生成区对流层中层呈现气旋环流异常,因此中国大陆沿海地区存在东风异常,有利于引导热带气旋移向中国大陆,使得中国大陆夏季热带气旋降水增加。研究结果说明东亚夏季风可通过调制影响热带气旋生成和路径的大尺度环境场,进而与中国大陆夏季热带气旋降水的年际变化相联系。
Abstract:
Based on the grid-point precipitation data and the best track dataset of tropical cyclones, this study extracts the tropical cyclone precipitation(TCP) in mainland China and reveals a significant effect of the East Asian summer monsoon on the TCP in mainland China after removing El Ni? Southern Oscillation(ENSO) signals. The results show that during the period 1979-2019, the TCP in mainland China from June to August shows a significant positive correlation of 0.53 with the East Asian summer monsoon index. The weakening of the East Asian summer monsoon has resulted in the enhancement of the positive vorticity and cyclonic circulation in the lower troposphere, positive moisture anomalies in the middle layer, and vertical upward motion, and the weakening of the vertical wind shear over most of the NW Pacific, which is favorable to the generation and development of tropical cyclones. Meanwhile, there is an anomalous mid-tropospheric cyclone over the main TC genesis region in the Northwestern Pacific ocean, meaning that an easterly anomaly dominates the coastal regions of mainland China, which is favorable for TC movement towards mainland China, resulting in an increase in the summer TCP in mainland China. Therefore, by modulating the large-scale environmental fields which affects the frequency of TC genesis and TC track, the East Asian summer monsoon can be connected with the interannual variation of the summer TCP in mainland China.

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备注/Memo

备注/Memo:
收稿日期:2023-6-1。
基金项目:广东省气象局科学技术研究项目(GRMC2021XQ16)、广州市气象学会科学技术研究项目(Q202201)
作者简介:余锐(1993-),男,工程师,主要从事灾害性天气研究工作。E-mail:meteoyr@163.com
更新日期/Last Update: 1900-01-01