Atypical Occlusion Process Caused by the Merger of a Sea-breeze Front and Gust Front  

作　　者：Abuduwaili ABULIKEMU XU Xin WANG Yuan DING Jinfeng WANG Yan 

机构地区：[1]Key Laboratory of Mesoscale Severe Weather(Ministry of Education),School of Atmospheric Sciences,Nanjing University [2]Tianjin Weather Modification Office

出　　处：《Advances in Atmospheric Sciences》2015年第10期1431-1443,共13页大气科学进展（英文版）

基　　金：supported by the National Research Fund for Public Welfare (Grant No.GYHY200906011);the National Key Technology R&D Program of China (Grant No.2009BAC51B01);the National Fundamental 973 Research Program of China (Grant No.2013CB430100)

摘　　要：An atypical occlusion process that occurred in North China on 14 July 2011 is studied based on both observations and a real-data Weather Research and Forecasting （WRF） model simulation. The results show that this atypical occlusion process was significantly different from the traditional, synoptic-scale occlusion process that occurs within extratropical cyclones. It was caused by the merger of two cold-type mesoscale fronts. One of the fronts developed from the gust front of convective storms, while the other was a sea-breeze front. As the two fronts moved towards each other, the warm air between them was squeezed and separated from the surface. An atypical occluded front was formed when the two fronts merged, with the warm air forced aloft. This kind of occlusion is termed a ＂merger＂ process, different from the well-known ＂catch-up＂ and ＂wrap-up＂ processes. Moreover, local convection was found to be enhanced during the merger process, with severe convective weather produced in the merger area.An atypical occlusion process that occurred in North China on 14 July 2011 is studied based on both observations and a real-data Weather Research and Forecasting （WRF） model simulation. The results show that this atypical occlusion process was significantly different from the traditional, synoptic-scale occlusion process that occurs within extratropical cyclones. It was caused by the merger of two cold-type mesoscale fronts. One of the fronts developed from the gust front of convective storms, while the other was a sea-breeze front. As the two fronts moved towards each other, the warm air between them was squeezed and separated from the surface. An atypical occluded front was formed when the two fronts merged, with the warm air forced aloft. This kind of occlusion is termed a ＂merger＂ process, different from the well-known ＂catch-up＂ and ＂wrap-up＂ processes. Moreover, local convection was found to be enhanced during the merger process, with severe convective weather produced in the merger area.

关 键 词：occlusion process sea-breeze front gust front MERGER 

分 类 号：P732[天文地球—海洋科学]