关键词: 天气分型, 降水相态, 指标, 位势厚度

Abstract:

Based on surface conventional observation data and sounding data from January to March and November to December during 2003-2012 at Hunnan station of Shenyang, the weather circulation influencing Shenyang was classified into four patterns including the front of cold high pressure, Mongolia cyclone, North China-Yellow River cyclone and the inverted trough-Changjiang-Huaihe cyclone firstly, then on the basis of that, the identification criterions of different precipitation phase in winter of Shenyang were established. By comparing the identification criterions of different precipitation phase, it was found that there were significant differences in temperature and geopotential thickness for different precipitation phase under different weather patterns. The strength of cold air was strongest under the front of cold high pressure situation, and temperature was lower and geopotential thickness was thinner than those under other weather situations. However, temperature and geopotential thickness could be used to distinguish precipitation phase of the other three weather patterns quite well. It was more likely to distinguish precipitation phase with geopotential thickness than that with temperature only, especially the geopotential thickness between 700 hPa and 1 000 hPa. Finally, by comparing the identification criterions with the past work, though the identification criterion in this work was more close to the past, it was more conductive to distinguish precipitation phase and make more accurate prediction based on weather patterns.

Key words: synoptic patterns, precipitation phase, identification criterion, geopotential thickness