Stabilization of dense Antarctic water supply to the Atlantic Ocean overturning circulation
The lower limb of the Atlantic overturning circulation is resupplied by the sinking of dense Antarctic Bottom Water (AABW) that forms via intense air–sea–ice interactions next to Antarctica, especially in the Weddell Sea 1 . In the last three decades, AABW has warmed, freshened and declined in volum...
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Veröffentlicht in: | Nature climate change 2019-10, Vol.9 (10), p.742-746 |
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creator | Abrahamsen, E. Povl Meijers, Andrew J. S. Polzin, Kurt L. Naveira Garabato, Alberto C. King, Brian A. Firing, Yvonne L. Sallée, Jean-Baptiste Sheen, Katy L. Gordon, Arnold L. Huber, Bruce A. Meredith, Michael P. |
description | The lower limb of the Atlantic overturning circulation is resupplied by the sinking of dense Antarctic Bottom Water (AABW) that forms via intense air–sea–ice interactions next to Antarctica, especially in the Weddell Sea
1
. In the last three decades, AABW has warmed, freshened and declined in volume across the Atlantic Ocean and elsewhere
2
–
7
, suggesting an ongoing major reorganization of oceanic overturning
8
,
9
. However, the future contributions of AABW to the Atlantic overturning circulation are unclear. Here, using observations of AABW in the Scotia Sea, the most direct pathway from the Weddell Sea to the Atlantic Ocean, we show a recent cessation in the decline of the AABW supply to the Atlantic overturning circulation. The strongest decline was observed in the volume of the densest layers in the AABW throughflow from the early 1990s to 2014; since then, it has stabilized and partially recovered. We link these changes to variability in the densest classes of abyssal waters upstream. Our findings indicate that the previously observed decline in the supply of dense water to the Atlantic Ocean abyss may be stabilizing or reversing and thus call for a reassessment of Antarctic influences on overturning circulation, sea level, planetary-scale heat distribution and global climate
2
,
3
,
8
.
The supply of dense Antarctic Bottom Water to the Atlantic overturning circulation has declined in recent years. Observations show that since 2014 this has stabilized and slightly recovered due to variability in upstream dense waters, with implications for the global climate. |
doi_str_mv | 10.1038/s41558-019-0561-2 |
format | Article |
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1
. In the last three decades, AABW has warmed, freshened and declined in volume across the Atlantic Ocean and elsewhere
2
–
7
, suggesting an ongoing major reorganization of oceanic overturning
8
,
9
. However, the future contributions of AABW to the Atlantic overturning circulation are unclear. Here, using observations of AABW in the Scotia Sea, the most direct pathway from the Weddell Sea to the Atlantic Ocean, we show a recent cessation in the decline of the AABW supply to the Atlantic overturning circulation. The strongest decline was observed in the volume of the densest layers in the AABW throughflow from the early 1990s to 2014; since then, it has stabilized and partially recovered. We link these changes to variability in the densest classes of abyssal waters upstream. Our findings indicate that the previously observed decline in the supply of dense water to the Atlantic Ocean abyss may be stabilizing or reversing and thus call for a reassessment of Antarctic influences on overturning circulation, sea level, planetary-scale heat distribution and global climate
2
,
3
,
8
.
The supply of dense Antarctic Bottom Water to the Atlantic overturning circulation has declined in recent years. Observations show that since 2014 this has stabilized and slightly recovered due to variability in upstream dense waters, with implications for the global climate.</description><identifier>ISSN: 1758-678X</identifier><identifier>EISSN: 1758-6798</identifier><identifier>DOI: 10.1038/s41558-019-0561-2</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>704/106/694 ; 704/106/829/2737 ; 704/829/2737 ; Abyssal environment ; Abyssal zone ; Air-sea interaction ; Antarctic bottom water ; Antarctic circulation ; Bottom water ; Circulation ; Climate Change ; Climate Change/Climate Change Impacts ; Dense water ; Earth and Environmental Science ; Environment ; Environmental Law/Policy/Ecojustice ; Geophysics ; Global climate ; Heat distribution ; Letter ; Oceans ; Physics ; Sea level ; Stabilizing ; Trends ; Water circulation ; Water shortages ; Water supply</subject><ispartof>Nature climate change, 2019-10, Vol.9 (10), p.742-746</ispartof><rights>The Author(s), under exclusive licence to Springer Nature Limited 2019</rights><rights>Copyright Nature Publishing Group Oct 