Satellite data reveal southwestern Tibetan plateau cooling since 2001 due to snow‐albedo feedback
Satellite data reveal southwestern Tibetan plateau cooling since 2001 due to snow‐albedo feedback
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DOI：
10.1002/joc.6292
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发表时间：
2019-09
期刊：
影响因子：
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通讯作者：
Donglin Guo;Jianqi Sun;Kun Yang;N. Pepin;Yongming Xu;Zhiqing Xu;Huijun Wang
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;Zhiqing Xu;Huijun Wang
由于气候变化对青藏高原（TP）固体水库构成的威胁，人们对了解气候变化的空间格局及其原因有很大的兴趣。气象站观测已被广泛研究，但稀缺，在整个TP，特别是在西部的气候变化的不完整的理解。使用最近（2001-2015）基于卫星的数据集（2米气温，地表温度，积雪和积雪），这项研究表明，在西南TP的年均2米气温下降了0.15°C/十年，而在TP的其余部分的整体变暖（+0.18 ° C/十年）。高达45%（74%）的变化，在每年（春季）2米的空气温度可以解释为同时变化的雪引起的对流在西南TP。该地区和印度西北部上空的自由大气柱正在冷却，为观测到的2米气温下降提供了有利的环境。此外，异常水汽输送到西南TP是有利的增加降雪和相关的降低2米的空气温度。全球变暖下的这种异常冷却的影响尚未得到充分考虑，特别是在西南TP喜马拉雅山脉的冰川和积雪的未来。
Given the threats that climate change poses to solid water reservoirs on the Tibetan plateau (TP), there is significant interest in understanding spatial patterns of climate change and their causes. Weather station observations have been extensively examined, but are scarce, resulting in an incomplete understanding of climate change across the TP, particularly in the west. Using recent (2001–2015) satellite‐based data sets (2 m air temperature, land surface temperature, albedo and snow cover), this study reveals that mean annual 2 m air temperature in the southwestern TP has decreased by 0.15°C/decade in contrast to overall warming (+0.18°C/decade) on the rest of the TP. Up to 45% (74%) of the variance in the annual (spring) 2 m air temperature can be explained by simultaneous change in snow‐induced albedo in the southwestern TP. The free atmosphere column over this region and Northwest India is cooling, providing a favourable environment for the decrease in 2 m air temperature observed. Moreover, the anomalous water vapour transport into the southwestern TP is advantageous for increased snowfall and the associated decrease in 2 m air temperature. The implications of this anomalous cooling under global warming have yet to be fully considered, in particular for the futures of glaciers and snowpack over the Himalayan Mountains in the southwestern TP.