(Table 1) Age determination of sediment cores CH07-98-22 and KNR140-2-59
Western subtropical North Atlantic oceanic and atmospheric circulations connect tropical and subpolar climates. Variations in these circulations can generate regional climate anomalies that are not reflected in Northern Hemisphere averages. Assessing the significance of anthropogenic climate change...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.830724 2023-05-15T17:28:35+02:00 (Table 1) Age determination of sediment cores CH07-98-22 and KNR140-2-59 Saenger, Casey Came, Rosemarie E Oppo, Delia W Keigwin, Lloyd D Cohen, Anne L MEDIAN LATITUDE: 32.880500 * MEDIAN LONGITUDE: -76.296000 * SOUTH-BOUND LATITUDE: 32.784000 * WEST-BOUND LONGITUDE: -76.316000 * NORTH-BOUND LATITUDE: 32.977000 * EAST-BOUND LONGITUDE: -76.276000 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 2.970 m 2011-03-19 text/tab-separated-values, 70 data points https://doi.pangaea.de/10.1594/PANGAEA.830724 https://doi.org/10.1594/PANGAEA.830724 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.830724 https://doi.org/10.1594/PANGAEA.830724 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Saenger, Casey; Came, Rosemarie E; Oppo, Delia W; Keigwin, Lloyd D; Cohen, Anne L (2011): Regional climate variability in the western subtropical North Atlantic during the past two millennia. Paleoceanography, 26(2), PA2206, https://doi.org/10.1029/2010PA002038 Age 14C AMS 14C milieu/reservoir corrected comment dated dated material dated standard deviation Calendar age standard deviation CH07-98-22 Depth bottom/max sediment/rock top/min Event label GGC Giant gravity corer Knorr KNR140 KNR140-2-59 Laboratory code/label MUC MultiCorer North Atlantic Dataset 2011 ftpangaea https://doi.org/10.1594/PANGAEA.830724 https://doi.org/10.1029/2010PA002038 2023-01-20T09:03:08Z Western subtropical North Atlantic oceanic and atmospheric circulations connect tropical and subpolar climates. Variations in these circulations can generate regional climate anomalies that are not reflected in Northern Hemisphere averages. Assessing the significance of anthropogenic climate change at regional scales requires proxy records that allow recent trends to be interpreted in the context of long-term regional variability. We present reconstructions of Gulf Stream sea surface temperature (SST) and hydrographic variability during the past two millennia based on the magnesium/calcium ratio and oxygen isotopic composition of planktic foraminifera preserved in two western subtropical North Atlantic sediment cores. Reconstructed SST suggests low-frequency variability of ~1°C during an interval that includes the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA). A warm interval near 1250 A.D. is distinct from regional and hemispheric temperature, possibly reflecting regional variations in ocean-atmosphere heat flux associated with changes in atmospheric circulation (e.g., the North Atlantic Oscillation) or the Atlantic Meridional Overturning Circulation. Seawater d18O, which is marked by a fresher MCA and a more saline LIA, covaries with meridional migrations of the Atlantic Intertropical Convergence Zone. The northward advection of tropical salinity anomalies by mean surface currents provides a plausible mechanism linking Carolina Slope and tropical Atlantic hydrology. Dataset North Atlantic North Atlantic oscillation PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-76.316000,-76.276000,32.977000,32.784000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Age 14C AMS 14C milieu/reservoir corrected comment dated dated material dated standard deviation Calendar age standard deviation CH07-98-22 Depth bottom/max sediment/rock top/min Event label GGC Giant gravity corer Knorr KNR140 KNR140-2-59 Laboratory code/label MUC MultiCorer North Atlantic |
spellingShingle |
