摘要
乌鲁木齐河源降水量的年相对变率为10％,夏季降水日数和时数均为各季之首,微量降水经常发生,降水量日变化为昼雨单峰型。实际观测表明,河源地区夏季系统天气降水量随海拔的上升而增加,直到冰川粒雪盆4030 m处。平均而言,从60年代至今,河源地区年降水量无明显增大或减小,然而其年际间的变化幅度及极差明显增大。
The relative variability of the annual precipitation ranges around 10%. Summer precipitation, with great precipitation days and hours, is much more than other seasons. Trace amount of precipitation frequently occures in summer. The dinual pattern of summer precipitation is characterized by the daytime concentrations. Measurements show an increase tendency of summer precipitation with the elevation along the river valley up to 4 030 m a. s. l. in the accumulation area of the glaciers. This is caused by systematic weather processes. On an average, annual precipitation in the source area of the river basin does not change significantly during 1960s and 1980s. However, the variation range of the annual precipitation series tends to increase apparently.
出处
《冰川冻土》
CSCD
北大核心
1992年第3期258-266,共9页
Journal of Glaciology and Geocryology
基金
国家自然科学基金资助项目
关键词
河源
降水
乌鲁木齐河
天山
river source, characteristics of precipitation
