GUO Yanxin,WANG Wei.Analysis of Anomalies of Autumn Rain in West China in 2017 and its Possible Mechanism[J].Journal of Chengdu University of Information Technology,2020,35(02):195-202.[doi:10.16836/j.cnki.jcuit.2020.02.011]
2017年华西秋雨异常及其成因分析
- Title:
- Analysis of Anomalies of Autumn Rain in West China in 2017 and its Possible Mechanism
- 文章编号:
- 2096-1618(2020)02-0195-08
- Keywords:
- meteorology; climate change; Autumn rain in West China; El Nino/La Nina; mechanism; The Western Pacific subtropical high
- 分类号:
- TP301.6
- 文献标志码:
- A
- 摘要:
- 2017年秋季(9-10月)华西地区(25 °N～35 °N,100 °E～110 °E)长时间阴雨寡照,对人们的生产和生活造成许多不利影响,通过对华西地区的降水特征和大尺度环流背景进行分析可知2017年为典型秋雨年。结果表明:2017年华西地区秋季多雨区位置较常年偏东、偏北,秋雨具有阶段性分布特征。9月亚欧大陆中高纬地区维持两槽两脊环流型,西太平洋副热带高压(副高)西伸至90 °E,脊线位于20 °N附近,位置偏西、偏南,而10月转为东高西低型,副高西伸至100 °E,脊线位于25 °N附近,位置偏东、偏北; 9月水汽主要来源于孟加拉湾和西太平洋,主要受西北冷空气影响,而10月主要来源于东海,受西路冷空气影响。2017年秋季华西地区位于西风急流入口区右侧,保持着高层辐散、低层辐合的垂直结构,低层的辐合使得不稳定能量释放,产生上升运动,为秋雨提供了有利条件。此外ENSO事件也是造成华西秋雨异常的重要外部强迫条件之一。
- Abstract:
- In view of the problem that the rain and little sunshine in West China for a long time in the autumn of 2017, it caused many adverse effects on people's productions and lives. According to the analysis of precipitation characteristics and large-scale circulation background in west China, 2017 is a typical autumn rain year. The results show that the rainy areas in the west of China in autumn were East and North by the other year in 2017, and the distribution of autumn rain had the characteristics of stage distribution. The circulation situation of two ridges and two troughs maintained in the middle and high latitudes of Eurasia,and The Western Pacific subtropical high extended westward to 90 °E, and the ridge line was located near 20 °N,with a west-south location in September. However, in October, the circulation situation changed to be high in the east and low in the west, while The Western Pacific subtropical high extended westwardto 100 °E. The ridge line was located near 25 °N, which was east-north compared with it in September. In September, water vapor affected by the invasion of northwest cold air mainly came from the bay of Bengal and the western Pacific, while in October, it mainly came from the east China sea affected by the invasion of west cold air. Meanwhile in the autumn of 2017, West China was located on the right side of the entrance area of the westerly jet stream, maintaining the vertical structure of high-level divergence and low-level convergence. The convergence of the low-level made the unstable energy release and generated the ascending movement, which provided advantageous conditions for the autumn rain. In addition, ENSO event, which started in October 2017, was one of the important external forcing conditions that cause the abnormal autumn rain in West China.
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备注/Memo
收稿日期:2019-06-14 基金项目:国家自然科学基金资助项目(41005034); 公益性行业(气象)科研专项资助项目(GYHY201506001)