[1]覃卫坚,何莉阳,蔡悦幸.广西持续性区域暴雨对热带季节内振荡的响应特征[J].气象研究与应用,2021,42(04):32-37.[doi:10.19849/j.cnki.CN45-1356/P.2021.4.06]
　QIN Weijian,HE Liyang,CAI Yuexing.Response characteristics of persistent regional rainstorm to Madden-Julian Oscillation in Guangxi[J].Journal of Meteorological Research and Application,2021,42(04):32-37.[doi:10.19849/j.cnki.CN45-1356/P.2021.4.06]
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广西持续性区域暴雨对热带季节内振荡的响应特征()
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气象研究与应用[ISSN:1673-8411/CN:45-1356/P]

卷:
第42卷
期数:
2021年04期
页码:
32-37
栏目:
研究论文
出版日期:
2022-01-27

文章信息/Info

Title:
Response characteristics of persistent regional rainstorm to Madden-Julian Oscillation in Guangxi
作者:
覃卫坚;  何莉阳;  蔡悦幸
广西壮族自治区气候中心，南宁 530022
Author(s):
QIN Weijian;  HE Liyang;  CAI Yuexing
Guangxi Climate Center, Nanning Guangxi 530022, China
关键词:
持续性区域暴雨; 热带季节内振荡; 广西
Keywords:
persistent regional rainstorm; Madden-Julian Oscillation; Guangxi
分类号:
P426
DOI:
10.19849/j.cnki.CN45-1356/P.2021.4.06
摘要:
使用广西90个地面气象观测站逐日降水资料、NCEP/NCAR再分析资料等，研究了广西持续性暴雨气候特征及其对热带季节内振荡（Madden-Julian Oscillation，MJO）的响应特征。结果表明，沿海地区暴雨过程持续天数历史最长、持续性暴雨过程次数最多；前汛期持续性区域暴雨发生前期MJO多处于上游地区，随时间变化向东逐渐增多，暴雨发生时MJO处于印度洋中东部次数最多，此时副热带高压西伸到南海区域，广西处于副热带高压边沿，索马里越赤道气流夹带着水汽穿过印度洋，源源不断给广西送来丰富的水汽；后汛期持续性区域暴雨发生前期MJO位于海洋性大陆次数随时间临近增多，暴雨发生时MJO位于海洋性大陆西部次数偏多，此时副热带高压偏弱，广西上空为气旋性环流，越赤道水汽输送带明显比前汛期第3位相时宽大、偏强，在西南风引导下向广西移动，利于持续性区域暴雨维持。
Abstract:
Using the daily precipitation data and NCEP/NCAR reanalysis data of 90 surface meteorological stations in Guangxi, the climatic characteristics of persistent rainstorm in Guangxi and its influence on Madden-Julian Oscillation(MJO)were studied. The results show that the duration of rainstorm process in coastal areas is the longest and the number of persistent rainstorm processes is the most. In the first flood season, MJO was mostly located in the upper reaches of the upstream area and gradually increased eastward over time before the persistent regional rainstorm occurred. When the rainstorm occurred, the MJO was in the central and eastern Indian Ocean most frequently. At this time, the subtropical high stretched westward to the South China Sea region, and Guangxi was on the edge of the subtropical high. The Somalia cross-equatorial air current entrained water vapor across the Indian Ocean, continuously sending abundant water vapor to Guangxi. In the post flood season, the number of MJO located in the marine continent increased with time before the persistent regional rainstorm occurred. When the rainstorm occurred, MJO was located in the west of the marine continent more often. At this time, the subtropical high was weak, and there was a cyclonic circulation over Guangxi. The cross equatorial water vapor transport belt was significantly wider than that in the third phase of the first flood season. It was strong and moved to Guangxi under the guidance of southwest wind, which was conducive to the maintenance of persistent regional rainstorm in Guangxi.

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备注/Memo

备注/Memo:
收稿日期:2021-07-10。
基金项目:广西自然科学基金（2019GXNSFAA245048）、广西科技计划项目（桂科AB21075005）
作者简介:覃卫坚（1971—），男，广西人，博士，正研级高级工程师，主要从事短期气候预测方法研究。E-mail：qinweijian2008@126.com
更新日期/Last Update: 1900-01-01