Precession modulation of the South Pacific westerly wind belt over the past million years, supplement to: Lamy, Frank; Chiang, John C H; Martínez Méndez, Gema; Thierens, Mieke; Arz, Helge Wolfgang; Bosmans, Joyce H C; Hebbeln, Dierk; Lambert, Fabrice; Lembke-Jene, Lester; Stuut, Jan-Berend W (2019): Precession modulation of the South Pacific westerly wind belt over the past million years. Proceedings of the National Academy of Sciences of the United States of America
The southern westerly wind belt (SWW) interacts with the Antarctic Circumpolar Current and strongly impacts the Southern Ocean carbon budget, and Antarctic ice-sheet dynamics across glacial- interglacial cycles. We investigated precipitation-driven sediment input changes to the Southeast Pacific off...
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Online Access: | https://dx.doi.org/10.1594/pangaea.907631 https://doi.pangaea.de/10.1594/PANGAEA.907631 |
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ftdatacite:10.1594/pangaea.907631 2023-05-15T13:52:56+02:00 Precession modulation of the South Pacific westerly wind belt over the past million years, supplement to: Lamy, Frank; Chiang, John C H; Martínez Méndez, Gema; Thierens, Mieke; Arz, Helge Wolfgang; Bosmans, Joyce H C; Hebbeln, Dierk; Lambert, Fabrice; Lembke-Jene, Lester; Stuut, Jan-Berend W (2019): Precession modulation of the South Pacific westerly wind belt over the past million years. Proceedings of the National Academy of Sciences of the United States of America Lamy, Frank Chiang, John C H Martínez Méndez, Gema Thierens, Mieke Arz, Helge Wolfgang Bosmans, Joyce H C Hebbeln, Dierk Lambert, Fabrice Lembke-Jene, Lester Stuut, Jan-Berend W 2019 application/zip https://dx.doi.org/10.1594/pangaea.907631 https://doi.pangaea.de/10.1594/PANGAEA.907631 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1073/pnas.1905847116 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo Collection article Supplementary Collection of Datasets 2019 ftdatacite https://doi.org/10.1594/pangaea.907631 https://doi.org/10.1073/pnas.1905847116 2021-11-05T12:55:41Z The southern westerly wind belt (SWW) interacts with the Antarctic Circumpolar Current and strongly impacts the Southern Ocean carbon budget, and Antarctic ice-sheet dynamics across glacial- interglacial cycles. We investigated precipitation-driven sediment input changes to the Southeast Pacific off the southern margin of the Atacama Desert in Chile over the past one million years, revealing strong precession (19/23-ka) cycles. Our simulations with 2 ocean-atmosphere general circulation models suggest that observed cyclic rainfall changes are linked to meridional shifts in water vapor transport from the tropical Pacific toward the southern Atacama Desert. These changes reflect a precessional modulation of the split in the austral winter South Pacific jet stream. For precession maxima, we infer significantly enhanced rainfall in the southern Atacama Desert due to a stronger South Pacific split jet with enhanced subtropical/subpolar jets, and a weakermidlatitude jet. Conversely, we derive dry conditions in northern Chile related to reduced subtropical/subpolar jets and an enhanced midlatitude jet for precession minima. The presence of precessional cycles in the Pacific SWW, and lack thereof in other basins, indicate that orbital-scale changes of the SWW were not zonally homogeneous across the Southern Hemisphere, in contrast to the hemispherewide shifts of the SWW suggested for glacial terminations. The strengthening of the jet is unique to the South Pacific realm and might have affected winter-controlled changes in the mixed layer depth, the formation of intermediate water, and the built-up of sea-ice around Antarctica, with implications for the global overturning circulation and the oceanic storage of atmospheric CO2. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Austral Pacific Martínez ENVELOPE(-62.183,-62.183,-64.650,-64.650) Lester ENVELOPE(-62.583,-62.583,-64.900,-64.900) Chiang ENVELOPE(162.650,162.650,-77.967,-77.967) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo |
spellingShingle |
Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo Lamy, Frank Chiang, John C H Martínez Méndez, Gema Thierens, Mieke Arz, Helge Wolfgang Bosmans, Joyce H C Hebbeln, Dierk Lambert, Fabrice Lembke-Jene, Lester Stuut, Jan-Berend W Precession modulation of the South Pacific westerly wind belt over the past million years, supplement to: Lamy, Frank; Chiang, John C H; Martínez Méndez, Gema; Thierens, Mieke; Arz, Helge Wolfgang; Bosmans, Joyce H C; Hebbeln, Dierk; Lambert, Fabrice; Lembke-Jene, Lester; Stuut, Jan-Berend W (2019): Precession modulation of the South Pacific westerly wind belt over the past million years. Proceedings of the National Academy of Sciences of the United States of America |
topic_facet |
Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo |
description |
