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Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s

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Title: Reversal of freshening trend of Antarctic Bottom Water in the Australian-Antarctic Basin during 2010s
Authors: Aoki, S. Browse this author →KAKEN DB
Yamazaki, K. Browse this author
Hirano, D. Browse this author
Katsumata, K. Browse this author
Shimada, K. Browse this author
Kitade, Y. Browse this author
Sasaki, H. Browse this author
Murase, H. Browse this author
Issue Date: 15-Sep-2020
Publisher: Nature Research
Journal Title: Scientific reports
Volume: 10
Issue: 1
Start Page: 14415
Publisher DOI: 10.1038/s41598-020-71290-6
Abstract: The Antarctic continental margin supplies the densest bottom water to the global abyss. From the late twentieth century, an acceleration in the long-term freshening of Antarctic Bottom Waters (AABW) has been detected in the Australian-Antarctic Basin. Our latest hydrographic observations reveal that, in the late 2010s, the freshening trend has reversed broadly over the continental slope. Near-bottom salinities in 2018-2019 were higher than during 2011-2015. Along 170 degrees E, the salinity increase between 2011 and 2018 was greater than that observed in the west. The layer thickness of the densest AABW increased during the 2010s, suggesting that the Ross Sea Bottom Water intensification was a major source of the salinity increase. Freshwater content on the continental slope decreased at a rate of 58 +/- 37 Gt/a in the near-bottom layer. The decadal change is very likely due to changes in Ross Sea shelf water attributable to a decrease in meltwater from West Antarctic ice shelves for the corresponding period.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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