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The Effect of the Subtropical Jet on the Rainfall over Southern China in January 2008

Advances in Atmospheric Sciences 2014年第3期31卷 543-550页

作者： ZUO Qunjie GAO Shouting L Daren Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric Physics Chinese Academy of Sciences Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences

ABSTRACT The third precipitation episode of China＇s great snowstorms of 2008 was analyzed using station observations and ECMWF six-hourly data. The variation of the shape of the upper-level subtropical jet played an important role in the rainfall over south- ern China. With the eastward movement of the trough, the jet shape changed from two straight jets to a tilting jet over China and then it moved southward. With these variations, the south-north movement of ascending flow and precipitation area over southern China occurred.

关键词： upper-level subtropical jet transverse circulation ageostrophic wind snowstorms

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The Effects of Strong ageostrophic Outflows on the Formation of Surface Mesoscale Pressure Systems in Squall Lines

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Acta meteorologica Sinica 2010年第2期24卷 225-238页

作者：姜勇强王元 Key Laboratory of Mesoscale Severe Weather/Ministry of Education of China and School of Atmospheric SciencesNanjing University Institute of Meteorology PLA University of Science and Technology

Based on the previous study of the streamline field triggered by singularities in a two-dimensional potential flow,the wind field caused by vorticity lines in an incompressible flow is deduced in this *** result shows an elliptic cyclonic（anticyclonic） circulation in association with a positive（negative） vorticity *** use of the shallow-water model,the flow fields are simulated in a weak wind background under the influence of mesoscale vorticity *** the case of two vorticity line,one positive and the other negative,a mesoscale vortex couplet forms in the *** three vorticity lines are considered,three mesoscale circulations develop,and a mesohigh and two mesolows similar to the thunderstorm high,wake low and pre-squall mesolow of a mature squall line are *** analysis and numerical simulations show that the formation of the surface mesoscale pressure systems in squall lines may be partly attributed to the dynamical effects of the ageostrophic *** strong downdrafts under the thundercloud base of the squall line lead to surface ageostrophic outflows,and produce positive-negative-positive arranged vertical vorticity bands（VBs） along the direction normal to the squall line,then the mesoscale circulations develop and mesoscale pressure systems form or strengthen during the geostrophic *** use of the scale separation method,this dynamic mechanism is confirmed by a case study of a severe storm passing over eastern China on 17 June 1974.

关键词： squall line ageostrophic wind vorticity line mesoscale pressure system

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