| 极涡与南亚高压的关系及对我国降水的协同影响 |
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| 引用本文： | 崔乃文,范广洲.极涡与南亚高压的关系及对我国降水的协同影响[J].高原山地气象研究,2021,0(2):1-9. |
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| 作者姓名： | 崔乃文 范广洲 |
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| 作者单位： | 1.成都信息工程大学大气科学学院，成都 610225 |
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| 基金项目： | 国家自然科学基金项目（42075019，42075081）；国家重点研发计划项目（2018YFC1505702）；第二次青藏高原综合科学考察研究项目（2019QZKK0102） |
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| 摘 要： | 利用1951~2016年NCAR再分析月平均资料及台站降水资料，研究了极涡与南亚高压的关系及其对我国降水的协同影响。结果表明:极涡和南亚高压在夏、秋、冬季周期变化的时间尺度基本一致，夏季为准9a尺度变化，秋季为准8a尺度变化，冬季为准4a尺度变化；极涡和南亚高压的相关性在夏季最强，在春季最弱，其同期变化对我国降水的影响十分显著；根据同期的极涡和南亚高压各自面积指数标准化距平的正负，将“正-正、正-负、负-正、负-负“四个模态分别定义为SS型、SW型、WS型、WW型，其中SW型与WS型占比较多，表明极涡与南亚高压的同期变化以负相关为主；春季极涡与南亚高压对我国降水的影响主要在新疆及东北渤海湾一带，SS型和WS型对应北方多雨，SW型和WW型反之；夏季其影响主要在高原北部及长江中下游地区，除SW型以外，其余三种分型均对应长江中下游地区多雨；秋季其影响主要在新疆地区，SS型和WS型对应该地区降水偏多，SW型和WW型反之；冬季其影响主要在新疆至长江三角洲一带，SW型对应40°N附近地区多雨，WW型对应西北至东南地区少雨；夏季，极涡与南亚高压的异常调整了东亚大气环流的配置，进而对我国的降水产生影响。
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| 关 键 词： | 极涡 南亚高压 协同影响 气候特征 |
| 收稿时间： | 2021-04-19 |
The Relationship between Polar Vortex and South Asian High and Its Synergistic Influences on Precipitation in China |
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| Affiliation: | 1.School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China2.Plateau Atmosphere and Environment Key Laboratory of Sichuan Province/ Joint Laboratory of Climate and Environmental Change, Chengdu 610225, China |
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| Abstract: | Based on NCAR reanalysis monthly mean data and station precipitation data from 1951 to 2016, the relationship between polar vortex and South Asia High and its synergistic effect on precipitation in China are studied. The results show that the variations of the polar vortex and the South Asia High in summer, autumn and winter are basically the same. The quasi-9-year scale change occurs in summer, the quasi-8-year scale change occurs in autumn, and the quasi-4-year scale change occurs in winter. The correlation between polar vortex and South Asia High is the strongest in summer and the weakest in spring. The effect of them on precipitation in China is very significant. According to the posistive and negative standardised anomalies of the polar vortex and the South Asian High's area indices, four modes of positive-positive, positive-negative, positive-negative, positive-negative are defined as SS type, SW type, WS type, and WW type respenctively. Among them, SW type and WS type account for more, indicating that the simultaneous changes of the polar vortex and the South Asian High are negatively correlated more. In spring, polar vortex and the South Asia High affect precipitation mainly in Xinjiang and the Northeast Bohai Bay. The SS type and WS type correspond to the rain in the north, while the SW type and WW type are the opposite. In summer, the influenced areas are mainly in the northern plateau and the middle and lower reaches of the Yangtze River. Except for the SW type, the other three types correspond to the rainy areas in the middle and lower reaches of the Yangtze River; in autumn, the impact is mainly in Xinjiang, and the SS and WS types corresponde to more precipitaiton in the areas, and the SW and WW types are opposite; in winter, the impact is mainly from Xinjiang to the Yangtze River Delta, the SW type corresponds to rainy areas near 40°N, and the WW type corresponds to less rainy areas from northwest to southeast regions. In summer, the abnormality of the polar vortex and the South Asia High adjusts the configuration of the East Asian atmospheric cirulation, which has an impact on China's precipitation. In winter, SW type and WW type are consistent. SW type is rainy near 40°N, while WW type is less rainy from northwest to southeast of China. The anomalies of polar vortex and South Asia High affect the configuration of the general circulation in East Asia, and then affect the precipitation in China. |
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