Impact and Sensitivity Analysis of Gravel Parameterization on Simulation of Land Surface Processes on the Qinghai-Xizang Plateau

  • Cuili MA ,
  • Shihua Lü ,
  • Yongjie PAN ,
  • Xuewei FANG ,
  • ZhaoGuo LI ,
  • Ting WANG
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  • <sup>1.</sup>Chengdu University of Information Technology,Chengdu 610225,Sichuan,China;<sup>2.</sup>Baotou Meteorological Bureau,Baotou 014030,Inner-Mongolia,China;<sup>3.</sup>Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,Jiang su,China;<sup>4.</sup>Key Laboratory of Land Surface Process & Climate Change in Cold and AridRegions,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;<sup>5.</sup>Sichuan Meteorological Disaster Prevention Technology Center,Chengdu 610072,Sichuan,China

Received date: 2019-10-22

  Online published: 2020-12-28

Abstract

The gravel parameterization scheme is added to the land surface model CLM4.5, which verifies the applicability of the new scheme in the model and the simulation effect of soil temperature and humidity is better than the original scheme.The simulation of the peak soil temperature and the valley value of soil water content is effectively improved.The new scheme was used to study the effect of different gravel content on the land surface process.The analysis found that the soil thermal conductivity increases with the increase of gravel content, which increases the endothermic (exothermic) heat of the deep soil in summer (winter) and increases (reduces) the simulated value.When the soil water content is large (small), the soil hydraulic conductivity increases (decreases) with the increase of the gravel content, which causes the simulated value of the soil water content to decrease (increased).At the same time, the increase of gravel reduces the simulation of deep soil temperature in winter, making more water in the deep layer become ice, further reducing the soil hydraulic conductivity, and causing the simulation of deep soil water content to decrease.Gravel changes the soil hydrothermal process, which affects the surface radiation flux and energy flux.The contribution of different gravel contents in each month was different, and the total contribution showed that the net soil radiation decreased with the increase of gravel content.

Cite this article

Cuili MA , Shihua Lü , Yongjie PAN , Xuewei FANG , ZhaoGuo LI , Ting WANG . Impact and Sensitivity Analysis of Gravel Parameterization on Simulation of Land Surface Processes on the Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2020 , 39(6) : 1219 -1231 . DOI: 10.7522/j.issn.1000-0534.2020.00005

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