1961～2006年黑龙江省暴雪气候时空变化特征

Temporal and Spatial Variation Characteristics of the Snow Storms in Heilongjiang Province during 1961-2006

利用1961～2006年逐日降雪资料,分析了黑龙江省暴雪的时空特征及其变化趋势。结果表明:黑龙江省年暴雪分布具有东多西少、山地多平原少的特点;暴雪量和暴雪日数最多发生在季节转换的10月和次年3月,不在隆冬季节;暴雪强度5月和10月最大;全省平均暴雪量和暴雪日数存在不明显的上升趋势,上升主要发生在春季暴雪多发的东部山地;20世纪70年代末以来暴雪量和暴雪日数年际波动有所增大,进入21世纪以来暴雪发生频率和强度呈现明显增加的趋势。

Based on daily snowfall data during 1961-2006,temporal and spatial variation characteristics of snow storms in Heilongjinag Province,China,are investigated. The results show that snow storms in the eastern part of the province are more frequent than in the western part,and more snow storms are found in the mountainous areas than in the low-lying plain areas; the largest snow storm precipitation and frequencies occur in October and the next March,rather than in the mid winter; the largest snow storm intensity is in May and October of the transitional seasons; no significant linear trend of the snow storm frequencies in the past 46 years is found,though an insignificant increase occurs in the snow-prone eastern mountains in springtime; the variability of snow storm precipitation and frequencies significantly increase since the end of the 1970s. It is found that the snow storm frequencies and intensity obviously increase after 2000.