Revisiting Recent Elevation‐Dependent Warming on the Tibetan Plateau Using Satellite‐Based Data Sets
Revisiting Recent Elevation‐Dependent Warming on the Tibetan Plateau Using Satellite‐Based Data Sets
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DOI：
10.1029/2019jd030666
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发表时间：
2019-08
期刊：
影响因子：
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通讯作者：
Donglin Guo;Jianqi Sun;Kun Yang;N. Pepin;Yongming Xu
中科院分区：
文献类型：
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作者：
Donglin Guo;Jianqi Sun;Kun Yang;N. Pepin;Yongming Xu
卫星数据具有广泛的区域覆盖范围和相对较高的空间分辨率，对于研究山地崎岖地形上的高程相关变暖（EDW）具有明显的优势。基于最近（2001-2015年）基于卫星的综合数据集（2米大气温度、地表温度、积雪、白天和夜间云量），本研究发现，尽管从2000米到4500米有所增加，但年平均2米大气温度增温率在4500米以上呈快速下降趋势。在海拔4500 m以上，升温速率的降低与目前大部分固体水资源所在的海拔高度一致。因此，它们的下降速度可能比之前想象的要慢。这些结果为理解极端高海拔环境下的EDW及其控制机制提供了重要证据。
Satellite data, characterized by extensive regional coverage and relatively high spatial resolution, have a distinct advantage for examining elevation‐dependent warming (EDW) across rugged topography in mountain regions where there are sparse in situ observations. Based on recent (2001–2015) comprehensive satellite‐based data sets (2 m air temperature, land surface temperature, snow cover, and daytime and nighttime cloud), this study finds that annual mean 2 m air temperature warming rates show rapid decrease above 4,500 m despite increasing from 2,000 to 4,500 m. This indicates a reversal in EDW at the highest elevations on the Tibetan Plateau, which is somehow different from the EDW derived from short‐term land surface temperature presented in earlier research. The decrease of warming rate above 4,500 m coincides with the elevation at which most of the current solid water resources reside. Thus, their decline may be less rapid than previously thought. Trends in nighttime cloud and snow cover are both correlated with patterns of EDW on the Tibetan Plateau, but the leading factor varies on an annual and seasonal basis. These results provide important evidence for understanding EDW and its controlling mechanisms in an extreme high‐elevation context.