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首页> 外文期刊>Journal of Applied Meteorology >Interrelationships among snow distribution, snowmelt, and snow cover depletion: implications for atmospheric, hydrologic, and ecologic modeling
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Interrelationships among snow distribution, snowmelt, and snow cover depletion: implications for atmospheric, hydrologic, and ecologic modeling

机译：积雪分布，融雪和积雪枯竭之间的相互关系：对大气，水文和生态模型的影响

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摘要

Local, regional, and global atmospheric, hydrologic, and ecologic models used to simulate weather, climate, land surface moisture, and vegetation processes all commonly represent their computational domains by a collection of finite areas or grid cells. Within.each of these cells three fundamental features are required to describe the evolution of seasonal snow cover from the end of winter through spring melt. These three features arc 1) the within-grid snow water equivalent (SWE) distribution, 2)the griceell melt rate, and 3) the within-grid depletion of snow-covered area. This paper defines the exact mathematical interrelationships among these three features and demonstrates how knowledge of any two of them allows generation of the third. During snowmelt, the spatially variable subgrid SWE depth distribution is largely responsible for the patchy mosaic of snow and vegetation that develops as the snow melts. Applying the melt rate to the within-grid snow distribution leads to the exposure of vegetation, and the subgrid-scale vegetation exposure influences the snowmelt rate and the grid-averaged surface fluxes. By using the developed interrelationships, the fundamental subgrid-scale features of the seasonal snow cover evolution and the associated energy and moisture fluxes can be simulated using a combination of remote sensing products that define the snow-covered area evolution and a submoclel that appropriately handles the snowmelt computation. Alternatively, knowledge of the subgrid SWE distribution can be used as a substitute for the snow-covered area information.
机译：用于模拟天气，气候，陆地表面湿度和植被过程的局部，区域和全球大气，水文和生态模型通常都通过有限区域或网格单元的集合来表示其计算域。在这些单元中，每个单元都需要三个基本特征来描述从冬季末到春季融化的季节性积雪的演变。这三个特征是：1）网格内雪水当量（SWE）分布; 2）格里塞尔融化率; 3）网格内雪域的耗竭。本文定义了这三个特征之间的确切数学相互关系，并演示了对其中任何两个特征的了解如何生成第三个特征。在融雪期间，空间可变的子网格SWE深度分布在很大程度上负责积雪的斑驳马赛克和随着融雪而形成的植被。将融化速率应用于网格内积雪分布会导致植被暴露，而亚网格规模的植被暴露会影响融雪速率和网格平均表面通量。通过利用已开发的相互关系，可以结合使用定义积雪区域演变的遥感产品和适当处理积雪的子分子，来模拟季节性积雪演变的基本亚网格尺度特征以及相关的能量和水分通量。融雪计算。或者，可以将子网格SWE分布的知识用作积雪区域信息的替代。

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