Indications of increasing land surface evaporation during the second half of the 20th century
Indications of increasing land surface evaporation during the second half of the 20th century
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DOI：
10.1029/2006gl027532
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发表时间：
2006-10
影响因子：
5.2
通讯作者：
W. Brutsaert
中科院分区：
文献类型：
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作者：
W. Brutsaert
人们普遍认为，在过去的半个世纪里，地球上许多地区的蒸发量一直在减少。但是，就陆地蒸发而言，这种消极趋势的意义仍然有些争议，其对全球水文循环的影响仍然不清楚。争论源于另一种观点，即这些蒸发变化要么是由全球辐射变暗造成的，要么是由泛盘和陆地蒸发之间的互补关系造成的。实际上，这些因素不是相互排斥的，而是同时起作用的。从数量上表明，尽管全球变暗，但如果以目前可获得的数据记录的表面价值来衡量，观测到的蒸发皿蒸发量减少通常是这些区域陆地蒸发量增加的证据。这与美国几大河流流域的独立水文预算计算相一致，并可能进一步证明许多地区的水文循环正在加速。
It is generally agreed that the evaporation from pans has been decreasing for the past half century over many regions of the Earth. However, the significance of this negative trend, as regards terrestrial evaporation, is still somewhat controversial, and its implications for the global hydrologic cycle remain unclear. The controversy stems from the alternative views that these evaporative changes resulted, either from global radiative dimming, or from the complementary relationship between pan and terrestrial evaporation. Actually, these factors are not mutually exclusive but act concurrently. It is shown quantitatively that, if the presently available data records are taken at face value, despite global dimming, the observed decreases in pan evaporation are generally evidence of increased terrestrial evaporation in those regions. This is consistent with independent hydrologic budget calculations for several large river basins in the USA, and likely further evidence of an accelerating hydrologic cycle in many areas.