长江流域资源与环境 >> 2013, Vol. 22 >> Issue (12): 1627-.

• 生态环境 • 上一篇    下一篇

WRF模式中城市冠层参数化方案在重庆气象环境模拟中的性能比较

伍见军|王咏薇|朱彬|杜钦|高阳华   

  1. (1. 南京信息工程大学大气物理学院|江苏 南京 210044; 2.南京信息工程大学大气环境中心|江苏 南京 210044;3. 重庆气象科学研究所|重庆 401147; 4. 民航重庆空管分局|重庆401120)
  • 出版日期:2013-12-20

PERFORMANCE COMPARISON OF DIFFERENT URBAN CANOPY SCHEMES IN WRF MODEL UNDER CHONGQING METEOROLOGICAL SIMULATION

WU Jianjun1,4,WANG Yongwei2,3,ZHU Bin2,DU Qin3,GAO Yanghua3   

  1. (1.School of Atmospheric Physics,Nanjing University of Information Science and Technology,Nanjing 210044,China;2.Center on Atmospheric Environment,Nanjing University of Information Science and Technology,Nanjing 210044,China;3.Chongqing Institute of Meteorological Sciences|Chongqing 401147,China;4.Chongqing Air Traffic Management Subbureaus,Chongqing 401120,China
  • Online:2013-12-20

摘要:

目前,耦合在WRF模式中的城市冠层方案包括单层冠层方案(UCM)、多层冠层方案(BEP)以及考虑室内外大气能量交换的多层冠层方案(BEP+BEM)。以2006年高温伏旱天气为背景,典型的拥有高密建筑物的山地城市重庆为研究对象,采用高分辨率的GIS数据替换USGS地形数据,对WRF中的3种城市冠层方案进行了两天的模拟。结果表明:(1)在不采用城市冠层方案时模拟的气温场和风场效果较差,2 m气温模拟值与观测值的均方差达到32℃;(2)在10个城市站点2 m气温的模拟中,BEP+BEM、BEP、UCM方案与观测值的模拟值与观测值的均方差为13℃、14℃、21℃,UCM方案相对较差,BEP+BEM方案最好;(3)在10 m风速的模拟中,单层方案结果偏大,两种多层方案与观测值有较好的一致性,二者差别较小。3种方案都能模拟出大致的风向

Abstract:

The urban canopy parameterizations was developed substantially and was coupled to the mesoscale meteorological model successfully to study urban boundary layer processes in the last 20 years.Different studies showed that such parameterizations were sensitive to the urban canopy parameters that defined the urban morphology.At the same time,the urban canopy parameters were sensitive to the simulation performance,and highresolution surface data was helpful for the simulative effects.At present,the urban canopy schemes coupled to WRF model included Singlelayer (UCM) scheme,Building Environment Parameterization (BEP) scheme and Building Environment Model (BEP+BEM) scheme.BEP and BEP+BEM need to confirm more parameters and waste more time than UCM,but whether they can improve the simulative effects requires further investigation.Different from plain cities,the mountain cities have complex terrain and land surface characteristics,which cause great difficulties for studying the mountain cities by model.Is simulation performance of WRF model coupled with urban canopy schemes better than which is not?Which urban scheme is most applicable to simulate 2 m temperature and wind in Chongqing?This paper intends to solve the above problems.Taken the typical mountain city(Chongqing) as the research object,combined the highresolution GIS data (333*333 m),we used three different urban canopy schemes coupled to WRF model to simulate Chongqing highdensity buildings thermal environment for two days.The main results are as follows.(1)The simulated temperature and wind of WRF without urban canopy scheme had rather big difference with the observations,the RMSE between observation and simulation without urban canopy scheme of 2 m temperature reached 32℃.(2)Results of BEP+BEM scheme was the best and results of UCM scheme was the worst.The RMSE (between observation and simulation,in 10 urban stations) of BEP+BEM,BEP and UCM schemes were 13℃,14℃,21℃,respectively.(3)The difference of results of BEP and BEM+BEP scheme was tiny and the results showed good agreement with observations in simulation of windspeed at 10m,but deviation of that of UCM scheme was bigger.The results of winddirection at 10 m were satisfactory in three urban canopy schemes simulations

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