Evapotranspiration amplifies European summer drought
Evapotranspiration amplifies European summer drought
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DOI：
10.1002/grl.50495
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发表时间：
2013-05-28
影响因子：
5.2
通讯作者：
Spank, Uwe
中科院分区：
文献类型：
--
作者：
Teuling, Adriaan J.;Van Loon, Anne F.;Spank, Uwe
干旱通常与降水缺乏有关，而蒸散发和径流对干旱演变的贡献尚未得到很好的理解。本文利用中欧和西欧四个水源集水区独特的长期观测资料，重建了干旱期间的蓄水异常，并研究了干旱期间蓄水异常演变的驱动因素。我们为该地区的干旱悖论提供了观测证据：干旱期间蒸散发持续显著增加，这放大了储存异常。相比之下，径流的减少限制了存储异常。我们的研究结果强调了在干旱指数中正确表示蒸散发和径流过程的必要性。
Drought is typically associated with a lack of precipitation, whereas the contribution of evapotranspiration and runoff to drought evolution is not well understood. Here we use unique long-term observations made in four headwater catchments in central and western Europe to reconstruct storage anomalies and study the drivers of storage anomaly evolution during drought. We provide observational evidence for the drought-paradox in that region: a consistent and significant increase in evapotranspiration during drought episodes, which acts to amplify the storage anomalies. In contrast, decreases in runoff act to limit storage anomalies. Our findings stress the need for the correct representation of evapotranspiration and runoff processes in drought indices.