Numerical Simulation of the Evolution of Snow Cover and Its Sensitivity Experiments

By using Comprehensive Land Surface Model (CLSM), three snow cases, i.e., France Col de Porte 1993/1994, 1994/1995 and BOREAS SSA-OJP 1994/1995, were simulated. The simulated results were compared with the observations to examine the capability of the model to describe the evolutions of snow cover under two different land cover conditions. Several sensitivity experiments were performed to investigate the effects of the parameterization schemes of some snow cover internal processes and vegetation on the model results. Results suggest that the CLSM simulates the basic processes of snow cover accurately and describes the features of snow cover evolutions reasonably, indicating that the model has the potential to model the processes related to the snow cover evolution. It is also found that the different parameterization schemes of the snowfall density and snow water holding capacity have significant effects on the simulation of snow cover. The estimation of snowfall density mainly impacts the simulated snow depth, and the underestimation (overestimation) of the snowfall density increases (decreases) the snow depth simulated significantly but with little effect on the simulated snow water equivalent (SWE). The parameterization of the snow water holding capacity plays a crucial role in the evolution of snow cover, especially in the ablation of snow cover. Larger snow water holding capacity usually leads to larger snow density and heat capacity by storing more liquid water in the snow layer, and makes the temperature of snow cover and the snow ablation vary more slowly.To a smaller snow water holding capacity, contrary is the case. The results also show that the physical processes related to the snow cover variation are different, which are dependent on the vegetation existed.Vegetation plays an important role in the evolution of soil-snow system by changing the energy balance at the snow-soil surface. The existence of vegetation is favorable to the maintenance of snow cover and delays the increase of underlying soil temperature.

作 者： CHEN Haishan SUN Zhaobo   作者單位： Key Laboratory of Meteorological Disaster and Environmental Variation KLME,Nanjing University of Information Science and Technology, Nanjing 210044  刊 名： 氣象學(xué)報(bào)（英文版）  SCI 英文刊名： ACTA METEOROLOGICA SINICA  年，卷(期)： 2005 19(2)  分類(lèi)號(hào)： P4  關(guān)鍵詞： snow cover   evolution   simulation   Comprehensive Land Surface Model (CLSM)   sensitivity experiment  

【Numerical Simulation of the Evolutio】相關(guān)文章：

NUMERICAL SIMULATION STUDY OF THE INNER-CORE STRUCTURES AND THE MECHANISM FOR INSHORE STRENGTHENING OF SOUTH CHINA SEA T04-27

Physically based simulation of Buddha Glory04-26

SolidWorks Simulation圖解應(yīng)用教程(七)04-26

IMPACTS OF CUMULUS PARAMETERIZATION AND RESOLUTION ON THE MJO SIMULATION04-27

Simulation Analysis of Indoor Gas Explosion Damage04-27

Generation and Application of Spatial Atmospheric Turbulence Field in Flight Simulation04-26

NUMERICAL EXPERIMENTS ON THE IMPACTS OF SEA SPRAY ON TROPICAL CYCLONES04-27

Isothermal study of effusion cooling flows using a large eddy simulation approach04-27

CORRECTION OF ASYMMETRIC STRENGTHENING OF QUIKSCAT WIND FIELD AND ASSIMILATION APPLICATION IN TYPHOON SIMULATION04-27

Numerical Approximation of a Reaction-Diffusion System with Fast Reversible Reaction04-26