Subglacial-Discharge Plumes Drive Widespread Subsurface Warming in Northwest Greenland's Fjords
Subglacial-Discharge Plumes Drive Widespread Subsurface Warming in Northwest Greenland's Fjords
复制标题
冰下排放羽流导致格陵兰岛西北部峡湾广泛的地下变暖
DOI：
10.1029/2023gl103801
复制
发表时间：
2023
影响因子：
5.2
通讯作者：
Cowton T
中科院分区：
文献类型：
--
作者：
Cowton T
格陵兰岛的冰川峡湾调节着冰盖和海洋之间的交换。邻近冰川的冰下排放驱动的羽流可能对峡湾水的性质、海底冰川融化和冰川改性沃茨向大陆架的输出产生重要影响。在这里，我们使用数值羽流模型结合格陵兰西北部近14个冰川的观测，评估这些羽流对近冰川水特性的影响。我们发现，在夏末，从冰川羽流发出的沃茨往往弥补>50%的峡湾水组成在中间深度。这些羽流沃茨主要由上升的大西洋水组成，使近冰川水剖面变暖，并可能增加海底融化。我们的研究结果表明，羽流在推动格陵兰峡湾的水改造中发挥了关键作用，以及简单模型在一系列环境中捕捉这些影响的潜力。
Greenland's glacial fjords modulate the exchange between the ice sheet and ocean. Subglacial‐discharge‐driven plumes adjacent to glaciers may exert an important influence on fjord water properties, submarine glacier melting and the export of glacially‐modified waters to the shelf. Here we use a numerical plume model in conjunction with observations from proximal to 14 glaciers in northwest Greenland to assess the impact of these plumes on near‐glacier water properties. We find that in late summer, waters emanating from glacial plumes often make up >50% of the fjord water composition at intermediate depths. These plume waters are comprised largely of upwelled Atlantic Water, warming the near‐glacier water profile and likely increasing submarine melting. Our findings demonstrate the key role played by plumes in driving water modification in Greenland's fjords, and the potential for simple models to capture these impacts across a range of settings.