2019</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c459t-cefd0752b4fc3e90db8b797cf3b2c283dd0638425e5ab1a62ae74666659928d73</citedby><cites>FETCH-LOGICAL-c459t-cefd0752b4fc3e90db8b797cf3b2c283dd0638425e5ab1a62ae74666659928d73</cites><orcidid>0000-0001-6071-605X ; 0000-0001-5924-5350 ; 0000-0001-6413-1614 ; 0000-0002-3640-3974 ; 0000-0001-6480-6095 ; 0000-0003-3876-7736 ; 0000-0002-6109-5176</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1038/s41558-019-0561-2$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1038/s41558-019-0561-2$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>230,314,776,780,881,27901,27902,41464,42533,51294</link.rule.ids><backlink>$$Uhttps://hal.science/hal-02517906$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Abrahamsen, E. Povl</creatorcontrib><creatorcontrib>Meijers, Andrew J. S.</creatorcontrib><creatorcontrib>Polzin, Kurt L.</creatorcontrib><creatorcontrib>Naveira Garabato, Alberto C.</creatorcontrib><creatorcontrib>King, Brian A.</creatorcontrib><creatorcontrib>Firing, Yvonne L.</creatorcontrib><creatorcontrib>Sallée, Jean-Baptiste</creatorcontrib><creatorcontrib>Sheen, Katy L.</creatorcontrib><creatorcontrib>Gordon, Arnold L.</creatorcontrib><creatorcontrib>Huber, Bruce A.</creatorcontrib><creatorcontrib>Meredith, Michael P.</creatorcontrib><title>Stabilization of dense Antarctic water supply to the Atlantic Ocean overturning circulation</title><title>Nature climate change</title><addtitle>Nat. Clim. Chang</addtitle><description>The lower limb of the Atlantic overturning circulation is resupplied by the sinking of dense Antarctic Bottom Water (AABW) that forms via intense air–sea–ice interactions next to Antarctica, especially in the Weddell Sea
1
. In the last three decades, AABW has warmed, freshened and declined in volume across the Atlantic Ocean and elsewhere
2
–
7
, suggesting an ongoing major reorganization of oceanic overturning
8
,
9
. However, the future contributions of AABW to the Atlantic overturning circulation are unclear. Here, using observations of AABW in the Scotia Sea, the most direct pathway from the Weddell Sea to the Atlantic Ocean, we show a recent cessation in the decline of the AABW supply to the Atlantic overturning circulation. The strongest decline was observed in the volume of the densest layers in the AABW throughflow from the early 1990s to 2014; since then, it has stabilized and partially recovered. We link these changes to variability in the densest classes of abyssal waters upstream. Our findings indicate that the previously observed decline in the supply of dense water to the Atlantic Ocean abyss may be stabilizing or reversing and thus call for a reassessment of Antarctic influences on overturning circulation, sea level, planetary-scale heat distribution and global climate
2
,
3
,
8
.
The supply of dense Antarctic Bottom Water to the Atlantic overturning circulation has declined in recent years. Observations show that since 2014 this has stabilized and slightly recovered due to variability in upstream dense waters, with implications for the global climate.</description><subject>704/106/694</subject><subject>704/106/829/2737</subject><subject>704/829/2737</subject><subject>Abyssal environment</subject><subject>Abyssal zone</subject><subject>Air-sea interaction</subject><subject>Antarctic bottom water</subject><subject>Antarctic circulation</subject><subject>Bottom water</subject><subject>Circulation</subject><subject>Climate Change</subject><subject>Climate Change/Climate Change Impacts</subject><subject>Dense water</subject><subject>Earth and Environmental Science</subject><subject>Environment</subject><subject>Environmental Law/Policy/Ecojustice</subject><subject>Geophysics</subject><subject>Global climate</subject><subject>Heat distribution</subject><subject>Letter</subject><subject>Oceans</subject><subject>Physics</subject><subject>Sea level</subject><subject>Stabilizing</subject><subject>Trends</subject><subject>Water circulation</subject><subject>Water shortages</subject><subject>Water supply</subject><issn>1758-678X</issn><issn>1758-6798</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNp1kMFLwzAUxoMoOOb-AG8BTx6qSdokzXEMdcJgBxUEDyFN0y2jtjVJJ_OvN7UyT77Le7z3-z4eHwCXGN1glOa3PsOU5gnCIkGU4YScgAnmccO4yE-Pc_56Dmbe71AsjlnKxAS8PQVV2Np-qWDbBrYVLE3jDZw3QTkdrIafKhgHfd919QGGFoZtvIZaNcNxrY2Kqr1xoXeNbTZQW6f7-sftApxVqvZm9tun4OX-7nmxTFbrh8fFfJXojIqQaFOViFNSZJVOjUBlkRdccF2lBdEkT8sSsTTPCDVUFVgxogzPWCwqBMlLnk7B9ei7VbXsnH1X7iBbZeVyvpLDDhGKuUBsjyN7NbKdaz9644PctfHz-J4kRHCMMyFEpPBIadd670x1tMVIDpHLMXIZI5dD5JJEDRk1PrLNxrg_5_9F38Qog78</recordid><startdate>20191001</startdate><enddate>20191001</enddate><creator>Abrahamsen, E. 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S.</creator><creator>Polzin, Kurt L.</creator><creator>Naveira Garabato, Alberto C.