摘要
应用１９９３年４月２５日～５月４日四川盆地加密观测探空资料，分析了四川盆地边界层风场变化规律及其与４月３０日～５月１日盆地初夏少见的大范围大风、冰雹、暴雨天气过程的关系。通过分析进一步证实：西邻青藏高原的成都是四川盆地天气变化的关键信息点；在高原盆地特定地形的影响下，成都边界层风场呈规律性变化，其全息图像是：当成都边界层为东北风时，四川盆地边界层维持气旋式偏东流场，处于辐合、正涡度、上升运动区中，盆地未来产生暴雨等强对流天气；当为其它风向（多为西南风）时，盆地边界层维持反气旋式偏南流场，处于辐散、负涡度、下沉运动区中，盆地未来是无降水晴好天气。
By using the enhanced observation radiosonde data during the period from April 25 to May 4,1993 in Sichuan Basin(SB),the relationship between wind field evolution in planetary boundary layer(PBL) at Chengdu and the widespread high wind,hail and heavy rain processes in SB on April 30～May 1,1993 are analyzed. It is further confirmed that Chengdu station near the Qinghai-Xizang Plateau is a information point for the weather variation in SB. It shows the important observation fact that under the effect of specific topography of the Plateau-Basin,the wind field in PBL over SB is regular variation. Its holographic image is that when it is blowing northeast wind,the PBL over SB maintains easterly cyclonic flow field with convergence,positive vorticity and ascending motion,and it will be strong convection weather such as heavy rain. When blowing non-northeast wind,especially southwest wind,the PBL over SB maintains southerly anticyclonic flow field with divergence, negative vorticity and descending motion,and it will be rainless weather.
出处
《高原气象》
CSCD
北大核心
1997年第3期331-336,共6页
Plateau Meteorology
关键词
信息点
边界层
风场
盆地
天气意义
Sichuan Basin Information point Wind field in PBL
