Climate Change and Teleconnections Amplify Lake Stratification With Differential Local Controls of Surface Water Warming and Deep Water Cooling
Climate Change and Teleconnections Amplify Lake Stratification With Differential Local Controls of Surface Water Warming and Deep Water Cooling
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DOI：
10.1029/2020gl090959
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发表时间：
2021-01
影响因子：
5.2
通讯作者：
I. Oleksy;D. C. Richardson
中科院分区：
文献类型：
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作者：
I. Oleksy;D. C. Richardson
温带湖泊正在经历变暖和分层持续时间的增加，而全球尺度的遥相关可能会加剧气候变化的影响。我们在美国纽约州的一个双相湖的长期每周数据集（1985-2017）中研究了年际表层和深层水温变化和分层物候。我们开发了一种称为混合作用的度量，以捕获分层期间的多个方面。我们发现表层沃茨变暖而深层海水变冷。地表增温与气温呈正相关。深水冷却与春季混合期长度和深水泉温度呈正相关，表明滞后效应。混合作用与全球气温异常和春季北大西洋涛动指数有关。随着夏季分层强度和长度的增加，像Mohonk这样的双胞型湖泊可能会继续向单胞型混合制度转变，夏季缺氧增加，湖泊生态地球化学，生产力和水生生物栖息地发生变化。
Temperate lakes are experiencing increases in warming and stratification duration while global‐scale teleconnections potentially exacerbate effects of climate change. We examined interannual surface and deep water temperature change and stratification phenology in a long‐term, weekly data set (1985–2017) from a dimictic lake in New York State, USA. We developed a metric, called mixing action, to capture multiple facets about the stratified period. We found warming in surface waters and cooling in deep water. Surface warming was positively correlated with air temperature. Deep water cooling was positively correlated with spring mixing period length and deep water spring temperature, indicating a lag effect. Mixing action was correlated with global temperature anomaly and spring North Atlantic Oscillation index. With increasing summer stratification strength and length, dimictic lakes like Mohonk may continue shifting toward monomictic mixing regimes with increasing summer hypolimnetic anoxia and changing lake biogeochemistry, productivity, and habitat for aquatic organisms.