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Role of blowing snow in snow processes in Qilian Mountainous region

Research in Cold and Arid Regions 2014年第2期6卷 124-130页

作者： HongYi Li Jian Wang XiaoHua Hao Cold and Arid Region Environmental and Engineering Research Institute Chinese Academy of Sciences

Blowing snow is an important part of snow hydrologic processes in mountainous region, however the related researches were rare for the Qilian mountainous region where blowing snow is frequent. Using the observation dataset in 2008 snow season in Binggou wa- tershed in Qilian mountainous region, we systematically studied the energy and mass processes of blowing snow by field observation and model simulation. The results include the analysis of snow observation, the occurrence probability of blowing snow, blowing snow transport and blowing snow sublimation. It was found that blowing snow was obvious in high altitude region （4,146 m）, the snow redislribution phenomena was remarkable. In Yakou station in the study region, blowing snow was easily occurred in midwinter and early spring when no snowmelt, the blowing snow transport was dominated in this period; when snowmelt beginning, the occur- rence probability of blowing snow decreased heavily because of the increasing air temperature, melt, and refrozen phenomena. The blowing snow sublimation accounted for 41.5% of total snow sublimation at Yakou station in 2008 snow season.

关键词： blowing snow snow sublimation snow processes Qilian mountainous region

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snow depth simulated by BATS-SAST model and its improvement

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Research in Cold and Arid Regions 2010年第4期2卷 305-314页

作者： Kun Xia Yong Luo WeiPing Li Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China Laboratory for Climate Studies China Meteorological AdministrationBeijing 100081China Laboratory for Climate Studies China Meteorological AdministrationBeijing 100081China National Climate Center China Meteorological AdministrationBeijing 100081China

A BATS-SAST model was employed to simulate the snow processes in four snow cases of Sk_OJP 2001/2002, 2002/2003, 2003/2004 and Sk_HarvestJP 2003/2004 of Canada. At Sk_OJP site we modified the long-wave radiation and precipitation schemes. Considering the different interceptions between rain and snow and the effect of wind and canopy temperature on snow download, we improved the canopy interception model. At Sk_HarvestJP site we modified the snow cover fraction scheme. Results show that the model reasonably simulates the basic processes of snow cover. The modified model, which considers the part of the long-wave radiation and precipitation transmitted through the canopy at Sk_OJP site, can increase the simulation of snow depth which is closer to the observations. The improved canopy interception model, which influences the variation of snow depth under the canopy by changing canopy interception, is a great improvement on simulation of snow depth, especially on the ablation of snow cover. At Sk_HarvestJP site, there are obvious improvements on simulation of snow depth on the ablation of snow cover.

关键词： snow processes numerical simulation canopy interception

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