Increases in Great Lake winds and extreme events facilitate interbasin coupling and reduce water quality in Lake Erie.
Increases in Great Lake winds and extreme events facilitate interbasin coupling and reduce water quality in Lake Erie.
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DOI：
10.1038/s41598-021-84961-9
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发表时间：
2021-03-11
影响因子：
4.6
通讯作者：
Zhao Y
中科院分区：
文献类型：
--
作者：
Jabbari A;Ackerman JD;Boegman L;Zhao Y
气候变化影响湖泊的物理和生物地球化学过程。我们显示，1980年至2018年8月，劳伦森五大湖与大气现象（大西洋多年代际振荡和多变量厄尔Niño/南方涛动）相关的地表水温度（~ 0.5°C十年- 1；> 0.2%年- 1）和波能（> 1年- 1；波能输送）显著增加。一种响应极端风的波浪能模式被确定为预测伊利湖流域间耦合的代理。这涉及到含有高总磷浓度的低温低氧水（溶解氧< 2 mg L−1）从季节性分层的中央盆地上涌到通常混合良好的西部盆地，与东流相反。对历史记录的分析表明，在过去40年里，由于流域间交换导致的缺氧事件在西部盆地有所增加（过去10年增加了43%），从而影响了世界上最大的淡水资源和渔业之一的水质。
Climate change affects physical and biogeochemical processes in lakes. We show significant increases in surface-water temperature (~ 0.5 °C decade−1; > 0.2% year−1) and wave power (> 1% year−1; the transport of energy by waves) associated with atmospheric phenomena (Atlantic Multidecadal Oscillation and Multivariate El Niño/Southern Oscillation) in the month of August between 1980 and 2018 in the Laurentian Great Lakes. A pattern in wave power, in response to extreme winds, was identified as a proxy to predict interbasin coupling in Lake Erie. This involved the upwelling of cold and hypoxic (dissolved oxygen < 2 mg L−1) hypolimnetic water containing high total phosphorus concentration from the seasonally stratified central basin into the normally well-mixed western basin opposite to the eastward flow. Analysis of historical records indicate that hypoxic events due to interbasin exchange have increased in the western basin over the last four decades (43% in the last 10 years) thus affecting the water quality of the one of the world’s largest freshwater sources and fisheries.
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