The southern westerly wind belt (SWW) interacts with the Antarctic Circumpolar Current and strongly impacts the Southern Ocean carbon budget, and Antarctic ice-sheet dynamics across glacial- interglacial cycles. We investigated precipitation-driven sediment input changes to the Southeast Pacific off the southern margin of the Atacama Desert in Chile over the past one million years, revealing strong precession (19/23-ka) cycles. Our simulations with 2 ocean-atmosphere general circulation models suggest that observed cyclic rainfall changes are linked to meridional shifts in water vapor transport from the tropical Pacific toward the southern Atacama Desert. These changes reflect a precessional modulation of the split in the austral winter South Pacific jet stream. For precession maxima, we infer significantly enhanced rainfall in the southern Atacama Desert due to a stronger South Pacific split jet with enhanced subtropical/subpolar jets, and a weakermidlatitude jet. Conversely, we derive dry conditions in northern Chile related to reduced subtropical/subpolar jets and an enhanced midlatitude jet for precession minima. The presence of precessional cycles in the Pacific SWW, and lack thereof in other basins, indicate that orbital-scale changes of the SWW were not zonally homogeneous across the Southern Hemisphere, in contrast to the hemispherewide shifts of the SWW suggested for glacial terminations. The strengthening of the jet is unique to the South Pacific realm and might have affected winter-controlled changes in the mixed layer depth, the formation of intermediate water, and the built-up of sea-ice around Antarctica, with implications for the global overturning circulation and the oceanic storage of atmospheric CO2. |
format |
Article in Journal/Newspaper |
author |
Lamy, Frank Chiang, John C H Martínez Méndez, Gema Thierens, Mieke Arz, Helge Wolfgang Bosmans, Joyce H C Hebbeln, Dierk Lambert, Fabrice Lembke-Jene, Lester Stuut, Jan-Berend W |
author_facet |
Lamy, Frank Chiang, John C H Martínez Méndez, Gema Thierens, Mieke Arz, Helge Wolfgang Bosmans, Joyce H C Hebbeln, Dierk Lambert, Fabrice Lembke-Jene, Lester Stuut, Jan-Berend W |
author_sort |
Lamy, Frank |
title |
Precession modulation of the South Pacific westerly wind belt over the past million years, supplement to: Lamy, Frank; Chiang, John C H; Martínez Méndez, Gema; Thierens, Mieke; Arz, Helge Wolfgang; Bosmans, Joyce H C; Hebbeln, Dierk; Lambert, Fabrice; Lembke-Jene, Lester; Stuut, Jan-Berend W (2019): Precession modulation of the South Pacific westerly wind belt over the past million years. Proceedings of the National Academy of Sciences of the United States of America |
title_short |
Precession modulation of the South Pacific westerly wind belt over the past million years, supplement to: Lamy, Frank; Chiang, John C H; Martínez Méndez, Gema; Thierens, Mieke; Arz, Helge Wolfgang; Bosmans, Joyce H C; Hebbeln, Dierk; Lambert, Fabrice; Lembke-Jene, Lester; Stuut, Jan-Berend W (2019): Precession modulation of the South Pacific westerly wind belt over the past million years. Proceedings of the National Academy of Sciences of the United States of America |
title_full |
Precession modulation of the South Pacific westerly wind belt over the past million years, supplement to: Lamy, Frank; Chiang, John C H; Martínez Méndez, Gema; Thierens, Mieke; Arz, Helge Wolfgang; Bosmans, Joyce H C; Hebbeln, Dierk; Lambert, Fabrice; Lembke-Jene, Lester; Stuut, Jan-Berend W (2019): Precession modulation of the South Pacific westerly wind belt over the past million years. Proceedings of the National Academy of Sciences of the United States of America |
title_fullStr |
Precession modulation of the South Pacific westerly wind belt over the past million years, supplement to: Lamy, Frank; Chiang, John C H; Martínez Méndez, Gema; Thierens, Mieke; Arz, Helge Wolfgang; Bosmans, Joyce H C; Hebbeln, Dierk; Lambert, Fabrice; Lembke-Jene, Lester; Stuut, Jan-Berend W (2019): Precession modulation of the South Pacific westerly wind belt over the past million years. Proceedings of the National Academy of Sciences of the United States of America |
title_full_unstemmed |
Precession modulation of the South Pacific westerly wind belt over the past million years, supplement to: Lamy, Frank; Chiang, John C H; Martínez Méndez, Gema; Thierens, Mieke; Arz, Helge Wolfgang; Bosmans, Joyce H C; Hebbeln, Dierk; Lambert, Fabrice; Lembke-Jene, Lester; Stuut, Jan-Berend W (2019): Precession modulation of the South Pacific westerly wind belt over the past million years. Proceedings of the National Academy of Sciences of the United States of America |
title_sort |
precession modulation of the south pacific westerly wind belt over the past million years, supplement to: lamy, frank; chiang, john c h; martínez méndez, gema; thierens, mieke; arz, helge wolfgang; bosmans, joyce h c; hebbeln, dierk; lambert, fabrice; lembke-jene, lester; stuut, jan-berend w (2019): precession modulation of the south pacific westerly wind belt over the past million years. proceedings of the national academy of sciences of the united states of america |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2019 |
url |
https://dx.doi.org/10.1594/pangaea.907631 https://doi.pangaea.de/10.1594/PANGAEA.907631 |
long_lat |
ENVELOPE(-62.183,-62.183,-64.650,-64.650) ENVELOPE(-62.583,-62.583,-64.900,-64.900) ENVELOPE(162.650,162.650,-77.967,-77.967) |
geographic |
Antarctic Southern Ocean The Antarctic Austral Pacific Martínez Lester Chiang |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral Pacific Martínez Lester Chiang |
genre |
Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean |
op_relation |
https://dx.doi.org/10.1073/pnas.1905847116 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.907631 https://doi.org/10.1073/pnas.1905847116 |
_version_ |
1766257780731150336 |