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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

陈广宇 韦志刚 董文杰 朱献 陈辰 刘雅静 郑志远

陈广宇, 韦志刚, 董文杰, 朱献, 陈辰, 刘雅静, 郑志远. 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, 2019, 43(4): 846-860. doi: 10.3878/j.issn.1006-9895.1807.18156
引用本文: 陈广宇, 韦志刚, 董文杰, 朱献, 陈辰, 刘雅静, 郑志远. 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, 2019, 43(4): 846-860. doi: 10.3878/j.issn.1006-9895.1807.18156
CHEN Guangyu, WEI Zhigang, DONG Wenjie, ZHU Xian, CHEN Chen, LIU Yajing, and ZHENG Zhiyuan. Effects of Improvement of Land Surface Subgrid Topographic Parameterization on Regional Temperature and Precipitation Simulation in Western China[J]. Chinese Journal of Atmospheric Sciences, 2019, 43(4): 846-860. doi: 10.3878/j.issn.1006-9895.1807.18156
Citation: CHEN Guangyu, WEI Zhigang, DONG Wenjie, ZHU Xian, CHEN Chen, LIU Yajing, and ZHENG Zhiyuan. Effects of Improvement of Land Surface Subgrid Topographic Parameterization on Regional Temperature and Precipitation Simulation in Western China[J]. Chinese Journal of Atmospheric Sciences, 2019, 43(4): 846-860. 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

doi: 10.3878/j.issn.1006-9895.1807.18156
基金项目: 国家重点研发计划项目2016YFA0602701

Effects of Improvement of Land Surface Subgrid Topographic Parameterization on Regional Temperature and Precipitation Simulation in Western China

Funds: Found by Foundation:National Key Research and Development Program of China Grant 2016YFA0602701Found by Foundation:National Key Research and Development Program of China (Grant 2016YFA0602701)
  • 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网格内的次网格单元采用相同的大气强迫量,没有考虑次网格地形对网格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(Weather Research and Forecasting)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有较大改善,模拟的地表气温在大范围区域内都更贴近细网格方案。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网格都进行了细化,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网格,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。
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  • 收稿日期:  2018-04-26

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