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CHARACTERISTICS OF THE meridionally oriented shear lineS OVER THE TIBETAN PLATEAU AND ITS RELATIONSHIP WITH RAINSTORMS IN THE BOREAL SUMMER HALF-YEAR

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Journal of Tropical Meteorology 2020年第1期26卷 93-102页

作者： YAO Xiu-ping ZHANG Xia MA Jia-li China Meteorological Administration Training Centre Beijing 100081 China State Key Laboratory on Severe Weather of Chinese Academy of Meteorological Sciences Beijing 100081 China Henan Provincial Meteorological Observatory Zhengzhou450003 Liaoning Provincial Weather Modification Office Shenyang 110166 China

In this paper,European Center for Medium-Range Weather Forecasts(ECMWF)Reanalysis-Interim(ERAInterim)data and daily precipitation data in China from May to October during 1981-2016 are used to study the climatic characteristics of the meridionally oriented shear lines(MSLs)over the Tibetan Plateau(TP).The relationship between the MSL and rainstorms in the eastern TP and neighboring areas of the TP during the boreal summer half-year is also *** objective method,which uses a combination of three parameters,*** zonal shear of the meridional wind,the relative vorticity and the zero line of meridional wind,is adopted to identify the shear *** results show that there are two high-occurrence centers of *** is over the central TP(near 90°E)and the other is over the steep slope area of the eastern *** MSLs are found along the Yarlung Zangbo River over the western TP and the southern *** are averagely 42.2 MSL days in each boreal summer *** number of MSL days reaches the maximum of 62 in 2014 and the minimum of 22 in *** and October witness the maximum of 10.2 MSL days/year and the minimum of 4.2 MSL days/year,*** annual number of the MSL days shows periodicities of 2-4 and 4-6 years,which is quite similar to those of the MSL rainstorm *** the neighboring areas of the TP,nearly56%of the MSLs lead to rainstorms,and nearly 40%of rainstorms are caused by the MSLs,indicating a close relationship between the MSLs and rainstorms in this region.

关键词： Tibetan Plateau meridionally oriented shear line rainstorm climatic characteristics

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