Millennial- to Orbital-Scale Responses of Western Equatorial Atlantic Thermocline Depth to Changes in the Trade Wind System Since the Last Interglacial
Surface ocean circulation in the western equatorial Atlantic is mainly wind driven and plays a major role for the transport of warm waters to the North Atlantic. Past changes in the strength and direction of the trade winds are well documented, but the response of the western equatorial Atlantic cir...
Published in: | Paleoceanography and Paleoclimatology |
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Language: | English |
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American Geophysical Union
2018
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Online Access: | https://oskar-bordeaux.fr/handle/20.500.12278/30215 https://doi.org/10.1029/2018PA003437 |
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/30215 2023-05-15T17:34:06+02:00 Millennial- to Orbital-Scale Responses of Western Equatorial Atlantic Thermocline Depth to Changes in the Trade Wind System Since the Last Interglacial VENANCIO, I. MULITZA, S. GOVIN, A. SANTOS, T. LESSA, D. O. ALBUQUERQUE, A. L. S. CHIESSI, C. TIEDEMANN, R. VAHLENKAMP, M. BICKERT, T. SCHULZ, M 2018 https://oskar-bordeaux.fr/handle/20.500.12278/30215 https://doi.org/10.1029/2018PA003437 en eng American Geophysical Union 2572-4525 https://oskar-bordeaux.fr/handle/20.500.12278/30215 doi:10.1029/2018PA003437 Planète et Univers [physics]/Sciences de la Terre/Climatologie Planète et Univers [physics]/Sciences de la Terre/Océanographie Article de revue 2018 ftoskarbordeaux https://doi.org/10.1029/2018PA003437 2021-05-11T22:30:27Z Surface ocean circulation in the western equatorial Atlantic is mainly wind driven and plays a major role for the transport of warm waters to the North Atlantic. Past changes in the strength and direction of the trade winds are well documented, but the response of the western equatorial Atlantic circulation and water column structure to these changes is unclear. Here we used the difference between the stable isotopic oxygen composition of two species of planktonic foraminifera (Globigerinoides ruber white and Neogloboquadrina dutertrei) from two sediment cores collected off northeastern Brazil to investigate millennial-and orbital-scale changes in upper ocean stratification since the Last Interglacial. Our records indicate enhanced upper ocean stratification during several Heinrich stadials, partly due to a shoaling of the thermocline, which was linked to a decrease in the strength of southeast trades winds. In addition, we show that a decrease in wind zonality induced by increases in Northern Hemisphere low-latitude summer insolation causes a shoaling of the thermocline in the western equatorial Atlantic. These ocean-atmosphere changes contributed to a reduction in the cross-equatorial transport of warm waters, particularly during Heinrich stadials and Marine Isotope Stage 4. Other/Unknown Material North Atlantic Planktonic foraminifera OSKAR Bordeaux (Open Science Knowledge ARchive) Paleoceanography and Paleoclimatology 33 12 1490 1507 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Planète et Univers [physics]/Sciences de la Terre/Climatologie Planète et Univers [physics]/Sciences de la Terre/Océanographie |
spellingShingle |
Planète et Univers [physics]/Sciences de la Terre/Climatologie Planète et Univers [physics]/Sciences de la Terre/Océanographie VENANCIO, I. MULITZA, S. GOVIN, A. SANTOS, T. LESSA, D. O. ALBUQUERQUE, A. L. S. CHIESSI, C. TIEDEMANN, R. VAHLENKAMP, M. BICKERT, T. SCHULZ, M Millennial- to Orbital-Scale Responses of Western Equatorial Atlantic Thermocline Depth to Changes in the Trade Wind System Since the Last Interglacial |
topic_facet |
Planète et Univers [physics]/Sciences de la Terre/Climatologie Planète et Univers [physics]/Sciences de la Terre/Océanographie |
description |
Surface ocean circulation in the western equatorial Atlantic is mainly wind driven and plays a major role for the transport of warm waters to the North Atlantic. Past changes in the strength and direction of the trade winds are well documented, but the response of the western equatorial Atlantic circulation and water column structure to these changes is unclear. Here we used the difference between the stable isotopic oxygen composition of two species of planktonic foraminifera (Globigerinoides ruber white and Neogloboquadrina dutertrei) from two sediment cores collected off northeastern Brazil to investigate millennial-and orbital-scale changes in upper ocean stratification since the Last Interglacial. Our records indicate enhanced upper ocean stratification during several Heinrich stadials, partly due to a shoaling of the thermocline, which was linked to a decrease in the strength of southeast trades winds. In addition, we show that a decrease in wind zonality induced by increases in Northern Hemisphere low-latitude summer insolation causes a shoaling of the thermocline in the western equatorial Atlantic. These ocean-atmosphere changes contributed to a reduction in the cross-equatorial transport of warm waters, particularly during Heinrich stadials and Marine Isotope Stage 4. |
format |
Other/Unknown Material |
author |
VENANCIO, I. MULITZA, S. GOVIN, A. SANTOS, T. LESSA, D. O. ALBUQUERQUE, A. L. S. CHIESSI, C. TIEDEMANN, R. VAHLENKAMP, M. BICKERT, T. SCHULZ, M |
author_facet |
VENANCIO, I. MULITZA, S. GOVIN, A. SANTOS, T. LESSA, D. O. ALBUQUERQUE, A. L. S. CHIESSI, C. TIEDEMANN, R. VAHLENKAMP, M. BICKERT, T. SCHULZ, M |
author_sort |
VENANCIO, I. |
title |
Millennial- to Orbital-Scale Responses of Western Equatorial Atlantic Thermocline Depth to Changes in the Trade Wind System Since the Last Interglacial |
title_short |
Millennial- to Orbital-Scale Responses of Western Equatorial Atlantic Thermocline Depth to Changes in the Trade Wind System Since the Last Interglacial |
title_full |
Millennial- to Orbital-Scale Responses of Western Equatorial Atlantic Thermocline Depth to Changes in the Trade Wind System Since the Last Interglacial |
title_fullStr |
Millennial- to Orbital-Scale Responses of Western Equatorial Atlantic Thermocline Depth to Changes in the Trade Wind System Since the Last Interglacial |
title_full_unstemmed |
Millennial- to Orbital-Scale Responses of Western Equatorial Atlantic Thermocline Depth to Changes in the Trade Wind System Since the Last Interglacial |
title_sort |
millennial- to orbital-scale responses of western equatorial atlantic thermocline depth to changes in the trade wind system since the last interglacial |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/30215 https://doi.org/10.1029/2018PA003437 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_relation |
2572-4525 https://oskar-bordeaux.fr/handle/20.500.12278/30215 doi:10.1029/2018PA003437 |
op_doi |
https://doi.org/10.1029/2018PA003437 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
33 |
container_issue |
12 |
container_start_page |
1490 |
op_container_end_page |
1507 |
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1766132820234731520 |