Florida Straits Deglacial Temperature and Salinity Change: Implications for Tropical Hydrologic Cycle Variability During the Younger Dryas
The prevailing paradigm of abrupt climate change holds that rapid shifts associated with the most extreme climate swings of the last glacial cycle were forced by changes in the strength and northward extension of Atlantic Meridional Overturning Circulation (AMOC), resulting in an abrupt reorganizati...
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ftolddominionuni:oai:digitalcommons.odu.edu:oeas_fac_pubs-1232 2023-06-11T04:16:09+02:00 Florida Straits Deglacial Temperature and Salinity Change: Implications for Tropical Hydrologic Cycle Variability During the Younger Dryas Schmidt, Matthew W. Lynch-Stieglitz, Jean 2011-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_fac_pubs/207 https://doi.org/10.1029/2011pa002157 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1232/viewcontent/Schmidt_2011_Florida_Straits_deglacial_tempera.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_fac_pubs/207 doi:10.1029/2011pa002157 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1232/viewcontent/Schmidt_2011_Florida_Straits_deglacial_tempera.pdf OES Faculty Publications Atlantic thermohaline circulation Florida Straits Sea surface temperature Intertropical convergence zone Oxygen isotope composition Last glacial maximum Geology Oceanography Paleontology article 2011 ftolddominionuni https://doi.org/10.1029/2011pa002157 2023-05-08T17:59:46Z The prevailing paradigm of abrupt climate change holds that rapid shifts associated with the most extreme climate swings of the last glacial cycle were forced by changes in the strength and northward extension of Atlantic Meridional Overturning Circulation (AMOC), resulting in an abrupt reorganization of atmospheric circulation patterns with global teleconnections. To determine the timing of tropical Atlantic atmospheric circulation changes over the past 21 ka BP, we reconstruct high resolution sea surface temperature and δ18OSW (a proxy for surface salinity) records based on Mg/Ca ratios and oxygen isotope measurements in the planktonic foraminifera Globigerinoides ruber from a sediment core located on the western margin of the Florida Straits. As a proxy for meltwater discharge influence on Florida Straits surface water salinity, we also measured Ba/Ca ratios in G. ruber from the same core. Results show that riverine influence on Florida Straits surface water started by 17.2 ka BP and ended by 13.6 ka BP, 600 years before the start of the Younger Dryas (YD) cold interval. The initiation of the YD is marked by an abrupt increase in Florida Straits δ18OSW values, indicating a shift to elevated sea surface salinity occurring in 130 years, most likely resulting from increased regional aridity and/or reduced precipitation. In order to resolve the timing of tropical atmospheric circulation change relative to AMOC variability across this transition, we compare the timing of surface water changes to a recently published record of Florida Current variability in the same core reconstructed from benthic oxygen isotope measurements. We find synchronous changes in atmospheric and ocean circulation on the transition into the YD, consistent with an abrupt reduction in AMOC as the driver of tropical Atlantic atmospheric circulation change at this time. Article in Journal/Newspaper Planktonic foraminifera Old Dominion University: ODU Digital Commons Paleoceanography 26 4 |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Atlantic thermohaline circulation Florida Straits Sea surface temperature Intertropical convergence zone Oxygen isotope composition Last glacial maximum Geology Oceanography Paleontology |
spellingShingle |
Atlantic thermohaline circulation Florida Straits Sea surface temperature Intertropical convergence zone Oxygen isotope composition Last glacial maximum Geology Oceanography Paleontology Schmidt, Matthew W. Lynch-Stieglitz, Jean Florida Straits Deglacial Temperature and Salinity Change: Implications for Tropical Hydrologic Cycle Variability During the Younger Dryas |
topic_facet |
Atlantic thermohaline circulation Florida Straits Sea surface temperature Intertropical convergence zone Oxygen isotope composition Last glacial maximum Geology Oceanography Paleontology |
description |
The prevailing paradigm of abrupt climate change holds that rapid shifts associated with the most extreme climate swings of the last glacial cycle were forced by changes in the strength and northward extension of Atlantic Meridional Overturning Circulation (AMOC), resulting in an abrupt reorganization of atmospheric circulation patterns with global teleconnections. To determine the timing of tropical Atlantic atmospheric circulation changes over the past 21 ka BP, we reconstruct high resolution sea surface temperature and δ18OSW (a proxy for surface salinity) records based on Mg/Ca ratios and oxygen isotope measurements in the planktonic foraminifera Globigerinoides ruber from a sediment core located on the western margin of the Florida Straits. As a proxy for meltwater discharge influence on Florida Straits surface water salinity, we also measured Ba/Ca ratios in G. ruber from the same core. Results show that riverine influence on Florida Straits surface water started by 17.2 ka BP and ended by 13.6 ka BP, 600 years before the start of the Younger Dryas (YD) cold interval. The initiation of the YD is marked by an abrupt increase in Florida Straits δ18OSW values, indicating a shift to elevated sea surface salinity occurring in 130 years, most likely resulting from increased regional aridity and/or reduced precipitation. In order to resolve the timing of tropical atmospheric circulation change relative to AMOC variability across this transition, we compare the timing of surface water changes to a recently published record of Florida Current variability in the same core reconstructed from benthic oxygen isotope measurements. We find synchronous changes in atmospheric and ocean circulation on the transition into the YD, consistent with an abrupt reduction in AMOC as the driver of tropical Atlantic atmospheric circulation change at this time. |
format |
Article in Journal/Newspaper |
author |
Schmidt, Matthew W. Lynch-Stieglitz, Jean |
author_facet |
Schmidt, Matthew W. Lynch-Stieglitz, Jean |
author_sort |
Schmidt, Matthew W. |
title |
Florida Straits Deglacial Temperature and Salinity Change: Implications for Tropical Hydrologic Cycle Variability During the Younger Dryas |
title_short |
Florida Straits Deglacial Temperature and Salinity Change: Implications for Tropical Hydrologic Cycle Variability During the Younger Dryas |
title_full |
Florida Straits Deglacial Temperature and Salinity Change: Implications for Tropical Hydrologic Cycle Variability During the Younger Dryas |
title_fullStr |
Florida Straits Deglacial Temperature and Salinity Change: Implications for Tropical Hydrologic Cycle Variability During the Younger Dryas |
title_full_unstemmed |
Florida Straits Deglacial Temperature and Salinity Change: Implications for Tropical Hydrologic Cycle Variability During the Younger Dryas |
title_sort |
florida straits deglacial temperature and salinity change: implications for tropical hydrologic cycle variability during the younger dryas |
publisher |
ODU Digital Commons |
publishDate |
2011 |
url |
https://digitalcommons.odu.edu/oeas_fac_pubs/207 https://doi.org/10.1029/2011pa002157 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1232/viewcontent/Schmidt_2011_Florida_Straits_deglacial_tempera.pdf |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
OES Faculty Publications |
op_relation |
https://digitalcommons.odu.edu/oeas_fac_pubs/207 doi:10.1029/2011pa002157 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1232/viewcontent/Schmidt_2011_Florida_Straits_deglacial_tempera.pdf |
op_doi |
https://doi.org/10.1029/2011pa002157 |
container_title |
Paleoceanography |
container_volume |
26 |
container_issue |
4 |
_version_ |
1768373613649461248 |