旅顺地区一次冷流飘雪过程诊断分析

Diagnosis and Analysis of a Cold Flow Drifting Snow Process in Lvshun Area

东北冷涡的出现常常伴随着强降温,剧烈的降温容易使辽东半岛南部,尤其是旅顺地区发生冷流飘雪,冷流飘雪是冬季辽东半岛南部经常出现的天气现象。2022年11月30日,辽东半岛南部产生了一次冷流飘雪过程。本文通过对大气环流形势、水汽输送、大气稳定度以及大气垂直运动等进行分析,提出强冷空气与渤海暖水面相互作用产生的边界层不稳定为冷流飘雪提供了动力及水汽条件。

The appearance of the northeast cold vortex is often accompanied by strong cooling. Severe cooling is easy to cause a cold flow drifting snow in the southern part of the Liaodong Peninsula, especially in the Lvshun area. Cold flow drifting snow is a weather phenomenon that often occurs in the southern part of the Liaodong Peninsula in winter. A cold flow drifting snow process occurs in the southern part of the Liaodong Peninsula on November 30, 2022. Through the analysis of the atmospheric circulation situation, water vapor transport, atmospheric stability and atmospheric vertical movement, this paper proposed that the boundary layer instability caused by the interaction of strong cold air and the warm water surface of the Bohai Sea provides the dynamic and water vapor conditions for the cold flow drifting snow.