乌鲁木齐河源雪密度观测研究  

A STUDY ON THE SNOW DENSITY IN THE HEAD AREA OFURUMQI RIVER BASIN

作　　者：杨大庆[1] 张寅生[1] 张志忠[1] 

机构地区：[1]中国科学院兰州冰川冻土研究所

出　　处：《地理学报》1992年第3期260-266,共7页Acta Geographica Sinica

基　　金：国家自然科学基金资助项目

摘　　要：乌鲁木齐河源高山区积雪形成期(10月)积雪层的月平均密度为140kg/m^3,稳定积雪前期(11—2月)和稳定积雪后期(3—4月)雪层的月平均密度分别为190—210kg/m^3和175kg/m^3,非稳定积雪期(5—9月)的新雪密度介于90—125kg/m^3,平均值为112kg/m^3。统计分析表明,冬季积雪层的平均密度不随积雪深度而变化,但与5日平均气温和5日合计降水量呈反相关关系,夏季新雪的密度随雪深的增大而上升,风速对冬季积雪层平均密度和夏季新雪密度均无明显影响作用。The profile averaged snow density in the high alpine area of Urumqi river basin is 140 kg/in3 in the period of the formation of deposit snow during early winter (Oct.), It grows to 190210 kg/m3 in the early period of stable snow cover during the middle winter (Nov.-Feb.) and reduces to 175kg/m3 in the late period of stable snow cover during late winter and early spring (Mar.Apr.). During the snow free period (May.桽ept.) the density of new-snows ranges from 90 to 125 kg/m3, with an average of 112 kg/m3. Accordind to statistical ana-lysis, profile average snow density in winter does not relate to snow depth, and there is a ne-gative correlation between the snow density and the 5-day averaged air temperature and the corresponding sum of the precipitation. In the summer the density of newly fallen wet snow increases with the snow depth significantly. And wind speed has no effect on the density of both the deposited snow in winter and the new snow in summer.

关 键 词：高山区 积雪层 密度 观测 

分 类 号：P457.6[天文地球—大气科学及气象学]