Recent intensification of Amazon flooding extremes driven by strengthened Walker circulation.
Recent intensification of Amazon flooding extremes driven by strengthened Walker circulation.
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DOI：
10.1126/sciadv.aat8785
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发表时间：
2018-09
期刊：
影响因子：
13.6
通讯作者：
Pattnayak KC
中科院分区：
文献类型：
--
作者：
Barichivich J;Gloor E;Peylin P;Brienen RJW;Schöngart J;Espinoza JC;Pattnayak KC
亚马逊地区最近极端洪灾的增加与大气东西向沃克环流的加强有关。亚马逊盆地是地球上最大的分水岭。虽然亚马逊水文循环的可变性自1990年代末以来一直在增加，但其根本原因仍然难以捉摸。我们使用亚马逊河的水位来量化极端事件的变化，然后分析其原因。尽管研究继续强调干旱，但近几十年来最大的变化是非常严重的洪水显著增加。洪水的增加与强烈的热带大西洋变暖和热带太平洋冷却导致的沃克环流加强有关。人为因素和自然因素共同导致的大西洋变暖加剧了大气环流的变化。洪水的异常增加是否会持续取决于热带海洋间温差的演变。
A recent increase in extreme flooding in Amazonia is linked to intensification of the atmospheric east-west Walker circulation. The Amazon basin is the largest watershed on Earth. Although the variability of the Amazon hydrological cycle has been increasing since the late 1990s, its underlying causes have remained elusive. We use water levels in the Amazon River to quantify changes in extreme events and then analyze their cause. Despite continuing research emphasis on droughts, the largest change over recent decades is a marked increase in very severe floods. Increased flooding is linked to a strengthening of the Walker circulation, resulting from strong tropical Atlantic warming and tropical Pacific cooling. Atlantic warming due to combined anthropogenic and natural factors has contributed to enhance the change in atmospheric circulation. Whether this anomalous increase in flooding will last depends on the evolution of the tropical inter-ocean temperature difference.
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