Tropical North Atlantic Subsurface Warming Events as a Fingerprint for AMOC Variability During Marine Isotope Stage 3
The role of Atlantic Meridional Overturning Circulation (AMOC) as the driver of Dansgaard-Oeschger (DO) variability that characterized Marine Isotope Stage 3 (MIS 3) has long been hypothesized. Although there is ample proxy evidence suggesting that DO events were robust features of glacial climate,...
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ftolddominionuni:oai:digitalcommons.odu.edu:oeas_fac_pubs-1228 2023-06-11T04:14:35+02:00 Tropical North Atlantic Subsurface Warming Events as a Fingerprint for AMOC Variability During Marine Isotope Stage 3 Parker, Andrew O. Schmidt, Matthew W Chang, Ping 2015-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_fac_pubs/211 https://doi.org/10.1002/2015pa002832 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1228/viewcontent/Parker_2015_Tropical_North_Atlantic_subsurface.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_fac_pubs/211 doi:10.1002/2015pa002832 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1228/viewcontent/Parker_2015_Tropical_North_Atlantic_subsurface.pdf OES Faculty Publications Atalantic Meridonal Overturning Circulation (AMOC) Intertropical convergence zone Sea surface temperature Clinate change Ocean circulation Subsurface warming Geology Oceanography Paleontology article 2015 ftolddominionuni https://doi.org/10.1002/2015pa002832 2023-05-08T17:59:46Z The role of Atlantic Meridional Overturning Circulation (AMOC) as the driver of Dansgaard-Oeschger (DO) variability that characterized Marine Isotope Stage 3 (MIS 3) has long been hypothesized. Although there is ample proxy evidence suggesting that DO events were robust features of glacial climate, there is little data supporting a link with AMOC. Recently, modeling studies and subsurface temperature reconstructions have suggested that subsurface warming across the tropical North Atlantic can be used to fingerprint a weakened AMOC during the deglacial because a reduction in the strength of the western boundary current allows warm salinity maximum water of the subtropical gyre to enter the deep tropics. To determine if AMOC variability played a role during the DO cycles of MIS 3, we present new, high-resolution Mg/Ca and δ18O records spanning 24-52 kyr from the near-surface dwelling planktonic foraminifera Globigerinoides ruber and the lower thermocline dwelling planktonic foraminifera Globorotalia truncatulinoides in Southern Caribbean core VM12-107 (11.33°N, 66.63°W, 1079m depth). Our subsurfaceMg/Ca record reveals abrupt increases in Mg/Ca ratios (the largest equal to a 4°C warming) during the interstadial-stadial transition of most DO events during this period. This change is consistent with reconstructions of subsurface warming events associated with cold events across the deglacial using the same core. Additionally, our data support the conclusion reached by a recently published study from the Florida Straits that AMOC did not undergo significant reductions during Heinrich events 2 and 3. This record presents some of the first high-resolution marine sediment derived evidence for variable AMOC during MIS 3. Article in Journal/Newspaper North Atlantic Planktonic foraminifera Old Dominion University: ODU Digital Commons Paleoceanography 30 11 1425 1436 |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Atalantic Meridonal Overturning Circulation (AMOC) Intertropical convergence zone Sea surface temperature Clinate change Ocean circulation Subsurface warming Geology Oceanography Paleontology |
spellingShingle |
Atalantic Meridonal Overturning Circulation (AMOC) Intertropical convergence zone Sea surface temperature Clinate change Ocean circulation Subsurface warming Geology Oceanography Paleontology Parker, Andrew O. Schmidt, Matthew W Chang, Ping Tropical North Atlantic Subsurface Warming Events as a Fingerprint for AMOC Variability During Marine Isotope Stage 3 |
topic_facet |
Atalantic Meridonal Overturning Circulation (AMOC) Intertropical convergence zone Sea surface temperature Clinate change Ocean circulation Subsurface warming Geology Oceanography Paleontology |
description |
The role of Atlantic Meridional Overturning Circulation (AMOC) as the driver of Dansgaard-Oeschger (DO) variability that characterized Marine Isotope Stage 3 (MIS 3) has long been hypothesized. Although there is ample proxy evidence suggesting that DO events were robust features of glacial climate, there is little data supporting a link with AMOC. Recently, modeling studies and subsurface temperature reconstructions have suggested that subsurface warming across the tropical North Atlantic can be used to fingerprint a weakened AMOC during the deglacial because a reduction in the strength of the western boundary current allows warm salinity maximum water of the subtropical gyre to enter the deep tropics. To determine if AMOC variability played a role during the DO cycles of MIS 3, we present new, high-resolution Mg/Ca and δ18O records spanning 24-52 kyr from the near-surface dwelling planktonic foraminifera Globigerinoides ruber and the lower thermocline dwelling planktonic foraminifera Globorotalia truncatulinoides in Southern Caribbean core VM12-107 (11.33°N, 66.63°W, 1079m depth). Our subsurfaceMg/Ca record reveals abrupt increases in Mg/Ca ratios (the largest equal to a 4°C warming) during the interstadial-stadial transition of most DO events during this period. This change is consistent with reconstructions of subsurface warming events associated with cold events across the deglacial using the same core. Additionally, our data support the conclusion reached by a recently published study from the Florida Straits that AMOC did not undergo significant reductions during Heinrich events 2 and 3. This record presents some of the first high-resolution marine sediment derived evidence for variable AMOC during MIS 3. |
format |
Article in Journal/Newspaper |
author |
Parker, Andrew O. Schmidt, Matthew W Chang, Ping |
author_facet |
Parker, Andrew O. Schmidt, Matthew W Chang, Ping |
author_sort |
Parker, Andrew O. |
title |
Tropical North Atlantic Subsurface Warming Events as a Fingerprint for AMOC Variability During Marine Isotope Stage 3 |
title_short |
Tropical North Atlantic Subsurface Warming Events as a Fingerprint for AMOC Variability During Marine Isotope Stage 3 |
title_full |
Tropical North Atlantic Subsurface Warming Events as a Fingerprint for AMOC Variability During Marine Isotope Stage 3 |
title_fullStr |
Tropical North Atlantic Subsurface Warming Events as a Fingerprint for AMOC Variability During Marine Isotope Stage 3 |
title_full_unstemmed |
Tropical North Atlantic Subsurface Warming Events as a Fingerprint for AMOC Variability During Marine Isotope Stage 3 |
title_sort |
tropical north atlantic subsurface warming events as a fingerprint for amoc variability during marine isotope stage 3 |
publisher |
ODU Digital Commons |
publishDate |
2015 |
url |
https://digitalcommons.odu.edu/oeas_fac_pubs/211 https://doi.org/10.1002/2015pa002832 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1228/viewcontent/Parker_2015_Tropical_North_Atlantic_subsurface.pdf |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
OES Faculty Publications |
op_relation |
https://digitalcommons.odu.edu/oeas_fac_pubs/211 doi:10.1002/2015pa002832 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1228/viewcontent/Parker_2015_Tropical_North_Atlantic_subsurface.pdf |
op_doi |
https://doi.org/10.1002/2015pa002832 |
container_title |
Paleoceanography |
container_volume |
30 |
container_issue |
11 |
container_start_page |
1425 |
op_container_end_page |
1436 |
_version_ |
1768392690545721344 |