Decreasing Groundwater Supply Can Exacerbate Lake Warming and Trigger Algal Blooms
Decreasing Groundwater Supply Can Exacerbate Lake Warming and Trigger Algal Blooms
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DOI：
10.1029/2021jg006455
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发表时间：
2021-09
期刊：
影响因子：
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通讯作者：
Ammar Safaie;E. Litchman;M. Phanikumar
中科院分区：
文献类型：
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作者：
Ammar Safaie;E. Litchman;M. Phanikumar
随着地下水枯竭成为全球现象，内陆湖泊生态系统正受到地下水供应减少的影响。虽然目前内陆湖泊表面迅速升温的趋势仍在继续，但深层沃茨可以抵御变化，这取决于地表水-地下水相互作用的性质。然而，这些相互作用对湖泊过程的影响尚未完全了解。在这里，我们调查的作用，耦合生物物理过程中的地下水在深，二分，地下水喂养的湖泊使用机械模型结合现场观测数据。虽然过量的营养物质输入是藻类水华最常见的原因，但在这里，我们表明，内陆湖泊中的藻类水华也可能是由于地下水供应减少而出现的，而所有其他因素保持不变。结果表明，减少地下水供应的湖泊，导致升高的地下水温度，提高藻类生长速度和藻类水华，和氧气耗尽，从而加剧了表面变暖的负面影响。我们的工作表明，全球地下水供应量下降可能会对内陆湖泊的水质产生显着的负面影响，加速水柱变暖和刺激藻类生长，特别是当地下水对湖泊系统的贡献与河流排放相比显着。这项工作为管理工作提供了见解，以提高依赖地下水的生态系统在面对外部压力时的恢复力。
As groundwater depletion becomes a global phenomenon, inland lake ecosystems are being impacted by decreasing groundwater supply. While the current trend of rapid surface warming of inland lakes continues, the deep waters can resist changes, depending on the nature of surface water — groundwater interactions. However, the effects of these interactions on lake processes are not fully understood. Here we investigate the role of groundwater on coupled biophysical processes in a deep, dimictic, groundwater‐fed lake using mechanistic models combined with data from field observations. Although excess nutrient inputs are the most commonly cited reason for algal blooms, here we show that algal blooms in inland lakes can also appear due to a decreasing groundwater supply while all other factors remain the same. Results indicate that decreasing groundwater supply to lakes leads to elevated hypolimnetic temperatures, enhanced algal growth rates and algal blooms, and oxygen depletion, thus exacerbating the negative effects of surface warming. Our work suggests that globally declining groundwater supplies may have a significant negative effect on water quality of inland lakes by accelerating water column warming and stimulating algal growth, especially when the groundwater contribution to the lake system is significant compared to riverine discharge. The work provides insights for management efforts to improve the resilience of groundwater‐dependent ecosystems in the face of external stressors.