北疆积雪参数特征分析

Characteristics Analysis of Snow Parameters in Northern Xinjiang

采用2009年和2010年2月中旬雪深、分层积雪密度、含水率和温度野外调查数据,分析了北疆地区积雪参数属性特征,雪深—温度和密度—含水率的关系。①雪深达10 cm,雪土界面温度比积雪表面高3℃左右,超过10 cm,偏高6～10℃;雪土界面温度与积雪深度呈高度线性相关,积雪越深,保温作用越显著;②2010年1月以来,北疆地区多降雪天气,2月积雪深度比2009年同期雪深明显增加;③2010年2月,北疆地区积雪密度均值总体范围在0.15～0.272g/cm3,比2009年同期积雪密度0.087～0.225 g/cm3偏大;④在一定体积含水率间隔范围,积雪密度和体积含水率间呈线性相关。

By using snow depth, snow-layers density, water content and snow-layer temperature data of northern Xinjiang in mid-February of 2009 and 2010,this study analyzed the property features of snow parameters and their relationships. The results showed that, ①The temperature of snow-soil interface was about 3 ℃ higher than the snow surface when snow depth was 10 cm,so did 6-10 ℃ with snow depth more than 10 cm. There was a linear correlation between snow-soil interface temperature and snow depth; the deeper the snow cover,the more significant the holding thermal effect. ②With more snow weather in northern Xinjiang since January 2010,snow depth in February 2010 was significantly higher than that in 2009 over the same period. ③Mean snow density range of 0.15-0.272 g/cm^3 in February 2010 was higher than that in 2009 with snow density range of 0.087-0.225 g/cm^3 through Northern Xinjiang. ④In certain interval range of volumetric water content, the snow density linearly correlated with the volume water content.