Predicted Episode of Submarine Groundwater Discharge Onto the South Carolina, USA, Continental Shelf and Its Effect on Dissolved Oxygen
Predicted Episode of Submarine Groundwater Discharge Onto the South Carolina, USA, Continental Shelf and Its Effect on Dissolved Oxygen
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DOI：
10.1029/2022gl100438
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发表时间：
2022-12
影响因子：
5.2
通讯作者：
W. Moore;J. Vincent;James L. Pickney;Alicia M. Wilson
中科院分区：
文献类型：
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作者：
W. Moore;J. Vincent;James L. Pickney;Alicia M. Wilson
海底地下水排放（SGD）可能直接影响沿海底层水的溶解氧（DO）含量。在这里，我们报告了一次预测的 SGD 增强事件，该事件导致南卡罗来纳州大陆架的溶解氧浓度较低。预测模型将 SGD 事件与上升流有利风联系起来。数据显示，与典型的底层水值相比，这些水域的 226Ra 和 228Ra 含量高出 2-6 倍，并且溶解氧 (DO) 显着减少 (<130 μM)。这些数据的 228Ra:226Ra 紧密相关性与 2012 年 SC 附近的一次强烈缺氧事件期间的值相似。224Ra 和 223Ra 的水年龄表明该事件发生在采样前 2-9 天。预测的成功增加了上升流有利风（但不一定伴随上升流）与偶发 SGD 事件之间的相关性。这一根据风数据的预测代表了量化该地区 SGD 的重大进步。
Submarine groundwater discharge (SGD) may directly influence the dissolved oxygen (DO) content of coastal bottom waters. Here, we report a predicted episode of enhanced SGD that caused low DO concentrations on the South Carolina continental shelf. The prediction model linked episodes of SGD to upwelling‐favorable winds. The data revealed these waters were a factor of 2–6 higher in 226Ra and 228Ra compared to typical bottom water values and were significantly depleted in DO (<130 μM). The tight 228Ra:226Ra correlation of these data was similar to values during a strong hypoxic event off SC in 2012. Water ages from 224Ra and 223Ra indicated the event occurred 2–9 days before sampling. The success of the prediction lends added credence to the correlation of upwelling‐favorable winds—but not necessarily accompanied by upwelling—to episodic SGD events. This prediction from wind data represents a major advance for quantifying SGD in the region.