Age 14C AMS 14C milieu/reservoir corrected comment dated dated material dated standard deviation Calendar age standard deviation CH07-98-22 Depth bottom/max sediment/rock top/min Event label GGC Giant gravity corer Knorr KNR140 KNR140-2-59 Laboratory code/label MUC MultiCorer North Atlantic Saenger, Casey Came, Rosemarie E Oppo, Delia W Keigwin, Lloyd D Cohen, Anne L (Table 1) Age determination of sediment cores CH07-98-22 and KNR140-2-59 |
topic_facet |
Age 14C AMS 14C milieu/reservoir corrected comment dated dated material dated standard deviation Calendar age standard deviation CH07-98-22 Depth bottom/max sediment/rock top/min Event label GGC Giant gravity corer Knorr KNR140 KNR140-2-59 Laboratory code/label MUC MultiCorer North Atlantic |
description |
Western subtropical North Atlantic oceanic and atmospheric circulations connect tropical and subpolar climates. Variations in these circulations can generate regional climate anomalies that are not reflected in Northern Hemisphere averages. Assessing the significance of anthropogenic climate change at regional scales requires proxy records that allow recent trends to be interpreted in the context of long-term regional variability. We present reconstructions of Gulf Stream sea surface temperature (SST) and hydrographic variability during the past two millennia based on the magnesium/calcium ratio and oxygen isotopic composition of planktic foraminifera preserved in two western subtropical North Atlantic sediment cores. Reconstructed SST suggests low-frequency variability of ~1°C during an interval that includes the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA). A warm interval near 1250 A.D. is distinct from regional and hemispheric temperature, possibly reflecting regional variations in ocean-atmosphere heat flux associated with changes in atmospheric circulation (e.g., the North Atlantic Oscillation) or the Atlantic Meridional Overturning Circulation. Seawater d18O, which is marked by a fresher MCA and a more saline LIA, covaries with meridional migrations of the Atlantic Intertropical Convergence Zone. The northward advection of tropical salinity anomalies by mean surface currents provides a plausible mechanism linking Carolina Slope and tropical Atlantic hydrology. |
format |
Dataset |
author |
Saenger, Casey Came, Rosemarie E Oppo, Delia W Keigwin, Lloyd D Cohen, Anne L |
author_facet |
Saenger, Casey Came, Rosemarie E Oppo, Delia W Keigwin, Lloyd D Cohen, Anne L |
author_sort |
Saenger, Casey |
title |
(Table 1) Age determination of sediment cores CH07-98-22 and KNR140-2-59 |
title_short |
(Table 1) Age determination of sediment cores CH07-98-22 and KNR140-2-59 |
title_full |
(Table 1) Age determination of sediment cores CH07-98-22 and KNR140-2-59 |
title_fullStr |
(Table 1) Age determination of sediment cores CH07-98-22 and KNR140-2-59 |
title_full_unstemmed |
(Table 1) Age determination of sediment cores CH07-98-22 and KNR140-2-59 |
title_sort |
(table 1) age determination of sediment cores ch07-98-22 and knr140-2-59 |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.830724 https://doi.org/10.1594/PANGAEA.830724 |
op_coverage |
MEDIAN LATITUDE: 32.880500 * MEDIAN LONGITUDE: -76.296000 * SOUTH-BOUND LATITUDE: 32.784000 * WEST-BOUND LONGITUDE: -76.316000 * NORTH-BOUND LATITUDE: 32.977000 * EAST-BOUND LONGITUDE: -76.276000 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 2.970 m |
long_lat |
ENVELOPE(-76.316000,-76.276000,32.977000,32.784000) |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Supplement to: Saenger, Casey; Came, Rosemarie E; Oppo, Delia W; Keigwin, Lloyd D; Cohen, Anne L (2011): Regional climate variability in the western subtropical North Atlantic during the past two millennia. Paleoceanography, 26(2), PA2206, https://doi.org/10.1029/2010PA002038 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.830724 https://doi.org/10.1594/PANGAEA.830724 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.830724 https://doi.org/10.1029/2010PA002038 |
_version_ |
1766121344558170112 |