用于气候研究的雪盖模型参数化方案敏感性研究

为了得到一个适用于气候研究简化的季节性雪盖模式最佳方案,必须对雪盖内部的重要物理过程、其与上大气相互作用、相应模型的参数化方案和有关的参数选取以及模型的分层结构进行深入研究.利用作者的雪盖模型(SAST),对其中的一些关键性过程的有关参数化方案(如压实、相变、融化雪水流动及分层方案考虑等)及关键的参数(如雪面反照率、有效热传导系数及持水能力等)进行了分析和敏感性试验,得到若干有意义的结论,为雪盖模式改进提供有用的结论.

A Sensitivity Study of Parameterization Scheme in Snow Cover Model Used in Climate Research

In order to obtain an optimal seasonal snow scheme in climate studies, it is necessary to conduct deep and comprehensive studies. The sensitivity study should involve internal processes of seasonal snow cover and its interact with the atmosphere above as well as the parameterization schemes, which include many parameters with uncertainty, for the processes and interact, and corresponding physical model structure. By using the seasonal snow cover model (SAST) developed by the authors, several sensitivity studies have been conducted. The sensitivity study included the test of different parameterization schemes (such as compaction process, phase change and its effect, melted snow water process and scheme of layering snow pack) as well as of different parameter values (such as snow surface albedo, effective thermal conductivity and snow water holding capacity), which are all related to the important key physical processes. From the study, some meaningful results have been obtained, which will benefit to seasonal snow model improvement as well will be helpful for land surface process modeling in climate studies.