违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 Nudging方法对西北强降水过程的模拟试验研究-Numerical Simulation Study Using Nudging Method on the Process of Heavy Rain in the Northwest China
doi:  10.3878/j.issn.1006-9585.2017.16177
Nudging方法对西北强降水过程的模拟试验研究

Numerical Simulation Study Using Nudging Method on the Process of Heavy Rain in the Northwest China
摘要点击 185  全文点击 75  投稿时间:2016-09-26  最后修改时间:2017-04-21
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基金:  国家自然基金(41471034),中国气象局行业专项“我国北方干旱致灾过程及机理”(GYHY201506001),“西北干旱半干旱区域气候模式发展”(CCSF2014)
中文关键词:  西北降水 WRF模式  松弛逼近 水汽通量散度
英文关键词:  Northwest  precipitation, WRF  model, Nudging, Water  vapor flux  divergence
        
作者中文名作者英文名单位
李明妍LI Mingyan兰州大学大气科学学院
崔志强CUI Zhiqiang兰州大学大气科学学院
王澄海WANG Chenghai兰州大学大气科学学院
引用:李明妍,崔志强,王澄海.2017.Nudging方法对西北强降水过程的模拟试验研究[J].气候与环境研究
Citation:LI Mingyan,CUI Zhiqiang,WANG Chenghai.2017.Numerical Simulation Study Using Nudging Method on the Process of Heavy Rain in the Northwest China[J].Climatic and Environmental Research(in Chinese)
中文摘要:
      本文通过在WRF模式中运用松弛逼近方法(Nudging)同化NCEP-FNL资料,对中国西北地区夏季三次对流降水过程进行了模拟试验,检验了模式运用Spectral Nudging(SN)和Grid Nudging(GN)方案后对研究区域内降水过程的模拟性能。结果表明: SN和GN试验相对于控制试验,模拟的降水结果更接近于站点观测。在降水范围和量级的模拟效果上都有显著提高,且SN试验所得结果优于GN试验。两种方法在降水时段对近地面温度场和风场模拟效果的分析比较表明,GN试验较SN试验更接近观测;而相对于控制试验,700 hPa 基本量(风速和相对湿度)的增量场,SN试验较GN试验对降水模拟结果和实际更加吻合。特别地,相对于GN试验,SN试验模拟的水汽通量散度与降水变化较为吻合,因此700hPa的物理量场变量增量是降水模拟效果改善的主要原因之一。
Abstract:
      By using the method of Nudging in WRF model to assimilate FNL data, doing a simulation test on three convective rainfall processes in Northwest China, examining the ability of Spectral Nudging(SN) and Grid Nudging(GN) to simulate the precipitation in the study area. Results showed: SN and GN experiment have a significant increase on the extent and magnitude of precipitation, the simulation results are closer to station data after assimilation, and SN experiment results are better than GN experiment results. From the assimilation result of temperature and wind filed with two experiments in precipitation time, GN test is more close to the observation; Comparing the base variable (wind speed and relative humidity) of CTL test at 700hPa, the result of SN experiment is more consistent with the precipitation simulation result. In particular, comparing with GN , the result of water vapor flux divergence is more close with the precipitation change with the SN. The variable increment at 700hPa is one of the main reasons to improve the precipitation simulation.
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