Numerical Simulations of Local Circulation and Its Response to Land Cover Changes over the Yellow Mountains of China  

作　　者：王蝶 苗峻峰 张大林 

机构地区：[1]Key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing University of Information Science & Technology [2]Department of Atmospheric and Oceanic Science, University of Maryland, College Park

出　　处：《Journal of Meteorological Research》2015年第4期667-681,共15页气象学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(41030962);Program for Sci&Tech Innovation Team of Qinglan Project of Jiangsu Higher Educational Institutions

摘　　要：In this study, locat circulations and their responses to land use and land cover （LULC） changes over the Yellow Mountains of China are examined by using Weather Research and Forecast （WRF） model simulations of a selected case under weak-gradient synoptic conditions. The results show that mountain-valley breezes over the region are characterized by an intense upslope the northern slope during daytime. A convergence zone flow lasting for about 11 h （0600 1700 LST） along occurs at the mountain ridge and moves northwest- ward with time. During nighttime, wind directions are reversed, starting first at higher elevations. Three sensitivity experiments are conducted, in which the current land covers are replaced by grassland, mixed forest, and bare soil, respectively, while keeping the other model conditions identical to a control run. These sensitivity simulations are designed to represent the changes of LULC over the Yellow Mountains area during the past decades. The results show that changes in land cover could affect substantially land-surface and atmosphere interactions, the evolution of local circulations, and characteristics of the planetary boundary layer （PBL）. Significant differences are noted in horizontal winds, and sensible and latent heat fluxes. On the other hand, when the surface is covered by mixed forest, slight variations in local winds and surface variables are identified. The results appear to have important implications to urban planning and constructions as well as the transport of air pollutants over mountainous regions.In this study, locat circulations and their responses to land use and land cover （LULC） changes over the Yellow Mountains of China are examined by using Weather Research and Forecast （WRF） model simulations of a selected case under weak-gradient synoptic conditions. The results show that mountain-valley breezes over the region are characterized by an intense upslope the northern slope during daytime. A convergence zone flow lasting for about 11 h （0600 1700 LST） along occurs at the mountain ridge and moves northwest- ward with time. During nighttime, wind directions are reversed, starting first at higher elevations. Three sensitivity experiments are conducted, in which the current land covers are replaced by grassland, mixed forest, and bare soil, respectively, while keeping the other model conditions identical to a control run. These sensitivity simulations are designed to represent the changes of LULC over the Yellow Mountains area during the past decades. The results show that changes in land cover could affect substantially land-surface and atmosphere interactions, the evolution of local circulations, and characteristics of the planetary boundary layer （PBL）. Significant differences are noted in horizontal winds, and sensible and latent heat fluxes. On the other hand, when the surface is covered by mixed forest, slight variations in local winds and surface variables are identified. The results appear to have important implications to urban planning and constructions as well as the transport of air pollutants over mountainous regions.

关 键 词：Yellow Mountains local circulation land cover change 

分 类 号：P461[天文地球—大气科学及气象学]