辽西地区土地退化对局地温度影响的数值模拟

The Numerical Simulation of the Influence of Land Degradation on Local Temperature in the West of Liaoning Province

辽西地区近几十年来土地退化状况严重,许多地区已成为生态脆弱区。利用中尺度模式(MM5V3.5),选择2001年6月份气象观测资料,根据辽西地区土地退化的有关调查材料,对模式中的下垫面状况(landuse)进行改变,模拟在下垫面状况改变后,辽西地区和辽宁省的温度变化和感热通量、潜热通量变化。模拟结果表明:在对不同的下垫面状况进行改变后,土地退化地区的6月份的月平均气温将升高0.1～0.7℃,月平均地表温度将升高0.3～1.3℃;地面感热通量增大,潜热通量减小。对试验区内其他地区影响不大。

The situation in land degradation has become serious in the west of Liaoning province during the recent decades,and many districts have become ecologically vulnerable areas.The mesoscale model (MM5V3.5) was used to simulate the changes in temperature,sensible heat flux and latent heat flux by means of changing landuse according to the survey data about the land degradation in the west of Liaoning,and using the data in June,2001.Results show that the monthly averaged temperature of June will raise by 0.1～0.7℃ and monthly averaged surface temperature of June will raise by 0.3～1.3℃ at the degradation land area;the sensible heat flux will increase,while the latent heat flux will reduce after the underlying surface state being changed.