CoLM模式对塔克拉玛干沙漠北缘陆面过程模拟评估及修正

doi:10.7522/j.issn.1000-694X.2018.00004

摘要/Abstract

摘要： 采用2011年3月22日至7月26日肖塘陆气相互作用观测资料测试了不同陆面参数对公共陆面模式（CoLM）模拟效果的影响。地表参数包括地表反照率（α）、地表比辐射率（ε）、空气动力学和热力学粗糙度（z_0m、z_0h）、零置位移（d）、热传输附加阻尼（kB^-1）。结果表明：感热通量H和地表温度T_g对地表反照率、动力学粗糙度和地表比辐射率比较敏感，对零置位移不敏感。通过观测资料获得的这些参数及kB^-1参数化方案均被用来替换原CoLM模式中相应值及参数化方案。CoLM模式基本上能较好地模拟净辐射R_n、感热通量H、地表土壤热通量G₀和地表温度T_g日变化特征，只是在日峰值及其峰值出现时间的模拟上不理想；而CoLM模式对该地区土壤湿度M的模拟效果非常不好。误差统计值Bias、SEE、NSEE表明优化参数后的CoLM模式使得R_n的模拟误差被降低4.21%（SEE），H的模拟误差被降低25.19%（Bias），T_g的模拟误差被降低33.33%（Bias）、10.45%（SEE）和25%（NSEE）。

关键词: 公共陆面模式(CoLM), 数值模拟, 塔克拉玛干沙漠

Abstract: In this study, observation data during 22 March to 26 July, 2011 were used to simulate the land-atmosphere flux and test the sensitivity of simulation by different surface land parameters, such as surface albedo(α), surface emissivity(ε), aerodynamic roughness length(z_0m), thermal roughness length(z_0h) and zero plane displacement(d). Sensitivity tests indicate that sensible heat flux(H) and soil temperature(T_g) are sensitive toα, z_0m, ε but d. The study site representes the desert underlying surface of the northern marginal zone of the Taklimakan Desert with shifting sand dunes. CoLM model can simulate the average variation of net radiation (R_n), soil heat flux(G₀), sensible heat flux(H) and surface soil temperate(T_g). Only in the peak values and peak time of diurnal variation are not ideal. However, CoLM model on soil moisture perform poor. Furthermore, the statistical errors Bias, SEE, NSEE of R_n, H, T_g decreased according to the improved model, particularly. In particular, the statistical errors SEE of R_n decreased 4.21% than default model; the statistical errors Bias of H decreased 25.19% than default model; the statistical errors Bias, SEE and NSEE of T_g decreased 33.33%, 10.45% and 25%.

Key words: Common Land Model(CoLM), numerical simulation, Taklimakan Desert

中图分类号:

P422.4

金莉莉, 李振杰, 何清, 刘永强, 买买提艾力·买买提依明, 辛渝. CoLM模式对塔克拉玛干沙漠北缘陆面过程模拟评估及修正[J]. 中国沙漠, 2018, 38(6): 1287-1302.

Jin Lili, Li Zhenjie, He Qing, Liu Yongqiang, Ali Mamtimin, Xin Yu. Evaluation on Modeling of Land-Atmosphere Interaction in the Northern Marginal Zone of Taklimakan Desert with CoLM and Correction[J]. Journal of Desert Research, 2018, 38(6): 1287-1302.

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