不同下垫面数据和城市冠层参数化方案对江苏气温影响的个例分析  

Impact of different underlying surface data and urban canopy schemes on simulation of the temperature in Jiangsu: A WRF case study

作　　者：周晶[1,2] 刘蕾 霍飞[2] 鲍婷婷 ZHOU Jing;LIU Lei;HUO Fei;BAO Tingting(Jiangsu Meteorological Bureau,Nanjing 210008,China;Nanjing University of Information Science ＆ Technology,Nanjing 210044,China;IVuhu Meteorological Bureau,Anhui Wuhu 241000,China;Jiangsu Meteorological Information Center,Nanjing 210008,China)

机构地区：[1]江苏省气象局,南京210008 [2]南京信息工程大学,南京210044 [3]芜湖市气象局,安徽芜湖241000 [4]江苏省气象信息中心,南京210008

出　　处：《气象科学》2018年第3期342-350,共9页Journal of the Meteorological Sciences

基　　金：江苏省青年气象科研基金(Q201424)

摘　　要：利用中尺度数值模式WRF,分别选用新旧两种下垫面资料和不同城市冠层模型设计试验,以江苏一次秋末高温天气个例(2014年11月20—21日)为背景,研究城市化进程对气温的影响和可能机制。将模式结果与江苏国家气象观测站和地面加密区域自动站观测资料进行对比,并分析3组试验结果发现:(1)采用BEP城市方案对2 m气温、2 m相对湿度和10 m风速等物理量的日变化模拟最优。(2)相比USGS数据,MODIS较新地表覆盖变化数据能更真实反映研究区域当前地表类型分布情况,且能提高近地面风温湿要素空间分布的模拟。(3)分析不同试验模拟的地表能量平衡过程差异,发现相比UCM单层城市冠层方案,BEP多层城市冠层方案在白天能更好模拟出城市地区的温度升高以及相对应的地表感热通量和地面热通量的增加。Based on the observational data and ground encryption automatic station data of Jiangsu,Weather Research and Forecast model（ WRF V3.6.1） with different land use data and two urban canopy schemes is used to simulate the high temperature weather case of Jiangsu in 2014,and to assess the influence of urbanization process on temperature and its possible mechanism. The conclusions are summarized as follows：（ 1） The BEP test can better similar the distributions of air temperature at 2 m,2 m relative humidity and 10 m wind speed.（ 2） the land use data of MODIS can more truly response surface type distribution of the current research area,and can improve the simulation of spatial distribution of surface wind speed,temperature and relative humidity than the land use data of USGS.（ 3） Compared with the UCM single-layer urban canopy,the BEP urban canopy scheme can better simulate the urban heat island effect and the corresponding surface sensible heat flux and ground heat flux during the daytime by analyzing the energy balance processes of land surface of different experiments.

关 键 词：下垫面 城市冠层方案 区域气温 数值模拟 

分 类 号：P435[天文地球—大气科学及气象学]