Improved Parameterization of Snow Albedo in WRF+Noah:Methodology Based on a Severe Snow Event on the Tibetan Plateau  

作　　者：Lian LIU Massimo MENENTI Yaoming MA Weiqiang MA 

机构地区：[1]Land-Atmosphere Interaction and its Climatic Effects Group,State Key Laboratory of Tibetan Plateau Earth System,Resources and Environment(TPESRE),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China [2]State Key Laboratory of Remote Sensing Science,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China [3]Delft University of Technology,Delft 2600AA,Netherlands [4]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [5]College of Atmospheric Science,Lanzhou University,Lanzhou 730000,China [6]National Observation and Research Station for Qomolongma Special Atmospheric Processes and Environmental Changes,Dingri 858200,China [7]Kathmandu Center of Research and Education,Chinese Academy of Sciences,Beijing 100101,China [8]China-Pakistan Joint Research Center on Earth Sciences,Chinese Academy of Sciences,Islamabad 45320,Pakistan

出　　处：《Advances in Atmospheric Sciences》2022年第7期1079-1102,共24页大气科学进展（英文版）

基　　金：the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA20060101);the Second Tibetan Plateau Scientific Expedition and Research program(STEP)(2019QZKK0103);the National Natural Science Foundation of China(Grant Nos.91837208,91637312,41830650,and 91737205);MOST High-Level Talent Grant No.G20190161018;the Chinese Academy of Sciences President’s International Fellowship Initiative Grant No.2020VTA0001;the Key Research Program of Frontier Sciences of Chinese Academy of Sciences(QYZDJ-SSW-DQC019);Key Research and Development Projects of the Ministry of Science and Technology(2018YFC1505701).

摘　　要：Snowfall and the subsequent evolution of the snowpack have a large effect on the surface energy balance and water cycle of the Tibetan Plateau(TP).The effects of snow cover can be represented by the WRF coupled with a land surface scheme.The widely used Noah scheme is computationally efficient,but its poor representation of albedo needs considerable improvement.In this study,an improved albedo scheme is developed using a satellite-retrieved albedo that takes snow depth and age into account.Numerical experiments were then conducted to simulate a severe snow event in March 2017.The performance of the coupled WRF/Noah model,which implemented the improved albedo scheme,is compared against the model’s performance using the default Noah albedo scheme and against the coupled WRF/CLM that applied CLM albedo scheme.When the improved albedo scheme is implemented,the albedo overestimation in the southeastern TP is reduced,reducing the RMSE of the air temperature by 0.7°C.The improved albedo scheme also attains the highest correlation between the satellite-derived and the model-estimated albedo,which provides for a realistic representation of both the snow water equivalent(SWE)spatial distribution in the heavy snowbelt(SWE>6 mm)and the maximum SWE in the eastern TP.The underestimated albedo in the coupled WRF/CLM leads to underestimating the regional maximum SWE and a consequent failure to estimate SWE in the heavy snowbelt accurately.Our study demonstrates the feasibility of improving the Noah albedo scheme and provides a theoretical reference for researchers aiming to improve albedo schemes further.

关 键 词：WRF MODIS severe snowfall albedo scheme SWE Tibetan Plateau 

分 类 号：P426.635[天文地球—大气科学及气象学] P407