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Seasonal Variations of the East Asian Subtropical Westerly Jet and the Thermal Mechanism

ISSN号：2095-6037
期刊名称：《气象学报：英文版》
时间：0
分类：P46[天文地球—大气科学及气象学]
作者机构：[1]Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, [2]Department of Atmospheric Sciences, Nanjing University, Nanjing 210093, [3]Guangxi Climate Center, Nanning 530022
相关基金：Supported by the National Natural Science Foundation of China under Grant Nos. 40675041, 40333026, and 40672210.

关键词：亚热带, 季节, 热机制, 气候, East Asian subtropical westerly jet （EAWJ）, seasonal variation, thermal mechanism

中文摘要：

东方 Asiansubtropical 西的喷气(EAWJ ) 和热机制的紧张和地点的季节变异被从 1961 ～ 2000 使用 NCEP/NCAR monthlyreanalysis 数据分析。EAWJ 的季节变异集中，这被发现不仅有重要南方的移植，而且显示出快速的带的排水量 duringJune7 月。而且，在那里存在带的矛盾在向北方转移 EAWJaxis 的过程。 EAWJ 季节变异的热机制上的分析显示 EAWJ 季节变异的年度周期与气温的南方的差别的结构匹配很好，建议 EAWJ 季节变异是仔细与由于太阳辐射和陆地海的不同类的加热有关热对比。Throughinvestigating 在 EAWJ 和热运输之间的关系，这被揭示 EAWJweakens 和移动向北方在到夏日的从冬的温暖的时期期间，而 theEAWJ 加强并且变在到冬的从夏日的冷却时期期间向南方。水平热移流运输的 Themeridional 差别是决定南方的温度差别的主要因素。EAWJ 的南方的移动跟随水平热移流运输的最大的南方的坡度的地点。在从 Aprilto 10 月的时期期间，加热的 diabatic 在 EAWJcenter 的带的排水量起主角。西藏的高原加热到中间上面的对流层的 diabatic 在 6 月 7 月期间导致 EAWJ 中心的快速的带的排水量。

英文摘要：

The seasonal variations of the intensity and location of the East Asian subtropical westerly jet （EAWJ） and the thermal mechanism are analyzed by using NCEP/NCAR monthly reanalysis data from 1961 to 2000. It is found that the seasonal variation of the EAWJ center not only has significant meridional migration, but also shows the rapid zonal displacements during June-July. Moreover, there exists zonal inconsistency in the northward shift process of the EAWJ axis. Analysis on the thermal mechanism of the EAWJ seasonal variations indicates that the annual cycle of the EAWJ seasonal variation matches very well with the structure of the meridional difference of air temperature, suggesting that the EAWJ seasonal variation is closely related to the inhomogeneous heating due to the solar radiation and the land-sea thermal contrast. Through investigating the relation between the EAWJ and the heat transport, it is revealed that the EAWJ weakens and shifts northward during the warming period from wintertime to summertime, whereas the EAWJ intensifies and shifts southward during the cooling period from summertime to wintertime. The meridional difference of the horizontal heat advection transport is the main factor determining the meridional temperature difference. The meridional shift of the EAWJ follows the location of the maximum meridional gradient of the horizontal heat advection transport. During the period from April to October, the diabatic heating plays the leading role in the zonal displacement of the EAWJ center. The diabatic heating of the Tibetan Plateau to the mid-upper troposphere leads to the rapid zonal displacement of the EAWJ center during June-July.

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