The Effects of Land Cover Change on Regional Climate over the Eastern Part of Northwest China

A regional climate model （RegCM4） is em- ployed to investigate the impacts of land use/cover change （LUCC） on the climate over the eastern part of Northwest China （ENW） in the periods of 2001 and 2011. The re- sults indicated that the LUCC in ENW, which was char-acterized by desert retreat, reforestation, and farmland expansion, led to significant local changes in surface air temperature （within -0.3℃） and slight regional changes in precipitation （within -15%） in summer. In the desert retreat area, the net absorbed shortwave radiation had a greater influence than evaporative cooling, leading to increases in the daily mean and maximum temperature. Besides, the daily mean and maximum temperatures in- creased in the reforestation area but decreased in the farmland expansion area. As surface albedo showed no significant change in these regions, the temperature in- crease in the reforestation area can be attributed to a decrease in evaporation, while the opposite effect appears to have been the case in the farmland expansion area.

一个地区性的气候模特儿(RegCM4 ) 被雇用在 2001 和 2011 的时期在西北中国(ENW ) 的东方部分上在气候上调查陆地使用 / 盖住变化(LUCC ) 的影响。结果显示在 ENW 的 LUCC，被荒芜的撤退，重新造林，和农田扩大描绘，在表面空气温度导致了重要本地变化(在 0.3C 以内) 并且在降水的细微地区性的变化(在 15% 以内) 在里面夏天。在荒芜的撤退区域，网吸收了有的短波放射更大的影响导致比成为蒸气的冷却，在每天吝啬、最大的温度增加。而且，每天吝啬、最大的温度在重新造林区域增加了，但是在农田扩大区域减少了。当表面反照率没在这些区域显示出重要变化，重新造林区域的温度增加能在蒸发被归因于减少，当相反的效果看起来是在农田扩大区域的案例时。