摘要
针对干空气入侵对东北冷涡降水发展的影响,应用WRF中尺度数值模式对2011年7月一次东北冷涡过程进行数值模拟研究。结果表明:干空气入侵对东北冷涡降水云系发展产生以下两方面的作用:一方面,密度较高的高层干冷空气下沉迫使干侵入前沿暖湿气流抬升,从而促进了东北冷涡降水发展;另一方面,下沉冷空气流向前推进"挤压"可导致冷空气前沿界面较为陡峭、层结不稳定,有助于云系垂直发展,降水主要集中于云系中部。
For understanding the influence of dry intrusion on the precipitation of northeast cold vortex,a typical cold vortex over northeastern China on July 2011 was simulated by WRF model.The results show that:Dry intrusion has affected the cold vortex precipitation in two aspects.On the one hand,the dense air from upper level lifts the warm moist air ahead of dry intrusion,and as a consequence,it promotes the cold vortex precipitation;On the other hand,the forward moving of the descending cold air makes its front interface more steep and the atmospheric stratification instable,which helps to promote the vertical devel-opment of rain clouds.The cold voltex precipitation mainly concentrates below the central section of the rain clouds.
出处
《气象》
CSCD
北大核心
2014年第5期562-569,共8页
Meteorological Monthly
基金
国家科技支撑计划课题(2012BAC23B01)
国家重点基础研究发展规划项目(2012CB955204)共同资助
关键词
东北冷涡
数值模拟
干空气入侵
降水
northeast cold vortex(NECV)
numerical simulation
dry intrusion
precipitation
