Amplified seasonal cycle in hydroclimate over the Amazon river basin and its plume region
Amplified seasonal cycle in hydroclimate over the Amazon river basin and its plume region
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DOI：
10.1038/s41467-020-18187-0
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发表时间：
2020-09-01
影响因子：
16.6
通讯作者：
Steffen, John D.
中科院分区：
文献类型：
--
作者：
Liang, Yu-Chiao;Lo, Min-Hui;Steffen, John D.
亚马逊河流域年降水量约为2000 mm，约占全球河流淡水输入量的17%，其水文气候变化对亚马逊羽流区（APR）的海洋生态系统产生深远影响，并对热带大西洋水文气候产生潜在的深远影响。在这里，我们表明，在1979年至2018年期间，亚马逊降水的季节性周期放大，以最大值和最小值之间的年度差异为代表，导致亚马逊河流量和APR海洋盐度的季节性增强。大气水分收支分析表明，这些增强的季节性循环与大气垂直和水平水分平流中类似的放大作用有关。使用全球气候模式的层次敏感性实验量化这些增强的季节性的关系。结果表明，一个加强的水文气候循环可能在亚马逊大气-陆地-海洋耦合系统中发展，有利于更极端的陆地和海洋条件。
The Amazon river basin receives similar to 2000 mm of precipitation annually and contributes similar to 17% of global river freshwater input to the oceans; its hydroclimatic variations can exert profound impacts on the marine ecosystem in the Amazon plume region (APR) and have potential far-reaching influences on hydroclimate over the tropical Atlantic. Here, we show that an amplified seasonal cycle of Amazonia precipitation, represented by the annual difference between maximum and minimum values, during the period 1979-2018, leads to enhanced seasonalities in both Amazon river discharge and APR ocean salinity. An atmospheric moisture budget analysis shows that these enhanced seasonal cycles are associated with similar amplifications in the atmospheric vertical and horizontal moisture advections. Hierarchical sensitivity experiments using global climate models quantify the relationships of these enhanced seasonalities. The results suggest that an intensified hydroclimatological cycle may develop in the Amazonia atmosphere-land-ocean coupled system, favouring more extreme terrestrial and marine conditions.