山东半岛冷流强降雪和非冷流强降雪的对比分析

利用1981—2000年常规气象观测和NCEP/NCAR再分析资料，采用合成分析和动力诊断分析方法，对冷流强降雪与非冷流强降雪的空间分布、大气环流、水汽输送、稳定度和垂直运动进行对比分析。结果表明：冷流强降雪是发生在槽后西北气流里的中小尺度不稳定降雪，非冷流强降雪是发生在槽前西南气流中大尺度稳定性降雪。冷流强降雪具有明显的地方性特点，是强冷空气对下垫面物理状态强迫响应的结果。提出强冷空气与渤海暖水面相互作用产生的大气边界层不稳定是产生冷流降雪的本质，在这种边界层不稳定层结中发生的降雪是冷流降雪的概念。

Comparative Analysis of Cold Air Snowstorm and Non Cold Air Snowstorm in Shandong Peninsula

According to the conventional meteorological observation over the period 1981-2000 and NCEP/NCAR reanalysis data, coupled with synthetic analysis and power diagnostic analysis method, the paper illustrates the spatial distribution of cold air snowstorm and non cold air snowstorm, atmospheric circulation, vapor transportation, stability and vertical motion and does comparative analysis. The results indicate that cold air snowstorms are meso and micro scale snowfalls which occur in the northwest air flow behind trough, while the non cold air snowstorms tend to occur in southwest air flow in front of trough, usually large scale snowfalls. Cold air snowstorms have distinct local characteristics, resulting from the response of strong cold air to the physical condition of underlying surface. In addition, this paper proposes that the unstability of atmospheric boundary caused by the strong interaction of cold and warm waters of the Bohai Sea is the nature of cold air snowfalls, and the snowfalls occurring in such unstable stratification of boundary layer is the concept of cold air snowfalls.