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
Hauptverfasser: 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.
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container_end_page 746
container_issue 10
container_start_page 742
container_title Nature climate change
container_volume 9
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
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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.</creator><creatorcontrib>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.</creatorcontrib><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 . 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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. 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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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