</creator><creator>King, Brian A.</creator><creator>Firing, Yvonne L.</creator><creator>Sallée, Jean-Baptiste</creator><creator>Sheen, Katy L.</creator><creator>Gordon, Arnold L.</creator><creator>Huber, Bruce A.</creator><creator>Meredith, Michael P.</creator><general>Nature Publishing Group UK</general><general>Nature Publishing Group</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7ST</scope><scope>7TG</scope><scope>7TN</scope><scope>7XB</scope><scope>88I</scope><scope>8AF</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>H96</scope><scope>H97</scope><scope>HCIFZ</scope><scope>KL.</scope><scope>L.G</scope><scope>M2P</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope><scope>SOI</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0001-6071-605X</orcidid><orcidid>https://orcid.org/0000-0001-5924-5350</orcidid><orcidid>https://orcid.org/0000-0001-6413-1614</orcidid><orcidid>https://orcid.org/0000-0002-3640-3974</orcidid><orcidid>https://orcid.org/0000-0001-6480-6095</orcidid><orcidid>https://orcid.org/0000-0003-3876-7736</orcidid><orcidid>https://orcid.org/0000-0002-6109-5176</orcidid></search><sort><creationdate>20191001</creationdate><title>Stabilization of dense Antarctic water supply to the Atlantic Ocean overturning circulation</title><author>Abrahamsen, E. 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Povl</au><au>Meijers, Andrew J. S.</au><au>Polzin, Kurt L.</au><au>Naveira Garabato, Alberto C.</au><au>King, Brian A.</au><au>Firing, Yvonne L.</au><au>Sallée, Jean-Baptiste</au><au>Sheen, Katy L.</au><au>Gordon, Arnold L.</au><au>Huber, Bruce A.</au><au>Meredith, Michael P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Stabilization of dense Antarctic water supply to the Atlantic Ocean overturning circulation</atitle><jtitle>Nature climate change</jtitle><stitle>Nat. Clim. Chang</stitle><date>2019-10-01</date><risdate>2019</risdate><volume>9</volume><issue>10</issue><spage>742</spage><epage>746</epage><pages>742-746</pages><issn>1758-678X</issn><eissn>1758-6798</eissn><abstract>The lower limb of the Atlantic overturning circulation is resupplied by the sinking of dense Antarctic Bottom Water (AABW) that forms via intense air–sea–ice interactions next to Antarctica, especially in the Weddell Sea
1
. In the last three decades, AABW has warmed, freshened and declined in volume across the Atlantic Ocean and elsewhere
2
–
7
, suggesting an ongoing major reorganization of oceanic overturning
8
,
9
. However, the future contributions of AABW to the Atlantic overturning circulation are unclear. Here, using observations of AABW in the Scotia Sea, the most direct pathway from the Weddell Sea to the Atlantic Ocean, we show a recent cessation in the decline of the AABW supply to the Atlantic overturning circulation. The strongest decline was observed in the volume of the densest layers in the AABW throughflow from the early 1990s to 2014; since then, it has stabilized and partially recovered. We link these changes to variability in the densest classes of abyssal waters upstream. Our findings indicate that the previously observed decline in the supply of dense water to the Atlantic Ocean abyss may be stabilizing or reversing and thus call for a reassessment of Antarctic influences on overturning circulation, sea level, planetary-scale heat distribution and global climate
2
,
3
,
8
.
The supply of dense Antarctic Bottom Water to the Atlantic overturning circulation has declined in recent years. Observations show that since 2014 this has stabilized and slightly recovered due to variability in upstream dense waters, with implications for the global climate.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><doi>10.1038/s41558-019-0561-2</doi><tpages>5</tpages><orcidid>https://orcid.org/0000-0001-6071-605X</orcidid><orcidid>https://orcid.org/0000-0001-5924-5350</orcidid><orcidid>https://orcid.org/0000-0001-6413-1614</orcidid><orcidid>https://orcid.org/0000-0002-3640-3974</orcidid><orcidid>https://orcid.org/0000-0001-6480-6095</orcidid><orcidid>https://orcid.org/0000-0003-3876-7736</orcidid><orcidid>https://orcid.org/0000-0002-6109-5176</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | 704/106/694 704/106/829/2737 704/829/2737 Abyssal environment Abyssal zone Air-sea interaction Antarctic bottom water Antarctic circulation Bottom water Circulation Climate Change Climate Change/Climate Change Impacts Dense water Earth and Environmental Science Environment Environmental Law/Policy/Ecojustice Geophysics Global climate Heat distribution Letter Oceans Physics Sea level Stabilizing Trends Water circulation Water shortages Water supply |
title | Stabilization of dense Antarctic water supply to the Atlantic Ocean overturning circulation |
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