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

被引：27

作者：

Aoki, S. ^{[1
,2
]}

Yamazaki, K. ^{[2
]}

Hirano, D. ^{[1
,2
,3
]}

Katsumata, K. ^{[4
]}

Shimada, K. ^{[5
]}

Kitade, Y. ^{[5
]}

Sasaki, H. ^{[6
]}

Murase, H. ^{[5
]}

机构：

[1] Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido, Japan

[2] Hokkaido Univ, Grad Sch Environm Sci, Sapporo, Hokkaido, Japan

[3] Hokkaido Univ, Arctic Res Ctr, Sapporo, Hokkaido, Japan

[4] Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan

[5] Tokyo Univ Marine Sci & Technol, Tokyo, Japan

[6] Japan Fisheries Res & Educ Agcy, Yokohama, Kanagawa, Japan

来源：

SCIENTIFIC REPORTS | 2020年 / 10卷 / 01期

关键词：

SEA-LEVEL RISE; GLOBAL HEAT; LAND COAST; CIRCULATION; EAST; POLYNYA; BAY;

D O I：

10.1038/s41598-020-71290-6

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：7

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