Identification of Ventilated and Submarine Glacial Meltwaters in the Amundsen Sea, Antarctica, Using Noble Gases
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Title
- Identification of Ventilated and Submarine Glacial Meltwaters in the Amundsen Sea, Antarctica, Using Noble Gases
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Author(s)
- Shin, DongYoub; Hahm, Doshik; Kim, Tae Wan; Rhee, Tae Siek; Lee, SangHoon; Park, Keyhong; Park, Jisoo; Kwon, Young Shin; Kim, Mi Seon; Lee, Tongsup
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Alternative Author(s)
- 권영신
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Publication Year
- 2022-09
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Abstract
- To delineate the glacial meltwater distribution, we used five noble gases for optimum multiparameter analysis (OMPA) of the water masses in the Dotson-Getz Trough (DGT), Amundsen Sea. The increased number of tracers allowed us to define potential source waters at the surface, which have not been possible with a small set of tracers. The highest submarine meltwater (SMW) fraction (~0.6%) was present at the depth of ~450 m near the Dotson Ice Shelf. The SMW appeared to travel beyond the continental shelf break along an isopycnal layer. Air-equilibrated freshwater (up to 1.5%), presumably ventilated SMW (VMW) and surface melts, was present in the surface layer (<100 m). The distribution of SMW indicates that upwelled SMW, known as an important carrier of iron to the upper layer, amounts for 29% of the SMW in the DGT. The clear separation of VMW from SMW enabled partitioning of meltwater into locally-produced and upstream fractions and estimation of the basal melting of 53 – 94 Gt yr-1 for the adjacent ice shelves, assuming that the SMW fractions represent accumulation since the previous Winter Water formation. The Meteoric Water (MET) fractions, consisting of SMW and VMW, comprised 24% of those derived from oxygen isotopes, indicating that the annual input from basal melting is far less than the inventory of meteoric water, represented by MET.
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ISSN
- 2296-7745
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/43256
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DOI
- 10.3389/fmars.2022.951471
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Bibliographic Citation
- Frontiers in Marine Science, v.9, 2022
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Publisher
- Frontiers Media S.A.
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Keywords
- glacial meltwater; noble gases; optimum multiparameter analysis; Amundsen Sea; basal melting; meteoric water
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Type
- Article
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Language
- English
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Document Type
- Article
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