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方法对中国西北强降水过程的模拟试验研究-A Numerical Simulation Study on Heavy Rain Processes in Northwest China Using the Nudging Method
doi:  10.3878/j.issn.1006-9585.2017.16177
Nudging方法对中国西北强降水过程的模拟试验研究

A Numerical Simulation Study on Heavy Rain Processes in Northwest China Using the Nudging Method
摘要点击 295  全文点击 222  投稿时间:2016-09-26  修订日期:2017-04-26
查看HTML全文   下载PDF   查看/发表评论  下载PDF阅读器
基金:  公益性行业(气象)科研专项(重大专项)GYHY201506001-4。
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 method  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, 甘肃省干旱气候变化及减灾重点实验室, 兰州 730000
崔志强CUI Zhiqiang兰州大学大气科学学院, 甘肃省干旱气候变化及减灾重点实验室, 兰州 730000
王澄海WANG Chenghai兰州大学大气科学学院, 甘肃省干旱气候变化及减灾重点实验室, 兰州 730000
引用:李明妍,崔志强,王澄海.2017.Nudging方法对中国西北强降水过程的模拟试验研究[J].气候与环境研究,22(5):563-573,doi:10.3878/j.issn.1006-9585.2017.16177.
Citation:LI Mingyan,CUI Zhiqiang,WANG Chenghai.2017.A Numerical Simulation Study on Heavy Rain Processes in Northwest China Using the Nudging Method[J].Climatic and Environmental Research(in Chinese),22(5):563-573,doi:10.3878/j.issn.1006-9585.2017.16177.
中文摘要:
      通过在WRF(Weather Research and Forecasting)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3次对流降水过程进行了模拟试验,检验了模式运用谱逼近(Spectral Nudging,SN)和格点逼近(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。在降水落区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。通过分析两个同化试验在降水时段的基本要素场(湿度、温度和风速)变化,在近地面层,GN试验模拟的风速和温度较SN试验更接近观测;但700 hPa上,SN试验中风速、风向、温度、湿度的增量场变化及分布同降水的模拟结果存在较好的对应关系。最后,从物理诊断量—水汽通量散度的空间垂直变化来看,SN试验中600 hPa和700 hPa的水汽通量散度的正负分布有效调节降水的空间分布,更逼近观测。因此700 hPa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:
      Numerical simulations with application of the nudging technique in the Weather Research and Forecasting (WRF) model to assimilate Final Operational Global Analysis data (FNL) were implemented to study three convective rainfall processes in Northwest China. Impacts of spectral nudging (SN) and grid nudging (GN) methods on precipitation simulation in this area were also examined. The result shows that the simulations of SN and GN experiments agree better with station-observed data compared with that of the control experiment. It is obvious that the simulation of distribution and magnitude of precipitation have been improved significantly in the two experiments with nudging, while the SN experiment results are better than that of the GN experiment. Analysis of differences in the basic meteorological elements (humidity, temperature, and wind speed) during the precipitation period simulated in the two assimilation experiments, it was found that the surface wind speed and temperature simulated by the GN experiment are closer to observations than that simulated by the SN experiment. However, the simulation of wind speed and relative humidity at 700 hPa and precipitation in the SN experiment are better than that in the GN experiment. Finally, from the perspective of the vertical variation of the diagnostic physical variable, i.e. water vapor flux divergence, the positive and negative distributions of water vapor flux divergence at 700 hPa and 600 hPa in the SN experiment effectively modulate the spatial distribution of precipitation and the simulation agrees well with observation. The increase of water vapor flux at 700 hPa is one of the major reasons for the improvement of precipitation simulation.
主办单位:中国科学院大气物理研究所 单位地址:北京市9804信箱
联系电话: 010-82995048,010-82995049传真:010-82995048 邮编:100029 Email:qhhj@mail.iap.ac.cn
本系统由北京勤云科技发展有限公司设计
京ICP备09060247号