土地利用类型变化对兰州市大气边界层特征影响的数值模拟

利用3个不同时期土地利用资料,对2012年6月份兰州强迫大气背景下陆面特征的USGS、MODIS以及卫星反演资料分别进行数值模拟,并与土地利用类型变化对兰州边界层的影响进行了对比分析.结果表明,WRF模式在高分辨率（1 km）下,模拟积分稳定,数据改变前后能较好地模拟兰州市区大气边界层特征;土地利用类型的改变对中尺度的环流形势没有影响;温度场上山谷温度明显高于山区温度,表现为热岛效应,且高度越低强度越大;不断改变土地利用类型,代表城市化进程,影响城市边界层高度且其不断增加,改变地表能量特征且其不断增加,土壤湿度不断减少.

Numerical Simulation of the Impact of LUC on Characteristics of Atmospheric Boundary Layer in Lanzhou City

On the basis of the data of land use in three different period,this paper numerically simulated the characteristics of USGS,MODIS and satellite data about land surface of Lanzhou under the force of atmospheric background in June and compared the impact of land use changes （LUC） on the atmospheric boundary layer in Lanzhou City.The results showed that,under high resolution （1 kin）,the integral simulation of the WRF mode was more stable,the data before and after the change could better simulate characteristics of atmospheric boundary layer of Lanzhou City ; LUC had no effect on the condition of mesoscale circulation ; valley temperature significantly was higher than the mountains of temperature on the temperature field,showing the heat island effect,the lower the height,the greater the strength; constant changes of land use represent urbanization; LUC influenced the height of boundary layer and changed characteristics of surface energy,both the height of boundary layer and surface energy constantly increase,while the soil humidity constantly decreases.