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《Desert and Oasis Meteorology》 2018-06
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Comparative Analysis of the Two Cases of Tashkent Vortex Weather Processes in Summer in Xinjiang

LI Na;QIN He;LI Ruqi;LI Wei;ZHOU Yaman;Xinjiang Meteorological Observatory;  
Based on the NCEP 1° ×1° reanalysis data, the characteristics of the weather scale circulation, dynamic and water vapor transmission of the two cases of Tashkent vortex weather processes were contrasted and analyzed. The results showed that: during South Asia High center located at 70°E,the south Xinjiang Basin was in the left ahead of the 200 hPa jet export zone,the maintenance of 500 hPa strong southwest airflow and significant easterly jet stream in the southern Xinjiang basin of 700 hPa make for the middle and low level shear line and convergence maintained.At the same time,the water vapor in the Arabian sea transmitted by relay transmission strongly converged with the water vapor carried by the middle and lower easterly jet stream,resulting in largescale rainstorm. Positive MPV1 and negative MPV2 in the upper layer were extended downward,while instability and barotropic property in the middle and lower layers were enhanced. Vertical vorticity growth was stimulated by positive MPV2 and negative MPV1 under 700 hPa, and convective precipitation was strengthened. But as the center of South Asia High maintained over 90 °E,200 hPa jet over southern Xinjiang,the lower vortices were reduced into slots to enter the southern border.Over south Xinjiang Basin,if the easterly airflow of 700 hPa was weaker and located further west,and high level divergence and low level convergence were weaker,it was not conducive to the development of vertical upward movement and the convergence of water vapor. As a result,it was difficult to cause precipitation,even though the influencing system was a Tashkent vortex.
【Fund】: 新疆维吾尔自治区科技支撑项目(201533113)资助
【CateGory Index】: P458.121.1
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