doi:  10.3878/j.issn.1006-9895.1807.18156
中国西部陆面过程次网格地形参数化的改进对区域气温和降水模拟的影响研究

Research on the Effects on Regional Temperature and Precipitation Simulation of Land Surface Subgrid Topographic Parameterization Improvement in Western China
摘要点击 76  全文点击 32  投稿时间:2018-04-26  修订日期:2018-07-13
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基金:  国家重点研发计划项目
中文关键词:  WRF模式  NOAH陆面模式  中国西部  次网格地形  气温  降水  地表能量平衡.
英文关键词:  WRF Model  NOAH LSM  Western China  Sub-grid Topography  Regional Climate  Surface Energy Balance.
                    
作者中文名作者英文名单位
陈广宇Chen Guangyu北京师范大学地理科学学部地表过程与资源生态国家重点实验室
韦志刚Wei Zhigang北京师范大学地理科学学部地表过程与资源生态国家重点实验室
董文杰Dong Wenjie
朱献
陈辰
刘雅静
郑志远
引用:陈广宇,韦志刚,董文杰,朱献,陈辰,刘雅静,郑志远.2019.中国西部陆面过程次网格地形参数化的改进对区域气温和降水模拟的影响研究[J].大气科学
Citation:Chen Guangyu,Wei Zhigang,Dong Wenjie.2019.Research on the Effects on Regional Temperature and Precipitation Simulation of Land Surface Subgrid Topographic Parameterization Improvement in Western China[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      地表作为大气模块的下垫面,为大气模块提供边界条件,地形对于模式结果的准确性起到至关重要的作用。现有的陆面过程模式在陆面同一格点内的次网格单元采用相同的大气强迫量,没有考虑细网格地形对格点内大气强迫量的影响,这关系到模式对气象要素和陆气交换量的模拟水平。本文在陆面模式NOAH处理次网格单元的同时,将输入的大气强迫量根据其与地形高度的关系进行修订,提出新的次网格地形的参数化方案,并引入到WRF模式中进行数值试验,通过3组数值模拟试验,与未改进的方案和细网格方案分析比较,探讨新参数化方案对WRF 模式模拟结果的影响。结果表明: 地形越复杂区域,次网格地形的影响越大。本文引入的新陆面次网格地形方案对天山山脉和昆仑山脉、以及青藏高原南部的地表气温的模拟得到了较大改善,模拟的地表气温在大范围区域内都更贴近细网格的试验。虽然新陆面次网格地形方案和细网格试验都对温度的模拟结果都有改善,但新陆面次网格地形方案对降水的模拟改善甚微,而细网格试验对降水模拟却有改进,这是由于细网格试验在陆面和大气格点都进行了细化,而新陆面次网格地形方案只考虑了陆面次网格的影响。具体来说,新陆面次网格地形方案对温度的模拟结果改进是通过改变地表向上长波和地表感热实现的。而细网格试验由于同时细化了大气和陆面的空间格点,对降水和温模拟的改进是通过综合改变地表能量平衡实现的。
Abstract:
      The surface of the earth as the underlying of the atmospheric module provides boundary conditions for the atmospheric model.The topography plays a crucial role in the accuracy of the model results. The current land surface model uses the same atmospheric forcing in sub-grid units within the same model grid, and does not consider the influence of sub-grid topography on atmospheric forcing variable, which is related to the simulation of meteorological elements and land-atmosphere exchanging. In this paper, the modification of Land Surface Subgrid Topographic Parameterization(LSSTP) is proposed ,the input atmospheric forcing variable is revised according to its relationship with the terrain height while the NOAH scheme is used to process the sub-grid elements. and then it was introduced into the WRF model for numerical experiments. Three groups of numerical simulation test were conducted to investigate the effect of this improvement on the simulation results of the WRF model. The results show that: The new LSSTP introduced in this paper has greatly improved the simulation of the surface air temperature in the Tianshan Mountains, the Kunlun Mountains, and the southern Qinghai-Tibet Plateau. The simulated surface air temperature is closer to the scheme of fine grid in a large area.Although the simulation results of temperature for both the new LSSTP and the test of fine grids have improved, the simulation of precipitation with the new LSSTP does not improve much. However, the test of fine grids has simulated the precipitation. The improvement is due to the fact that the test of fine grids has been refined on both land and atmospheric grids, while the new LSSTP only considers the effects of land subgrids. The simulation results of the temperature of the new LSSTP are improved by changing the surface upward long-wave flux and the surface sensible heat flux, while the test of fine grids has simultaneously refined the grids of atmosphere and land, the improvement of precipitation and temperature simulation is achieved by comprehensively changing the surface energy balance.
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