我国西北地区沙漠改良可能引起的辐射强迫及其气候效应

以辐射对流模式和区域气候模式为工具，采用虚拟试验的办法，对我国西北地区3种沙漠改良方案（退沙还草，退沙还田，退沙还林）可能产生的辐射强迫及其区域气候效应进行了数值模拟。结果表明：3种方案均能促使西北地区的干旱状况有所缓解，其中退沙还林方案的缓解效应最为明显，可以使得西北地区平均地面气压上升0．25hPa，地面气温降低0．52℃，降水强度增加0．60mm/d。3种方案引起的辐射强迫皆为正值，分别为2．28、2．84、6．79W/m^2，变化趋势与地面温度变化并不一致，表明对于下垫面改变造成的气候强迫而言，辐射强迫并非反映气候变化的较好指标。

The Potential Radiative Forcing and Climatic Effect due to Desert Amendment over Northwest China

Regional climate model (ReCM2) was applied to simulate the climatic effect of desert amendment over Northwest China by scenario experiment. Three schemes were designed, including the transformation of desert to grass land,agriculture land and forest land. The results of numerical simulations show that all the three schemes can release the aridfication in the northwestern part of china. The scheme of transforming desert to forest land can increase the average surface pressure( + 0.25 hPa) as well as precipitation rate( + 0.60 mm/day) and decrease the surface temperature( - 0. 52 1C ). The radiative forcing due to desert amendment is positive, which is about 2.28, 2.84 and 6.79 W/m2 for three schemes respectively. The variation of radiative forcing is not consistent with the change of air temperature, which suggests that radiative forcing is not a good index for measuring the climatic forcing induced by landuse change.