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

被引：24

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

共 33 条

[1] Widespread freshening in the Seasonal Ice Zone near 140°E off the Adelie Land Coast, Antarctica, from 1994 to [J].

Aoki, S. ;

Kitade, Y. ;

Shimada, K. ;

Ohshima, K. I. ;

Tamura, T. ;

Bajish, C. C. ;

Moteki, M. ;

Rintoul, S. R. .

JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2013, 118 (11) :6046-6063

[2] Trends in the deep Southern Ocean (1958-2010): Implications for Antarctic Bottom Water properties and volume export [J].

Azaneu, Marina ;

Kerr, Rodrigo ;

Mata, Mauricio M. ;

Garcia, Carlos A. E. .

JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2013, 118 (09) :4213-4227

[3] On the circulation and water masses over the Antarctic continental slope and rise between 80 and 150°E [J].

Bindoff, NL ;

Rosenberg, MA ;

Warner, MJ .

DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 2000, 47 (12-13) :2299-2326

[4] Rebound of shelf water salinity in the Ross Sea [J].

Castagno, Pasquale ;

Capozzi, Vincenzo ;

DiTullio, Giacomo R. ;

Falco, Pierpaolo ;

Fusco, Giannetta ;

Rintoul, Stephen R. ;

Spezie, Giancarlo ;

Budillon, Giorgio .

NATURE COMMUNICATIONS, 2019, 10 (1)

[5] Brief communication: Impacts of a developing polynya off Commonwealth Bay, East Antarctica, triggered by grounding of iceberg B09B [J].

Fogwill, Christopher J. ;

van Sebille, Erik ;

Cougnon, Eva A. ;

Turney, Chris S. M. ;

Rintoul, Steve R. ;

Galton-Fenzi, Benjamin K. ;

Clark, Graeme F. ;

Marzinelli, E. M. ;

Rainsley, Eleanor B. ;

Carter, Lionel .

CRYOSPHERE, 2016, 10 (06) :2603-2609

[6] Strong export of Antarctic Bottom Water east of the Kerguelen plateau [J].

Fukamachi, Y. ;

Rintoul, S. R. ;

Church, J. A. ;

Aoki, S. ;

Sokolov, S. ;

Rosenberg, M. A. ;

Wakatsuchi, M. .

NATURE GEOSCIENCE, 2010, 3 (05) :327-331

[7] Western Ross Sea continental slope gravity currents [J].

Gordon, Arnold L. ;

Orsi, Alejandro H. ;

Muench, Robin ;

Huber, Bruce A. ;

Zambianchi, Enrico ;

Visbeck, Martin .

DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 2009, 56 (13-14) :796-817

[8] Frontal structure and Antarctic Bottom Water Flow through the Princess Elizabeth Trough, Antarctica [J].

Heywood, KJ ;

Sparrow, MD ;

Brown, J ;

Dickson, RR .

DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, 1999, 46 (07) :1181-1200

[9]

Jacobs SS, 2011, NAT GEOSCI, V4, P519, DOI [10.1038/NGEO1188, 10.1038/ngeo1188]

[10] Large Multidecadal Salinity Trends near the Pacific-Antarctic Continental Margin [J].

Jacobs, Stanley S. ;

Giulivi, Claudia F. .

JOURNAL OF CLIMATE, 2010, 23 (17) :4508-4524

← 1 2 3 4 →