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马琴, 刘新, 李伟平, 丁宝弘. 青藏高原夏季土壤有机质及砾石影响水热传输特性的数值模拟[J]. 大气科学, 2014, 38(2): 337-351. DOI: 10.3878/j.issn.1006-9895.2013.13119
引用本文: 马琴, 刘新, 李伟平, 丁宝弘. 青藏高原夏季土壤有机质及砾石影响水热传输特性的数值模拟[J]. 大气科学, 2014, 38(2): 337-351. DOI: 10.3878/j.issn.1006-9895.2013.13119
MA Qin, LIU Xin, LI Weiping, DING Baohong. Simulation of Thermal and Hydraulic Properties Affected by Organic and Gravel Soil over the Tibetan Plateau during Summer[J]. Chinese Journal of Atmospheric Sciences, 2014, 38(2): 337-351. DOI: 10.3878/j.issn.1006-9895.2013.13119
Citation: MA Qin, LIU Xin, LI Weiping, DING Baohong. Simulation of Thermal and Hydraulic Properties Affected by Organic and Gravel Soil over the Tibetan Plateau during Summer[J]. Chinese Journal of Atmospheric Sciences, 2014, 38(2): 337-351. DOI: 10.3878/j.issn.1006-9895.2013.13119

青藏高原夏季土壤有机质及砾石影响水热传输特性的数值模拟

Simulation of Thermal and Hydraulic Properties Affected by Organic and Gravel Soil over the Tibetan Plateau during Summer

  • 摘要: 本文针对青藏高原部分地区土壤有机质和砾石含量较高的特点,在前人工作的基础上,发展了一个新的参数化方案以描述土壤有机质和砾石对土壤导热率、导水率的影响。通过对通用陆面模式CoLM中的土壤水、热参数化方案以及地表蒸发阻抗三方面的逐步改进,对青藏高原藏东南站和纳木错站两种不同下垫面进行单点数值模拟分析。对比原方案与最终优化方案的模拟结果表明:采用新方案的CoLM模式对藏东南站土壤湿度模拟性能明显提高,平均偏差减小到0.04,而对纳木错站浅层20 cm以上土壤湿度的模拟偏差略微增大。新方案在藏东南站对土壤内部温度的模拟改善较为显著,平均偏差减小了0.2℃;而在纳木错站40 cm以上有所改进。新参数化方案较好地模拟了两个观测站表面能量通量的时间变化,纳木错站7、8月份的潜热通量改进尤为明显,比原方案减少大约20 W m-2,与观测结果较为接近。

     

    Abstract: The soil of some parts of the Tibetan Plateau contains an abundance of organic matter and gravel. On the basis of previous research, a new parameterization scheme has been developed to consider the influences of these material on soil thermal and hydrological conductivities. Sensitivity experiments conducted by using the Common Land Model to improve the parameterizations of soil temperature, hydraulic conductivities, and soil surface resistance are compared with simulation results from off-line numerical experiments reported by Southeast Tibet and Namco stations. By using the new parameterization scheme, the average deviation of the simulated soil moisture reported by the former station decreased by 0.04; however, the value showed a slight increase above the layer of 20 cm at the latter station. Although the average deviation of soil temperature, except at the surface, is decreased by 0.2℃ at the Southeast Tibet station, the biases decrease above the layer of 40 cm at the Namco station. With the new parameterization, the discrepancies of soil net radiation and surface sensible and latent heat fluxes are reduced. In particular, the surface latent heat flux at the Namco station in July and August is reduced by about 20 W m-2, which is closer to the observation value than that obtained by using the original parameterization.

     

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