| 亚洲中高纬环流春夏季节转换过程的关键特征 |
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| 引用本文： | 布和朝鲁,林大伟,齐道日娜,诸葛安然.亚洲中高纬环流春夏季节转换过程的关键特征[J].大气科学,2022,46(1):151-167. |
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| 作者姓名： | 布和朝鲁 林大伟 齐道日娜 诸葛安然 |
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| 作者单位： | 1.中国科学院大气物理研究所国际气候与环境科学中心，北京100029 |
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| 基金项目： | 国家自然科学基金重点项目41630424 |
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| 摘 要： | 亚洲中高纬环流春夏季节转换是亚洲大陆上发生的不同区域春夏季节转换中的一个重要组成部分,它为江淮流域梅雨形势的建立提供必要的中高纬环流条件.但是关于其独特性和关键特征,迄今为止尚没有系统性的总结.本文利用NCEP/NCAR再分析资料Ⅰ的逐日数据,分析和总结了这一春夏季节转换过程的关键特征.亚洲中高纬环流春夏季节转换以50...
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| 关 键 词： | 亚洲中高纬环流 春夏季节转换 东北亚脊 东北亚低压 阻塞高压 |
| 收稿时间： | 2021-02-06 |
Key Circulation Characteristics of Spring-to-summer Seasonal Transition Process over Mid-and High-Latitude Asia |
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| BUEH Cholaw,LIN Dawei,CHYI Dorina,ZHUGE Anran.Key Circulation Characteristics of Spring-to-summer Seasonal Transition Process over Mid-and High-Latitude Asia[J].Chinese Journal of Atmospheric Sciences,2022,46(1):151-167. |
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| Authors: | BUEH Cholaw LIN Dawei CHYI Dorina ZHUGE Anran |
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| Abstract: | The spring-to-summer seasonal transition over mid- and high-latitude Asia (MHASST) is an important part of several spring-to-summer seasonal transitions in different regions of the Asian continent. It provides the necessary circulation conditions in the mid- and high-latitudes for the establishment of the Meiyu rainfall in the Yangtze and Huaihe River basins. However, so far, there is no systematic summary of its uniqueness and key characteristics. This paper analyzes and summarizes the key characteristics of the MHASST process based on the daily data of NCEP/NCAR reanalysis data I. The MHASST is symbolized by the establishment of the Northeast Asian ridge at 500 hPa and the “double blocking” circulation pattern. The formation of the Northeast Asian ridge and its related land-sea temperature difference is mainly attributed to the snow melting process and consequently the local strong warming process in Northeast Asia. The establishment of the northern East Asian low (850 hPa) is another important sign of the MHASST. When the MHASST occurs, the 200-hPa Asian jet axis over the Tibetan Plateau jumps northward from 35°N to 37°N, while the Asian temperate jet disappears completely. With the seasonal change, the meridional gradient of the near-surface temperature in the mid- and high-latitude Asia weakens, thus causing the attenuation of high-frequency transient baroclinic disturbances. In contrast, low-frequency weather systems, including the Asian blocking high and the Northeast China cold vortex system, become the dominant weather systems in the same region. From the perspective of the early and late timing of the MHASST, this paper also discusses the evolution features of the circulation and weather system over the mid- and high-latitude Asia. The obtained results further supplement the key information of the climatic MHASST. |
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