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地球科学进展  2006, Vol. 21 Issue (12): 1339-1349    DOI: 10.11867/j.issn.1001-8166.2006.12.1339
研究论文     
冻土模式的改进和发展
李倩,孙菽芬
中国科学院大气物理研究所,LASG,北京 100029
Development of Frozen Soil Model  
Li Qian, Sun Shufen
LASG, Institute of Atmospheric Physics, CAS, Beijing 100029, China
 全文: PDF(232 KB)  
摘要:

本研究首先对当今常用的冻土模式进行了改进。以土壤总焓和土壤水总质量替代原来的温度和体积水含量作为方程预报量,使冰水相变速率项变为诊断量,避免了原冻土模式计算过程中由于冰水相变速率项预估的误差造成计算过程中的温度偏差。同时对该新形式模式所发展的诊断量方程组设计了合理省时的数值计算方案。实验表明,改进后模式的模拟结果与观测值有较好的吻合。此外,分析比较了目前常用的3种冻融方案的理论基础及模拟结果,发现基于热力学平衡态推导得到的包含土壤水势影响的参数化方案能很好地模拟土壤的冻融变化过程,不同的冻融方案会对土壤内的温度、水量及表面的感热和潜热模拟结果产生较大的影响。

关键词: 冻土模式新形式新的数值求解方案不同冻融相变方案    
Abstract:

In this paper, firstly, new version of frozen soil model is presented, in which the enthalpy and total volumetric water equivalent content in soil is used as predictive variables to replace the predictive variables of soil temperature and volumetric liquid water content in the current models respectively. It makes the required estimation of liquid-ice phase change rate in the current models unnecessary, and therefore avoids the introduction of the error in estimation of the phase change rate into the new model and in turn will improve the new version model in both speeding convergence of numerical iterative process and enhancing the model performance. At the same time, a numerical scheme is also developed for the diagnostic equations in the new version, which is very efficient for finding the true solution with a few iteration times. It's proved the numerical simulation results of the new version model are in good agreement with two field observed data. Besides, based on analyzing three schemes for soil freezing-thaw from theoretical view and comparing the numerical simulation results, it is found that the parameterization scheme, which takes the relation between moisture potential and temperature in soil derived from the equilibrium thermodynamics theory into consideration, can describe the freezing-thaw processes well. Numerical results have shown that different freezing-thaw parameterizations have greater influence on simulated soil temperature, water content, and latent and sensible heat fluxes at soil surface.

Key words: New numerical scheme    Different freezing-thaw parameterization.    New form of frozen soil model
收稿日期: 2006-10-11 出版日期: 2006-12-15
:  P642.14  
基金资助:

国家自然科学基金重点项目“有中国区域特色的新型陆面过程模型——CNISM的研制”(编号:40233034);面上项目“与陆面过程有重要相互作用的大尺度水文模型的发展研究”(编号:40575043)资助.

通讯作者: 孙菽芬(1940-),男,上海人,研究员,主要从事陆面过程模型发展研究.     E-mail: ssf@lasg.iap.ac.cn
作者简介: 李倩(1981-),女,贵州人,在读博士生,主要从事陆面过程冻土和雪盖模式研究.E-mail:qian@mail.iap.ac.cn
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引用本文:

李倩,孙菽芬. 冻土模式的改进和发展[J]. 地球科学进展, 2006, 21(12): 1339-1349.

Li Qian, Sun Shufen. Development of Frozen Soil Model  . Advances in Earth Science, 2006, 21(12): 1339-1349.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2006.12.1339        http://www.adearth.ac.cn/CN/Y2006/V21/I12/1339

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