Demir Cansu, McClelland James W, Bristol Emily, Charette Matthew A, Cardenas M Bayani
Department of Earth and Planetary Sciences The University of Texas at Austin Austin TX USA.
Marine Biological Laboratory The Ecosystems Center Woods Hole MA USA.
Geophys Res Lett. 2024 Nov 28;51(22):e2024GL109142. doi: 10.1029/2024GL109142. Epub 2024 Nov 21.
Fresh submarine groundwater discharge (FSGD) can deliver significant fluxes of water and solutes from land to sea. In the Arctic, which accounts for ∼34% of coastlines globally, direct observations and knowledge of FSGD are scarce. Through integration of observations and process-based models, we found that regardless of ice-bonded permafrost depth at the shore, summer SGD flow dynamics along portions of the Beaufort Sea coast of Alaska are similar to those in lower latitudes. Calculated summer FSGD fluxes in the Arctic are generally higher relative to low latitudes. The FSGD organic carbon and nitrogen fluxes are likely larger than summer riverine input. The FSGD also has very high CO making it a potentially significant source of inorganic carbon. Thus, the biogeochemistry of Arctic coastal waters is potentially influenced by groundwater inputs during summer. These water and solute fluxes will likely increase as coastal permafrost across the Arctic thaws.
新鲜的海底地下水排放（FSGD）能够将大量的水和溶质从陆地输送到海洋。在占全球海岸线约34%的北极地区，关于FSGD的直接观测和了解非常稀少。通过整合观测数据和基于过程的模型，我们发现，无论阿拉斯加波弗特海沿岸岸边与冰结合的永久冻土深度如何，夏季该区域部分海岸的海底地下水排放（SGD）流动动态与低纬度地区相似。相对于低纬度地区，北极地区计算得出的夏季FSGD通量通常更高。FSGD中的有机碳和氮通量可能大于夏季河流输入量。FSGD还含有非常高的二氧化碳，使其成为无机碳的潜在重要来源。因此，北极沿海水域的生物地球化学在夏季可能受到地下水输入的影响。随着北极各地的海岸永久冻土融化，这些水和溶质通量可能会增加。
