Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas.
Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas.
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DOI：
10.1098/rsta.2022.0162
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发表时间：
2023-06-26
期刊：
影响因子：
5
通讯作者：
Tarling, Geraint A.
中科院分区：
文献类型：
--
作者：
Meredith, Michael P.;Abrahamsen, E. Povl;Alexander Haumann, F.;Leng, Melanie J.;Arrowsmith, Carol;Barham, Mark;Firing, Yvonne L.;King, Brian A.;Brown, Peter;Brearley, J. Alexander;Meijers, Andrew J. S.;Sallee, Jean-Baptiste;Akhoudas, Camille;Tarling, Geraint A.
南大洋上层淡水平衡通过调节密度分层和生物生产力，从而调节大气和海洋内部之间的热量和碳交换，对全球气候产生影响。因此，理解和量化随时间变化的淡水输入是很重要的，这是单独测量盐度的挑战。在这里，我们使用了2016年至2021年间沿着斯科舍海和威德尔海北部的样带收集的海水氧同位素，将淡水贡献与海冰和大气来源分开。2016年，威德尔海北部的海冰融化大幅增加，地表值在2016年至2018年期间增加了约2个百分点，海冰柱存量增加了约1至2米，这证明了海冰前所未有的退缩。2021年初，由于A68兆贝格的融水，南乔治亚岛附近的地表大气水浓度超过了4%；较小的冰山也可能在其他时间影响到大气水。这两种输入都突出了冰冻圈变化对上层海洋新鲜化的重要性；未来潜在的海冰退缩和冰山崩解的增加将加强这些淡水资源对海洋和气候的影响。这篇文章是讨论会议“南大洋的热量和碳吸收：技术现状和未来的优先事项”的一部分。
The Southern Ocean upper-layer freshwater balance exerts a global climatic influence by modulating density stratification and biological productivity, and hence the exchange of heat and carbon between the atmosphere and the ocean interior. It is thus important to understand and quantify the time-varying freshwater inputs, which is challenging from measurements of salinity alone. Here we use seawater oxygen isotopes from samples collected between 2016 and 2021 along a transect spanning the Scotia and northern Weddell Seas to separate the freshwater contributions from sea ice and meteoric sources. The unprecedented retreat of sea ice in 2016 is evidenced as a strong increase in sea ice melt across the northern Weddell Sea, with surface values increasing approximately two percentage points between 2016 and 2018 and column inventories increasing approximately 1 to 2 m. Surface meteoric water concentrations exceeded 4% in early 2021 close to South Georgia due to meltwater from the A68 megaberg; smaller icebergs may influence meteoric water at other times also. Both these inputs highlight the importance of a changing cryosphere for upper-ocean freshening; potential future sea ice retreats and increases in iceberg calving would enhance the impacts of these freshwater sources on the ocean and climate. This article is part of a discussion meeting issue ‘Heat and carbon uptake in the Southern Ocean: the state of the art and future priorities’.
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影响因子：
2.3
作者：
Brandon, MA;Murphy, EJ;Priddle, J
通讯作者：
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影响因子：
18.3
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影响因子：
5.2
作者：
Chen, Haidi;Haumann, F. Alexander;Talley, Lynne D.;Johnson, Kenneth S.;Sarmiento, Jorge L.
通讯作者：
Sarmiento, Jorge L.
DOI：
10.1016/s0967-0637(00)00093-5
发表时间：
2001-06-01
影响因子：
2.4
作者：
Mackensen, A
通讯作者：
Mackensen, A