气象2012，Vol.38Issue(12)：1523-1531,9.
宁夏降雪日数的气候特征和环流结构
Climate Characteristics of Snowfall Day Numbers in Ningxia and Structure of Atmospheric Circulation
摘要
Abstract
Conventional observed data and the characteristic quantities of the atmospheric circulation wereused to analyze the climate characteristics of snowfall day numbers in Ningxia and the affecting atmospheric circulation during the period of 1961 to 2010 by the methods of the statistic analysis, correlation analysis, and maximum entropy spectrum. The results have shown that the snowfall day numbers of each grade occur- ring in Ningxia have two extreme values which appear in spring and autumn. In winter, the heavier the snowfall, the lower the frequency. The geographical distribution of snowfall day numbers in different seasons is relatively consistent and increases obviously from north to south in Ningxia. High frequency centers have a strong correlation with terrain features. The frequency of non-sustained 1 d snowfall is higher, and the lasted time decreases with the increasing of snowfall grades. The total day numbers of snowfall have decreased, the contributions of light snow, heavy snow and snowstorms have reduced, however, moderate snow has the opposite trend. Different grades of snowfall have different variations of short, medium and long period. Polar vortex in the Northern Hemisphere, index of the Tibetan Plateau, European-Atlantic pattern and Eurasian circulation (Asia circulation) are the main atmospheric circulation systems influencing snowfall day numbers in关键词
宁夏/降雪日数/气候特征/大气环流分类
天文与地球科学引用本文复制引用
丁永红,冯建民,马筛艳,郑广芬..宁夏降雪日数的气候特征和环流结构[J].气象,2012,38(12):1523-1531,9.基金项目
宁夏自然科学基金 （）
宁夏科技攻关项目（KGX12-0902）共同资助 （）
