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Simulated Effects of Cropland Expansion on Summer Climate in Eastern China in the Last Three Centuries

机译：最近三个世纪中国东部农田扩张对夏季气候的模拟影响

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摘要

To understand the effects of the land use/cover changes due to agricultural development on summer climate in Eastern China, four 12-year simulations using the WRF-SSiB model were performed. We found that agricultural development resulted in warming and rainy effects. In the middle to lower reaches of the Yellow River and the Yangtze River, the warming effects were approximately 0.6°C and resulted from increased surface net radiation and sensible heat fluxes. In Northeast China, the warming effects were very small due to increases in latent heat fluxes which resulted from the extensive conversion from grassland to cropland. The rainy effect resulted from increases in convective rainfall, which was associated with a warming surface in certain areas of the Yellow River and Yangtze River and a large increase in the surface moisture flux in Northeast China. Conversely, in the middle to lower reaches of the Yellow River and the Yangtze River, the grid-scale rainfall decreased because the climatological northward wind, which is moist and warm, was partially offset by a southward wind anomaly. These findings suggest that the agricultural development left footprints not only on the present climate but also on the historical climate changes before the industrial revolution.
机译：为了了解中国东部地区由于农业发展而引起的土地利用/土地覆盖变化对夏季气候的影响，使用WRF-SSiB模型进行了四个12年的模拟。我们发现农业发展导致了变暖和降雨。在黄河和长江中下游，变暖效应约为0.6°C，这是由于表面净辐射和显热通量增加所致。在中国东北，由于潜在的热通量增加而导致的变暖效应非常小，而潜在的热通量是由草地向农田的广泛转化而引起的。降雨的影响是由于对流降雨增加，这与黄河和长江某些地区的地表变暖以及东北地区地表水分通量的大量增加有关。相反，在黄河和长江中下游，由于湿润和温暖的北风气候被南风异常抵消，因此网格规模的降水减少了。这些发现表明，农业发展不仅在当前气候上留下了足迹，而且还在工业革命之前留下了历史气候变化。

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