| 摘要: |
| 利用常规观测资料，NCEP1°×1 °再分析资料和MJO指数对台风天鸽(201713)和山竹(201822)从MJO背景条件、环流背景和卫星云图等方面对云南降水影响进行对比分析。分析表明：山竹和天鸽均在广东沿海登陆,其登陆位置偏东后西行进入影响云南的关键区Ⅲ（20°N以北、105°E以西），在MJO强背景下云南强降水区域更大，强度更强。500 hPa上强盛的带状副热带高压引导台风以西行为主进入云南，700 hPa上孟加拉湾至中南半岛一带低压环流与台风低压中心位置纬度差距不大有利于台风低压环流的维持和西移影响云南。台风西行过程中较大的水汽通量、较强的上升运动以及登陆时密实的低压云团、进入广西后对流云系减弱较慢等都有利于台风降水在云南的维持。 |
| 关键词: 台风；降水；MJO； 环流；云图 |
| DOI： |
| 投稿时间：2020-04-02 |
| 基金项目:国家自然基金项目（41665005）:北极涛动对低纬高原地区冬半年降水影响的机理研究；中国气象局预报员专项（CMAY-BY-2020-120）：云南省智能网格预报要素一致性研究；国家自然基金项目（41765003）:高原涡影响下的云南大雨暴雨分布特征及其形成机理研究 |
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| Precipitation Weather Analysis of Typhoon “Mangkhut” and“Hato”in Yunnan |
| FENG Dehua,NIU Fabao,ZHANG Lei |
| (Wenshan Meteorological Bureau of Yunnan Province, Wenshan 663000 , China;Yunnan Provincial Meteorological Bureau, Kunming 650034 , China) |
| Abstract: |
| Based on conventional observation data, NCEP 1°×1° reanalysis data and MJO index, the impact of Hato and Mangkhut on precipitation in Yunnan was compared and analyzed from MJO background conditions, circulation background, satellite cloud image, etc. The results show that both Hato and Mangkhut landed on the coast of Guangdong. The area of heavy precipitation in Yunnan was larger and stronger under the strong MJO background after landing position entered into the key area of Ⅲaffecting Yunnan from east by west. The strong linear subtropical high resistance on 500 hPa guided the typhoon to the west, and then into Yunnan. The latitude of low pressure circulation from the Bay of Bengal to the Indochina region was not much different from the latitude of the center position of the typhoon, it was beneficial to the maintenance of the typhoon low pressure circulation affecting Yunnan. The process of typhoon westbound with the strong water vapor flux and rising movement, the dense low-pressure cloud system. After the typhoon entered Guangxi, the weakening of the convective cloud system was beneficial to the maintenance of its precipitation. |
| Key words: typhoon；precipitation；MJO；circulation；satellite imagery |
