An observational study of snow aging and the seasonal variation of snow albedo by using data from Col de Porte, France

查看全文 作　　者：Ajiao [1]Chen;Weiping [2,3]Li;Weijing [2,3]Li;Xin [4]Liu

机构地区：[1]Chinese Academy of Meteorological Sciences;[2]National Climate Center, China Meteorological Administration;[3]Laboratory for Climate Studies, China Meteorological Administration;[4]Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》索引2014年第59卷第34期,共9页

基　　金：supported by the Major National Scientific Research Project on Global Changes(2010CB951902);the National Natural Science Foundation of China(40975042 and41175005) 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 °C is proposed to divide each snow-covered period into a dry and the following wet snow season when this index reaches 18 °C.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 snowseason 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. 关键词：季节变化反照率口门老化法国空气温度表面温度积雪深度

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An observational study of snow aging and the seasonal variation of snow albedo by using data from Col de Porte, France

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