Moisture increase in response to high-altitude warming evidenced by tree-rings on the southeastern Tibetan Plateau
Moisture increase in response to high-altitude warming evidenced by tree-rings on the southeastern Tibetan Plateau
复制标题
青藏高原东南部的树木年轮证明了高海拔变暖导致的水分增加
DOI：
10.1007/s00382-016-3101-z
复制
发表时间：
2017-01-01
期刊：
影响因子：
4.6
通讯作者：
Yue, Pak Hong
中科院分区：
文献类型：
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作者：
Li, Jinbao;Shi, Jiangfeng;Yue, Pak Hong
全球高海拔地区已观察到快速变暖，但其对湿度变化的影响尚不完全清楚。本文利用树木年轮揭示了青藏高原东南部过去五个世纪以来常见的水分变化，并表明春末夏初（4-6月）的区域水分变化与青藏高原大范围的气温异常密切相关，水分增加与高温时期相一致。 1990-2000年代的最近一次雨势可能是过去五个世纪以来最潮湿的一次，这与过去千年青藏高原最温暖的时期相一致。动态分析表明，高原地表异常增温导致垂直空气对流增强，导致对流层低层湿度增加，高原东南部有效降水增加。树木年轮和动态分析中确定的一致的暖湿关系表明，在未来变暖的情况下，青藏高原东南部将普遍湿润。
Rapid warming has been observed in the high-altitude areas around the globe, but the implications on moisture change are not fully understood. Here we use tree-rings to reveal common moisture change on the southeastern Tibetan Plateau (TP) during the past five centuries, and show that regional moisture change in late spring to early summer (April–June) is closely related to large-scale temperature anomaly over the TP, with increased moisture coincident with periods of high temperature. The most recent pluvial during the 1990s–2000s is likely the wettest for the past five centuries, which coincides with the warmest period on the TP during the past millennium. Dynamic analysis reveals that vertical air convection is enhanced in response to anomalous TP surface warming, leading to an increase in lower-tropospheric humidity and effective precipitation over the southeastern TP. The coherent warm-wet relationship identified in both tree-rings and dynamic analysis implies a generally wetter condition on the southeastern TP under future warming.