成都市精细化数值模式研究及试验

本文在引入成都市精细化下垫面资料后将G rapes与城市冠层方案相耦合,并在此基础上进行数值试验。初步试验结果表明:该耦合模式能基本表现城市冠层的特征的作用,即能够较好地模拟出城市热岛效应。城市冠层参数化方案及精细化下垫面资料的引入能够影响陆气之间的相互作用,改变大气的能量平衡,致使向上长波辐射增强,感热通量增加,潜热通量减少。城市化效应白天对边界层大气的增温作用还会影响低层大气的层结结构,使之在午后产生弱的上升运动。

Study and Experiment on Resolution Numerical Model of Chengdu

By numerical experiment using the grapes modle introducing the refinement land-use data around Chengdu,which coupled with urban canopy parameterization scheme,we investigate the impact of refinement land use of Chengdu.Analyses show that,the coupled model can basically reflect the urban island effect.Urban canopy can influence interaction between land and atmosphere and change atmospheric energy balance which can cause long wave flux enhanced,sensible heat flux increased and the latent heat flux decreased.Urbanization effect can make the boundary-layer air's temperature increase by daylight,which would produced weak ascending motion in afternoon.