主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

气象与环境学报 ›› 2018, Vol. 34 ›› Issue (2): 1-10.doi: 10.3969/j.issn.1673-503X.2018.02.001

• 论文 •    下一篇

基于WRF张弛方法的辽宁地区动力降尺度研究

易雪1, 李得勤2, 赵春雨1, 周晓宇1, 崔妍1, 侯依玲1   

  1. 1. 沈阳区域气候中心, 辽宁 沈阳 110166;
    2. 沈阳中心气象台, 辽宁 沈阳 110166
  • 收稿日期:2017-10-27 修回日期:2017-11-29 出版日期:2018-04-30 发布日期:2018-04-30
  • 通讯作者: 赵春雨,E-mail:springrainscn@163.com E-mail:springrainscn@163.com
  • 作者简介:易雪,女,1984年生,工程师,主要从事陆面过程,数据同化和气候模拟研究,E-mail:yi11xue@163.com。
  • 基金资助:
    中国气象局气候变化专项(CCSF201608)、国家自然科学基金(41675098)和辽宁省气象局博士科研专项(D201602)共同资助。

Dynamical climate downscaling over Liaoning area using nudging methods based on WRF model

YI Xue1, LI De-qin2, ZHAO Chun-yu1, ZHOU Xiao-yu1, CUI Yan1, HOU Yi-ling1   

  1. 1. Regional Climate Center of Shenyang, Shenyang 110166, China;
    2. Shenyang Central Meteorological Observatory, Shenyang 110166, China
  • Received:2017-10-27 Revised:2017-11-29 Online:2018-04-30 Published:2018-04-30

摘要: 动力降尺度被广泛的应用于区域气候降尺度工作中,用来制作高时空分辨率的区域气候场。本文采用WRF模式的张弛方法对美国第三代再分析资料(CFSR)进行了动力降尺度,使用观测张弛法同化自动气象站观测资料的同时,采用分析张弛法同化了大尺度再分析资料。选取辽宁省7月和10月作为夏季和秋季代表月份,分析不同降尺度方案对地面要素的模拟能力,发现使用张弛方法在区域气候降尺度过程中,可以明显提高地面2 m温度、10 m风速和2 m相对湿度的模拟能力,其中使用张弛算法同化大尺度的再分析资料和观测资料的准确度最高,相较于控制试验,7月和10月温度、风速和相对湿度的平均均方根误差分别减少了25%、39%和30%。

关键词: 区域气候场, WRF模式, 观测张弛, 分析张弛, 气候模拟

Abstract: Dynamical downscaling is widely applied in regional climate downscaling to generate regional climate fields with high spatial-temporal resolution.Using the nudging techniques based on the Weather Research and Fore-casting (WRF) model,Climate Forecast System Reanalysis (CFSR) data were dynamically downscaled over Liaoning province.The observational data from automatic weather stations were assimilated based on the observation nudging method and the large-scale reanalysis data were assimilated based on the analysis nudging method.Meteorological elements determined by different downscaling methods were compared with the observations in Liaoning province during July and October to test the accuracy of each method.The results indicated that the modelling capability of temperature at 2 m height,wind speed at 10 m height,and relative humidity at 2 m height is significantly improved using nudging methods in the regional climate downscaling process.The simulation performance be-comes even better after assimilating automatic weather station data and the large-scale reanalysis data based on the nudging methods,with the average root-mean-square error of temperature,wind speed,and relative humidity in July and October decreasing by 25%,39%,and 30% respectively.

Key words: Regional climate field, Weather Research and Forecasting (WRF) model, Observation nudging, Analysis nudging, Climate modeling

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