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Considering the Fate of Evaporated Water Across Basin Boundaries-Implications for Water Footprinting

机译：考虑到盆地边界蒸发水的命运 - 对水脚印的影响

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Water consumption along value chains of goods and services has increased globally and led to increased attention on water footprinting. Most global water consumption is accounted for by evaporation (E), which is connected via bridges of atmospheric moisture transport to other regions on Earth. However, the resultant source-receptor relationships between different drainage basins have not yet been considered in water footprinting. Based on a previously developed data set on the fate of land evaporation, we aim to close this gap by using comprehensive information on evaporation recycling in water footprinting for the first time. By considering both basin internal evaporation recycling (BIER; ＞5% in 2% of the world's basins) and basin external evaporation recycling (BEER; ＞50% in 37% of the world's basins), we were able to use three types of water inventories (basin internal, basin external, and transboundary inventories), which imply different evaluation perspectives in water footprinting. Drawing on recently developed impact assessment methods, we produced characterization models for assessing the impacts of blue and green water evaporation on blue water availability for all evaluation perspectives. The results show that the negative effects of evaporation in the originating basins are counteracted (and partly overcompensated) by the positive effects of reprecipitation in receiving basins. By aggregating them, combined net impacts can be determined. While we argue that these offset results should not be used as a standalone evaluation, the water footprint community should consider atmospheric moisture recycling in future standards and guidelines.
机译：在全球范围内增加了商品和服务价值链的用水量，并导致水脚印增加了注意力。通过蒸发（e）占全球耗水量，通过大气水分运输的桥梁连接到地球上的其他地区。然而，在水脚印中尚未考虑不同排水盆之间的所得源 - 受体关系。基于以前开发的数据集在土地蒸发的命运上，我们旨在通过使用综合信息首次采用综合信息来缩小蒸发回收的蒸发。通过考虑盆地内部蒸发回收（Bier;> 2％的盆地中的5％）和盆地外部蒸发回收（啤酒; 37％的世界盆中的50％），我们能够使用三种水库存（盆地内部，盆地外部和跨界清单），暗示水脚印中的不同评估视角。在最近开发的影响评估方法上绘制，我们生产了评估蓝色和绿色水蒸发对所有评估视角的蓝色水可用影响的表征模型。结果表明，通过再沉淀在接收盆地的积极作用，蒸发在起源盆地中蒸发的负面影响是抵消（并部分过度的）。通过汇总它们，可以确定净冲击的组合。虽然我们认为这些抵消结果不应被用作独立评估，但水足迹群落应考虑在未来的标准和准则中考虑大气湿度。

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