Strong middepth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas
We present a benthic foraminiferal multiproxy record of eastern equatorial Atlantic (EEA) middepth water (1295m) covering the last deglacial. We show that EEA middepth water temperatures were elevated by 3.90.5 degrees C and 5.21.2 degrees C during Heinrich event 1 (H1) and Younger Dryas (YD), respe...
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fttriple:oai:gotriple.eu:10670/1.px9kwx 2023-05-15T17:31:21+02:00 Strong middepth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas Weldeab, Syee Friedrich, Tobias Timmermann, Axel Schneider, Ralph R. https://doi.org/10.1002/2016PA002957 https://archimer.ifremer.fr/doc/00421/53228/54788.pdf https://archimer.ifremer.fr/doc/00421/53228/ en eng Amer Geophysical Union doi:10.1002/2016PA002957 10670/1.px9kwx https://archimer.ifremer.fr/doc/00421/53228/54788.pdf https://archimer.ifremer.fr/doc/00421/53228/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2016-08 , Vol. 31 , N. 8 , P. 1070-1082 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1002/2016PA002957 2023-01-22T18:12:32Z We present a benthic foraminiferal multiproxy record of eastern equatorial Atlantic (EEA) middepth water (1295m) covering the last deglacial. We show that EEA middepth water temperatures were elevated by 3.90.5 degrees C and 5.21.2 degrees C during Heinrich event 1 (H1) and Younger Dryas (YD), respectively. The radiocarbon content of the EEA middepth during H1 and YD is relatively low and comparable to the values of the pre-H1 episode and BOlling-AllerOd, respectively. A transient Earth system model simulation, which mimics the observed deglacial Atlantic Meridional Overturning Circulation (AMOC) history, qualitatively reproduces the major features of the EEA proxy records. The simulation results suggest that fresh water-induced weakening of the AMOC leads to a vertical shift of the horizon of Southern Ocean-sourced water and a stronger influence of EEA sea surface temperatures via mixing. Our findings reaffirm the lack of a distinctive signature of radiocarbon depletion and therefore do not support the notion of interhemispheric exchanges of strongly radiocarbon-depleted middepth water across the tropical Atlantic during H1 and YD. Our temperature reconstruction presents a critical zonal and water depth extension of existing tropical Atlantic data and documents a large-scale and basin-wide warming across the thermocline and middepth of the tropical Atlantic during H1 and YD. Significant difference in the timing and pace of H1 middepth warming between tropical Atlantic and North Atlantic likely points to a limited role of the tropical Atlantic middepth warming in the rapid heat buildup in the North Atlantic middepth. Text North Atlantic Southern Ocean Unknown Southern Ocean Paleoceanography 31 8 1070 1082 |
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envir geo Weldeab, Syee Friedrich, Tobias Timmermann, Axel Schneider, Ralph R. Strong middepth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas |
topic_facet |
envir geo |
description |
We present a benthic foraminiferal multiproxy record of eastern equatorial Atlantic (EEA) middepth water (1295m) covering the last deglacial. We show that EEA middepth water temperatures were elevated by 3.90.5 degrees C and 5.21.2 degrees C during Heinrich event 1 (H1) and Younger Dryas (YD), respectively. The radiocarbon content of the EEA middepth during H1 and YD is relatively low and comparable to the values of the pre-H1 episode and BOlling-AllerOd, respectively. A transient Earth system model simulation, which mimics the observed deglacial Atlantic Meridional Overturning Circulation (AMOC) history, qualitatively reproduces the major features of the EEA proxy records. The simulation results suggest that fresh water-induced weakening of the AMOC leads to a vertical shift of the horizon of Southern Ocean-sourced water and a stronger influence of EEA sea surface temperatures via mixing. Our findings reaffirm the lack of a distinctive signature of radiocarbon depletion and therefore do not support the notion of interhemispheric exchanges of strongly radiocarbon-depleted middepth water across the tropical Atlantic during H1 and YD. Our temperature reconstruction presents a critical zonal and water depth extension of existing tropical Atlantic data and documents a large-scale and basin-wide warming across the thermocline and middepth of the tropical Atlantic during H1 and YD. Significant difference in the timing and pace of H1 middepth warming between tropical Atlantic and North Atlantic likely points to a limited role of the tropical Atlantic middepth warming in the rapid heat buildup in the North Atlantic middepth. |
format |
Text |
author |
Weldeab, Syee Friedrich, Tobias Timmermann, Axel Schneider, Ralph R. |
author_facet |
Weldeab, Syee Friedrich, Tobias Timmermann, Axel Schneider, Ralph R. |
author_sort |
Weldeab, Syee |
title |
Strong middepth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas |
title_short |
Strong middepth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas |
title_full |
Strong middepth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas |
title_fullStr |
Strong middepth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas |
title_full_unstemmed |
Strong middepth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas |
title_sort |
strong middepth warming and weak radiocarbon imprints in the equatorial atlantic during heinrich 1 and younger dryas |
publisher |
Amer Geophysical Union |
url |
https://doi.org/10.1002/2016PA002957 https://archimer.ifremer.fr/doc/00421/53228/54788.pdf https://archimer.ifremer.fr/doc/00421/53228/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2016-08 , Vol. 31 , N. 8 , P. 1070-1082 |
op_relation |
doi:10.1002/2016PA002957 10670/1.px9kwx https://archimer.ifremer.fr/doc/00421/53228/54788.pdf https://archimer.ifremer.fr/doc/00421/53228/ |
op_rights |
other |
op_doi |
https://doi.org/10.1002/2016PA002957 |
container_title |
Paleoceanography |
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31 |
container_issue |
8 |
container_start_page |
1070 |
op_container_end_page |
1082 |
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1766128870581338112 |