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首页> 外文期刊>Atmosphere >Global Climate Responses to Land Use and Land Cover Changes Over the Past Two Millennia
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Global Climate Responses to Land Use and Land Cover Changes Over the Past Two Millennia

机译：过去两千年中全球气候对土地利用和土地覆被变化的响应

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摘要

A reconstructed land use/land cover change (LUCC) dataset was used with the Community Earth System Model (CESM) to conduct a climate sensitivity analysis over the past two millennia. Compared to a controlled experiment conducted with the CESM, the LUCC showed significant biogeophysical effects on global climate on multi-decadal to centennial time scales. The global annual mean temperature and precipitation show clear decadal and multi-centennial scale oscillations when the LUCC effect was considered in the CESM simulation. With increased crop acreage and decreased natural vegetation over the past two millennia, the reflected terrestrial solar radiation has increased and the net terrestrial radiation has decreased, leading to a decrease in the global annual mean temperature. Global annual mean precipitation has also decreased along with decreased evaporation and atmospheric humidity. Our simulation suggests that LUCC mainly influences convective precipitation and has little influence on large-scale precipitation. The impact of LUCC has latitudinal and seasonal differences. The largest response of temperature to LUCC has occurred in the middle latitudes of the Northern Hemisphere (NH), while the largest precipitation response occurred at lower latitudes of the NH. The responses of temperature and precipitation to LUCC is stronger in winter and spring than in summer and autumn.
机译：重建的土地利用/土地覆盖变化（LUCC）数据集与社区地球系统模型（CESM）一起用于进行过去两千年的气候敏感性分析。与使用CESM进行的对照实验相比，LUCC在数十年到一百年的时间尺度上显示出对全球气候的重大生物地球物理影响。当在CESM模拟中考虑LUCC效应时，全球年平均温度和降水显示出明显的年代际和百年尺度的振荡。在过去的两千年中，随着农作物面积的增加和自然植被的减少，反射的地面太阳辐射增加了，而地面净辐射却减少了，从而导致全球年平均温度下降。全球年平均降水量也随着蒸发和大气湿度的下降而下降。我们的模拟表明，LUCC主要影响对流降水，而对大规模降水影响不大。 LUCC的影响具有纬度和季节差异。温度对LUCC的最大响应发生在北半球（NH）的中纬度，而最大的降水响应发生在NH的低纬度。在冬季和春季，温度和降水对LUCC的响应要强于夏季和秋季。

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