大气科学2011，Vol.35Issue(3)：411-421,11.
中国冰冻日数的气候及变化特征分析
Climatic Characters and Changes of Ice-Freezing Days in China
摘要
Abstract
Climatic characters and changes of ice-freezing days in China are analyzed based on the daily rime and glaze observational dataset at 743 stations in China from 1954 to 2009. It is found that ice-freezing occurs mainly in Xinjiang, eastern Northwest China, eastern Inner Mongolia, Northeast China, North China, the Huaihe River valley and the region to the south of the Yangtze River, with the rime being almost in the southern part of China while the glaze in the northern part. Annual ice-freezing day generally ranges from 1 to 5 days and heavy ice-freezing regions scatter in northern Xinjiang, southern Shannxi, central Northeast China, eastern North China, Qinling mountain range, northeastern Yunnan, Guizhou, and so on. During 1954 to 2009, the ice-freezing days show a significant decreasing trend and an abrupt charge point is observed in the early 1990s, with the decreasing amplitude of rime days greater than that of glaze days. This decrease in ice-freezing days has close relevance with the obvious increase in the temperature and decrease in the relative humidity and the wind speed. Additionally, the ice-freezing days are closely related to the extent and intensity of Asian polar vortex, the intensity of the Ural blocking high and the Baykal blocking high, as well as the extent, intensity and location of the western Pacific subtropical high. Further,during 1954- 2009, the extent and the intensity of Asian polar vortex decreased, and the Ural and Baykal blocking highs intensified, the extent and the intensity of the western Pacific subtropical high decreased while the subtropical high shifted more westward. These changes in general circulation may cause the significant decrease in ice-freezing (glaze, rime) days in China.关键词
冰冻/雨凇/雾凇/变化趋势/大气环流指数Key words
ice-freezing/glaze/rime/ climatic character/changing trend分类
天文与地球科学引用本文复制引用
王遵娅..中国冰冻日数的气候及变化特征分析[J].大气科学,2011,35(3):411-421,11.基金项目
国家自然科学基金资助项目40905036,国家科技支撑计划2007BAC29B06 （）
