黄河源区草地农牧化对气候环境影响的数值模拟

 利用中尺度数值模式MM5,设计了一个控制试验和一个敏感性试验。模拟分析黄河源区草地农牧化对局地气候环境的影响,得到一些初步结论:在全球增暖的大背景下源区草地农牧化引起源区平均气温和地表温度升高,平均日较差增大；源区农牧区降水以增加为主,周围地区以减少为主；源区空气湿度、土壤湿度明显减小；地表径流增加,地下径流减小,增加的降水大部分随地表径流流失；农牧区感热通量增加,潜热通量减小,有效通量增加。源区植被改变对气候环境的影响状况不同于其他地区。

Numerical Simulation of Grassland Agricultural-Pastoralization Influencing Climatic Environment in Source Regions of Yellow River

The mesoscale numerical model MM5 was used to design a control experiment and a sensitive experiment for analyzing the influence of grassland agricultural-pastoralization on climatic environment. Some conclusions have been obtained: under the background of global warming the grassland agricultural-pastoralization brought about the average temperature and the ground temperature ascend, the average daily temperature difference increase in the source regions of Yellow River; the precipitation in agricultural-pastoralization area increased and that in neighboring area decreased; the air humidity and soil moisture decreased obviously; the surface runoff increased and underground runoff reduced; the increased precipitation flowed along with surface runoff; the sensible heat flux increased, the latent heat flux decreased in the agricultural-pastoralization area and the effective thermal fluxes increased. The influence of grassland agricultural-pastoralization on climatic environment in source regions of Yellow River differs from other districts.