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Impact of land surface degradation in northern China and southern Mongolia on regional climate

机译：中国北方和蒙古南部土地表面退化对区域气候的影响

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Clear evidence provided by the singular valne decomposition (SVD) analysis to the normalized difference vegetation index (NDVI) and precipitation data identifies that there exists a sensitive region of vegetation-climate interaction located in the transitional zone over northern China and its surrounding areas, where the vegetation cover change has the most significant influence on summer precipitation over China/Comparison of reanalysis data with station data provides a good method to assess the impacts of land use change on surface temperature, the most obvious contribution of land use change may be to lead to notable warming over northern China in the interdecadal time scale. Based on the new statistical results, a high-resolution regional integrated environmental model system (MEMS) is employed to investigate the effects of land surface degradation over the transitional zone and its surrounding areas (northern China and southern Mongolia) on the regional climate. Land degradation results in the decreases in precipitation over northern and southern China, and the increase in between, and increased and decreased temperature over vegetation change areas and the adjacent to the south, respectively. Not only would it change the surface climate, but also bring the significant influence on the atmospheric circulation. Both the surface climate and circulation changes generally agree to the observed interdecadal anomalies over the last five decades. These integrated statistical and simulated results imply that land surface degradation over the transitional zone in northern China and its surrounding areas could be one of the main causes responsible for the climate anomalies over China, especially the drought over northern China.
机译：奇异谷分解（SVD）分析对归一化植被指数（NDVI）和降水数据的分析提供的明确证据表明，在中国北方及其周边地区的过渡带中，存在一个植被-气候相互作用的敏感区域。植被覆盖变化对中国夏季降水影响最大/再分析数据与台站数据的比较为评估土地利用变化对地表温度的影响提供了一种很好的方法，土地利用变化最明显的贡献可能是导致在年代际尺度上，中国北方出现明显的变暖。根据新的统计结果，采用高分辨率区域综合环境模型系统（MEMS）来研究过渡区及其周边地区（中国北部和蒙古南部）的地表退化对区域气候的影响。土地退化导致中国北部和南部降水减少，植被变化区和南部邻近地区之间的降水增加，温度升高和降低。它不仅会改变地表气候，而且还会对大气环流产生重大影响。在过去的五十年中，地表气候和环流变化通常都与观测到的年代际异常一致。这些综合的统计和模拟结果表明，中国北方及其周边地区过渡带的地表退化可能是造成中国气候异常，尤其是中国北方干旱的主要原因之一。

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