区域大气模式中陆面子模式起转过程的研究

Research of spin-up processes of land surface model of RAMs fordifferent initial soil parameter

中文关键词:  HEIFE，RAMS，陆面模式，平衡态，起转过程

英文关键词:HEIFE, RAMS, Land surface model, Equilibrium state, Spin-up process

中文摘要:

      模式的起转过程(spin-up)是指在非平衡初值或扰动的条件下，模式进行调整而达到平衡态的过程。以黑河实验(HEIFE) 1991年6月20日到7月20日张掖站观测的地表能量通量和土壤温度资料为基础，用大量数值实验研究了RAMS (Regional Atmospheric Modeling System)陆面子模式起转过程所需的时间范围。数值实验中，为细致考虑土壤初始参数对此过程的影响，共设计了40余组不同的初始土壤水、热参数。通过模拟结果分析，把RAMS陆面模式起转过程的表现归纳为4大类，并说明了这个过程的持续时间可能因为土壤初始参数的不同而产生较大的差异，其范围可能为数小时至一周以上。在判断RAMS模拟地表、低空物理量时，土壤含水量是判断模式是否达到平衡态的重要因子。

英文摘要:

      Spin-up process is defined as the adjustment process of a model before it reaches an equilibrium state under the circumstance of given initial non-equilibrium or disturbed conditions. Based on the reanalysis data from NCEP (National Centers for Environmental Prediction) and the observation data of surface energy fluxes and soil temperature at Zhangye station in the HEIFE experiment conducted from 20 June to 20 July 1991, we studied the characteristics and time range of spin-up processes in the land surface model of RAMS (Regional Atmospheric Modeling System). To estimate the influence of initial soil moisture and temperature on spin-up process, we designed more than 40 sets of initial soil parameters. After analyzing simulation results, we conclude that there are four kinds of typical spin-up behaviors, and the time required for the model to reach an equilibrium state varies greatly with different initial soil parameters, ranging from several hours to more than one week. Soil moisture content is a very important factor in estimating whether the land surface model has reached an equilibrium state or not. Our conclusion is useful for model runners to judge whether their model has reached an equilibrium state, and thus beneficial to improve the accuracy of meso-scale model.