Trends in streamflow, evapotranspiration, and groundwater storage across the Amazon Basin linked to changing precipitation and land cover
Trends in streamflow, evapotranspiration, and groundwater storage across the Amazon Basin linked to changing precipitation and land cover
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DOI：
10.1016/j.ejrh.2020.100755
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
B. P. Heerspink;A. Kendall;M. Coe;D. Hyndman
中科院分区：
文献类型：
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作者：
B. P. Heerspink;A. Kendall;M. Coe;D. Hyndman
研究区域研究区域是亚马逊河流域，它控制着全球重要的水和能源流动。研究重点面对不断变化的气候和景观，我们必须了解地表水资源如何变化、在哪里变化以及为什么变化。具体地说，我们必须考虑水循环的整体变化，以了解气候变化和景观变化对水资源的影响。在这项研究中，我们调查了整个亚马逊河流域水平衡的所有主要组成部分的变化。我们试图了解：1)土地覆盖和降水的变化如何影响径流，2)这些因素如何影响蒸散和地下水蓄水平衡成分，以及3)水平衡分配的变化如何反过来改变径流。新的水文学见解我们发现亚马逊盆地平均±9.5毫米/年的径流发生了显著变化。径流变化呈现空间变化格局，北部和西部流量增加，南部和东部流量减少。蒸散量增加了±29 mm/年，地下蓄水量增加了7.1 mm/年。总而言之，这些结果表明，研究亚马孙流域的径流变化应考虑整个水收支的变化，包括整个盆地地下水储存的未得到充分研究的方面。
Study regionThe study region is the Amazon River Basin, which controls globally important water and energy fluxes.Study focusIn the face of a changing climate and landscape, it is critical that we understand how, where, and why surface water resources are changing. Specifically, we must consider holistic changes to the water cycle to understand how water resources are affected by climate change and landscape alterations. In this study, we investigate changes to all major components of the water balance across the entire Amazon Basin. We seek to understand: 1) how changes to land cover and precipitation affect streamflow, 2) how these factors affect evapotranspiration and groundwater storage water balance components, and 3) how changes to the water balance partitioning may in turn alter streamflows.New hydrological insightsWe find significant changes to streamflow of ±9.5 mm/yr on average across the Amazon Basin. Streamflow alterations show a spatially variable pattern, with increasing discharge in the northern and western portions of the basin, and decreasing discharge in the southern and eastern basin. We also observe significant changes in evapotranspiration of ±29 mm/yr and groundwater storage increases of 7.1 mm/yr. Together, these results indicate that studies of streamflow change in the Amazon should consider changes to the whole water budget, including understudied aspects of groundwater storage across the Basin.