Assessment of the methods for determining net radiation at different time-scales of meteorological variables  

作　　者：Ni An Sahar Hemmati Yu-Jun Cui 

机构地区：[1]Ecole des Ponts ParisTech,Laboratoire Navier/CERMES,6e8 av. Blaise Pascal,Cité Descartes,Champs sur Marne,77455 Marne la Vallée,France [2]Université Paris-Est,IFSTTAR,GERS,14e20 Boulevard Newton,Cité Descartes,Champs sur Marne,77447 Marne la Vallée,France

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2017年第2期239-246,共8页岩石力学与岩土工程学报（英文版）

基　　金：support of the European Commission by the Marie Curie IRSES Project GREAT-Geotechnical and Geological Responses to Climate Change:Exchanging Approaches and Technologies on a World-wide Scale(FP7-PEOPLE2013-IRSES-612665);the China Scholarship Council(CSC);Ecole des Ponts Paris Tech for their financial supports

摘　　要：When modeling the soil/atmosphere interaction,it is of paramount importance to determine the net radiation flux.There are two common calculation methods for this purpose.Method 1 relies on use of air temperature,while Method 2 relies on use of both air and soil temperatures.Nowadays,there has been no consensus on the application of these two methods.In this study,the half-hourly data of solar radiation recorded at an experimental embankment are used to calculate the net radiation and long-wave radiation at different time-scales(half-hourly,hourly,and daily) using the two methods.The results show that,compared with Method 2 which has been widely adopted in agronomical,geotechnical and geo-environmental applications.Method 1 is more feasible for its simplicity and accuracy at shorter time-scale.Moreover,in case of longer time-scale,daily for instance,less variations of net radiation and long-wave radiation are obtained,suggesting that no detailed soil temperature variations can be obtained.In other words,shorter time-scales are preferred in determining net radiation flux.When modeling the soil/atmosphere interaction,it is of paramount importance to determine the net radiation flux.There are two common calculation methods for this purpose.Method 1 relies on use of air temperature,while Method 2 relies on use of both air and soil temperatures.Nowadays,there has been no consensus on the application of these two methods.In this study,the half-hourly data of solar radiation recorded at an experimental embankment are used to calculate the net radiation and long-wave radiation at different time-scales(half-hourly,hourly,and daily) using the two methods.The results show that,compared with Method 2 which has been widely adopted in agronomical,geotechnical and geo-environmental applications.Method 1 is more feasible for its simplicity and accuracy at shorter time-scale.Moreover,in case of longer time-scale,daily for instance,less variations of net radiation and long-wave radiation are obtained,suggesting that no detailed soil temperature variations can be obtained.In other words,shorter time-scales are preferred in determining net radiation flux.

关 键 词：Energy balance Net radiation Different time-scales Meteorological data 

分 类 号：P412[天文地球—大气科学及气象学]