季节性积雪产生的融雪径流是中高纬度地区的主要淡水资源，其时空分布深刻地影响着当地人民的生活生产。而风吹雪是导致季节性积雪时空异质性的重要过程，通过质量迁移和吹雪升华过程在不同尺度上影响其分布演化。当前的陆面-大气耦合模型中通常假设每个网格区域上的地表和大气表面层可以看成是水平均匀的，然而在自然系统中，这些区域所包含的地表元素显然是不均匀的，而这些次网格变量对地表的动量、热量以及水分通量都具有重要的影响。本项目拟在小组现有的工作基础上，加入地表动态变化模块，结合野外观测、实验模拟、理论分析和数值模拟，建立包含完整物理机制的风吹雪两相流动力学模型，定量分析网格尺度内的风吹雪及其升华的规律，开发公里尺度风吹雪及其升华的参数化方案，为提高当前陆面-大气耦合模型的精度、开发新一代的高分辨率陆面-大气耦合模型提供支持。

The snowmelt runoff produced by seasonal snow cover is the main fresh water resource in the middle and high latitude area, and its temporal and spatial distribution has a profound impact on the local people's life and production. Wind blowing snow is an important process leading to temporal and spatial heterogeneity of seasonal snow, which affects its distribution and evolution on different scales through mass transfer and sublimation. In the current coupled land-atmosphere model, it is generally assumed that the surface and atmospheric surface layer on each grid area can be regarded as horizontal uniform. However, in the natural system, the surface elements contained in these areas are obviously uneven, which these sub-grid variables have an important impact on the momentum, heat and water flux of the surface. On the basis of the existing work of the group, this project plans to add the dynamic change module of surface, and combine the field observation, experimental simulation, theoretical analysis and numerical simulation, to establish a dynamic two-phase flow model of wind blowing snow including the complete physical mechanism. Then use the model to quantitatively analyze the law of the wind blowing snow and its sublimation in the grid scale, and develop a parameterized scheme of the wind blowing snow and its sublimation in the kilometer scale. This research work will provide support to improve the accuracy of the current coupled land-atmosphere models and the development of new generations of high-resolution coupled land-atmosphere model.