| 摘要: |
| 为提升夏秋季高温干旱预报能力，本文利用CIMISS数据中心实际观测资料、NCEP/NCAR 再分析等资料，结合气象干旱综合指数（MCI），对江西省2022年夏秋干旱期间的大气环流特征进行分析。结果表明：此次高温干旱过程为1961年以来所罕见，高温与干旱均具有时间长、范围广、强度大等特征，两者的叠加与协同，刷新多项气候值纪录，其大气环流形势具有以下特征：夏季槽脊稳定，副高异常偏强、偏北，孟加拉湾水汽在南海转向，并入东亚副热带夏季风，进入更北方地区，使得干旱发生发展；秋季贝加尔湖附近为弱的负高度距平，中高纬环流平直，经向环流弱于常年同期，冷空气不频繁，少于常年同期，同时，盘踞在华南及江南部分地区分裂的副高系统偏强，阻止冷暖空气在上空的交汇，上空气流的下沉造成增温和变干，低层受大陆反气旋环流、南海和西北太平洋气旋性环流影响，造成水汽输送减少，不利于降水的产生，使得干旱继续加剧。此外，7-10月无台风影响，也是江西异常高温干旱的成因之一。 |
| 关键词: 高温; 干旱; 环流; 夏秋季 |
| DOI： |
| 投稿时间：2023-05-10修订日期：2024-05-08 |
| 基金项目:江西省气象局科研业务项目（JX2022Q04JX2022Q04） |
|
| Characteristics of high temperature and drought in Summer and Autumn and Circulation in Jiangxi Province in 2022 |
| shaomingyang,Zhoushanhua,CHEN Xiny |
| (Jiujiang Meteorological bureau;Xiushui Meteorological bureau) |
| Abstract: |
| In order to improve the ability to predict high temperature and drought in summer and autumn, this article analyzes the actual observation data from the CIMISS data center, NCEP/NCAR reanalysis data. Combined with the meteorological drought index (MCI), the characteristics of atmospheric circulation during the summer autumn drought in Jiangxi Province in 2022 were analyzed.The results showed that:?This high-temperature and drought process has been rare since 1961. Both high temperature and drought have the characteristics of long duration, wide range, and high intensity.The superposition and synergy of the two have refreshed multiple climate value records.The atmospheric circulation situation has the following characteristics:The trough ridge is stable in summer. The subtropical high pressure is abnormally strong and northward. At the same time, the water vapor in the Bay of Bengal shifts in the South China Sea and merges with the East Asian subtropical summer monsoon, entering further north, causing drought to occur and develop.In autumn, there is a weak negative height anomaly near Lake Baikal.The circulation in mid-high latitudes is straight.The meridional circulation is weaker than the same period of the year.Cold air is infrequent and less than the same period of the year.At the same time, the subtropical high system that is divided in parts of southern China and Jiangnan is stronger, preventing the intersection of cold and warm air in the upper air.The sinking of the upper airflow causes warming and drying.The lower layer is affected by the circulation of the continental anticyclone, the cyclonic circulation of the South China Sea and the northwest Pacific, resulting in reduced water vapor transport, which is not conducive to precipitation, causing drought to continue to intensify.In addition, the absence of typhoons from July to October is also one of the causes of the unusually high temperature and drought in Jiangxi. |
| Key words: High temperature; Drought; Circulation; Summer and autumn |
