中文摘要：

一 18 年长(19932011 ) 从关口 de 土耳其宫廷的雪和气象学的变量的全面数据集，法国被用来在每个雪季节期间在降雪(雪老化) 以后与过去的时间分析短波宽带反照率的变化。雪反照率上的空气温度，雪表面温度和雪深度的效果被调查。基于空气温度的累积，有每天的超过几连续的天比 2.5 高意味着的一个索引 ? 牴慩?獵e

英文摘要：

An 18-year long （1993-2011） comprehensive dataset of snow and meteorological variables from Col de Porte, France is used to analyze the variation of shortwave broadband albedo with elapsed time after snowfalls （snow aging） during each snow season. The effects of air temperature, snow surface temperature and snow depth on snow albedo are investigated. An index based on the accumulation of air temperature over several consecutive days with daily mean higher than 2.5 ℃ is proposed to divide each snow-covered period into a dry and the following wet snow season when this index reaches 18 ℃. The results indicate that snow surface albedo decreases exponentially with time in both dry and wet snow seasons. Snow albedo reduction with snow aging is small at low surface temperature and the reduction rate increases with the rise of surface temperature. However, the reduction rate is widely scattered within the observed range of temperature, implying a loose relationship between snow albedo and snow surface temperature. Snow albedo in wet snow season is generally smaller and decreases faster than in dry snow season. For Col de Porte site, snow depths to effectively mask the underlying surface are 21 and 33 cm in dry and wet snow season respectively.