天山乌鲁木齐河源高山区的降水特征  

Characteristics of Precipitation in the Source Area of the Urumqi River Basin

作　　者：杨大庆[1] 康尔泗[1] Felix Blumer 

机构地区：[1]中国科学院兰州冰川冻土研究所 [2]瑞士联邦理工学院地理研究所

出　　处：《冰川冻土》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

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.

关 键 词：河源 降水 乌鲁木齐河 天山 

分 类 号：P426.62[天文地球—大气科学及气象学]