近三十年在中国东部地区发生了大范围的农业开垦、森林砍伐、城镇扩张等类型的土地利用变化。在本研究中，我们使用WRF模式耦合Noah-MP陆面模式，使用基于Landsat-TM卫星数据的1980s和2000s的土地利用资料，进行了两组21年的（1980年至2000年）积分，通过计算两组试验的差异分析大范围植被变化对夏、冬季气候的影响。在分析土地利用变化对夏季、冬季气候的影响当中，为了排除大尺度大气环流对气候的影响，突出土地利用变化的影响，我们只统计了正常季风年的模拟结果，即只分析夏（冬）季风正常年土地利用变化对夏（冬）季气候的影响。通过分析WRF模式的模拟结果，我们发现，在夏季，土地利用变化导致东北、华北和华南区域的平均地表反照率分别增加了0.03、0.01和0.07，并导致地表净吸收太阳辐射分别减少了4.5 W m-2、1.4 W m-2、13.05 W m-2。在我国东北和华北区域，土地利用变化主要是由草地转变为耕地，导致了地表潜热通量较大的异常增加，分别增加了9.6 W m-2、7.3 W m-2，进而导致地表气温分别下降了0.5°C和0.3°C，同时伴随着地表感热通量的减少；而在主要发生了阔叶林到耕地转变的南方区域，地表潜热通量变化相对较小，导致地表气温变化不大。在北方区域大范围的气温降低会降低中国东部大陆和西北太平洋之间的海陆热力差异，导致我国北方区域的夏季风减弱，不利于梅雨锋的形成和北传，导致长江中下游（28–33°N，110–122°E）夏季降水降低了14 mm（约3%），而在我国南方区域（22–28°N，105–120°E）降水约增加了39 mm（约6%）。此外，中国北方区域的异常气温降低会降低大气低层等压面之间的厚度，导致北方区域对流层中低层的位势高度降低，在我国东北和朝鲜半岛（35–45°N，121–130°E）上空形成了异常的低压中心与气旋式环流，导致该区域的夏季降水增加了33 mm（约7%）。此外，靠近低压中心的黄河下游与山东半岛也有异常的降水增加。而在冬季，在发生了大范围的植被变化的三个区域都出现了地表反照率的异常升高，减小了地表吸收的太阳辐射，这点同夏季的情况相似。但冬季地表潜热通量变化不大甚至有小幅减小，导致地表气温变化不大。其中东北气温异常仅为-0.01°C，华北、华南区域内平均的气温异常分别为0.2°C、0.1°C。由于地表气温没有显著变化，也就无法影响海陆热力差异或者低层位势高度场，所以冬季大气环流场未发现明显的变化。相较于地表气温的异常，土地利用变化对冬季降水的影响更小，整个中国区域冬季降水的变化都在5 mm以内。

Eastern China has experienced substantial agricultural expansion and deforestation in recent decades. We modeled the influence of land use/cover changes (LUCCs) over eastern China on the regional climate using the Weather Research and Forecasting model with the Noah-multiparameterization land surface scheme. Two 21 year (1980–2000) experiments were performed using the same settings, except for the land use/cover data for the 1980s and the 2000s. In addition, compared with the effects of LUCCs on the climate over China, variations in the East Asian monsoon may conceal potential LUCCs signals in our results. To highlight the effects of LUCCs, only simulation results from normal monsoon years were analyzed. The results showed that in northern China, decreases in the surface air temperature of approximately 0.3–0.5°C and decreases (increases) in rainfall over the lower reaches of the Yangtze River valley (southern China, northeastern China, and the Korean Peninsula) of approximately 3% (6–7%) in the summer were associated with LUCCs in eastern China from the 1980s to the 2000s. The cooling effect in northern China, which was primarily attributable to an increase in the surface latent heat flux of approximately 7.3–9.6 W m-2, weakened the land-ocean thermal contrast, suggesting the presence of a weaker summer monsoon over eastern China. As a result, rainfall over the lower reaches of the Yangtze River valley tended to decrease in summer, and rainfall increased over the southern China in summer. In addition, the cooling effect may have produced an anomalous cyclonic circulation from the surface to the mid-troposphere over northeastern China and the Korean Peninsula, resulting in increased rainfall over this area in summer. However, the simulated changes in surface air temperature and rainfall in winter were found to be insignificant.