(Table 1) Age determination of western North Atlantic sediment cores
Foraminiferal abundance, 14C ventilation ages, and stable isotope ratios in cores from high deposition rate locations in the western subtropical North Atlantic are used to infer changes in ocean and climate during the Younger Dryas (YD) and Last Glacial Maximum (LGM). The d18O of the surface dwellin...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.837767 2023-05-15T17:25:29+02:00 (Table 1) Age determination of western North Atlantic sediment cores Keigwin, Lloyd D MEDIAN LATITUDE: 31.682593 * MEDIAN LONGITUDE: -75.535143 * SOUTH-BOUND LATITUDE: 28.030000 * WEST-BOUND LONGITUDE: -76.407000 * NORTH-BOUND LATITUDE: 32.988000 * EAST-BOUND LONGITUDE: -72.900000 * MINIMUM DEPTH, sediment/rock: 0.370 m * MAXIMUM DEPTH, sediment/rock: 5.100 m 2004-11-03 text/tab-separated-values, 314 data points https://doi.pangaea.de/10.1594/PANGAEA.837767 https://doi.org/10.1594/PANGAEA.837767 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.837767 https://doi.org/10.1594/PANGAEA.837767 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Keigwin, Lloyd D (2004): Radiocarbon and stable isotope constraints on Last Glacial Maximum and Younger Dryas ventilation in the western North Atlantic. Paleoceanography, 19(4), PA4012, https://doi.org/10.1029/2004PA001029 Age 14C AMS comment dated dated material dated standard deviation Depth bottom/max sediment/rock top/min Elevation of event Event label GC GGC Giant gravity corer Gravity corer JPC Jumbo Piston Core Knorr KNR140 KNR140-01JPC KNR140-02JPC KNR140-12JPC KNR140-2-12JPC KNR140-2-22JPC KNR140-22JPC KNR140-2-30GGC KNR140-2-51GGC KNR140-26GGC KNR140-30GGC KNR140-43GGC KNR140-50GGC KNR140-51GGC KNR140-56GGC KNR140-63JPC KNR140-64GGC KNR140-66GGC KNR140-67JPC Laboratory code/label Latitude of event Longitude of event North Atlantic Ocean Ocean Drilling Program ODP Dataset 2004 ftpangaea https://doi.org/10.1594/PANGAEA.837767 https://doi.org/10.1029/2004PA001029 2023-01-20T09:04:15Z Foraminiferal abundance, 14C ventilation ages, and stable isotope ratios in cores from high deposition rate locations in the western subtropical North Atlantic are used to infer changes in ocean and climate during the Younger Dryas (YD) and Last Glacial Maximum (LGM). The d18O of the surface dwelling planktonic foram Globigerinoides ruber records the present-day decrease in surface temperature (SST) of ~4°C from Gulf Stream waters to the northeastern Bermuda Rise. If during the LGM the modern d18O/salinity relationship was maintained, this SST contrast was reduced to 2°C. With LGM to interglacial d18O changes of at least 2.2 per mil, SSTs in the western subtropical gyre may have been as much as 5°C colder. Above ~2.3 km, glacial d13C was higher than today, consistent with nutrient-depleted (younger) bottom waters, as identified previously. Below that, d13C decreased continually to -0.5 per mil, about equal to the lowest LGM d13C in the North Pacific Ocean. Seven pairs of benthic and planktonic foraminiferal 14C dates from cores >2.5 km deep differ by 1100 ± 340 years, with a maximum apparent ventilation age of ~1500 years at 4250 m and at ~4700 m. Apparent ventilation ages are presently unavailable for the LGM < 2.5 km because of problems with reworking on the continental slope when sea level was low. Because LGM d13C is about the same in the deep North Atlantic and the deep North Pacific, and because the oldest apparent ventilation ages in the LGM North Atlantic are the same as the North Pacific today, it is possible that the same water mass, probably of southern origin, flowed deep within each basin during the LGM. Very early in the YD, dated here at 11.25 ± 0.25 (n = 10) conventional 14C kyr BP (equal to 12.9 calendar kyr BP), apparent ventilation ages <2.3 km water depth were about the same as North Atlantic Deep Water today. Below ~2.3 km, four YD pairs average 1030 ± 400 years. The oldest apparent ventilation age for the YD is 1600 years at 4250 m. This strong contrast in ventilation, which ... Dataset North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(-76.407000,-72.900000,32.988000,28.030000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Age 14C AMS comment dated dated material dated standard deviation Depth bottom/max sediment/rock top/min Elevation of event Event label GC GGC Giant gravity corer Gravity corer JPC Jumbo Piston Core Knorr KNR140 KNR140-01JPC KNR140-02JPC KNR140-12JPC KNR140-2-12JPC KNR140-2-22JPC KNR140-22JPC KNR140-2-30GGC KNR140-2-51GGC KNR140-26GGC KNR140-30GGC KNR140-43GGC KNR140-50GGC KNR140-51GGC KNR140-56GGC KNR140-63JPC KNR140-64GGC KNR140-66GGC KNR140-67JPC Laboratory code/label Latitude of event Longitude of event North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
Age 14C AMS comment dated dated material dated standard deviation Depth bottom/max sediment/rock top/min Elevation of event Event label GC GGC Giant gravity corer Gravity corer JPC Jumbo Piston Core Knorr KNR140 KNR140-01JPC KNR140-02JPC KNR140-12JPC KNR140-2-12JPC KNR140-2-22JPC KNR140-22JPC KNR140-2-30GGC KNR140-2-51GGC KNR140-26GGC KNR140-30GGC KNR140-43GGC KNR140-50GGC KNR140-51GGC KNR140-56GGC KNR140-63JPC KNR140-64GGC KNR140-66GGC KNR140-67JPC Laboratory code/label Latitude of event Longitude of event North Atlantic Ocean Ocean Drilling Program ODP Keigwin, Lloyd D (Table 1) Age determination of western North Atlantic sediment cores |
topic_facet |
Age 14C AMS comment dated dated material dated standard deviation Depth bottom/max sediment/rock top/min Elevation of event Event label GC GGC Giant gravity corer Gravity corer JPC Jumbo Piston Core Knorr KNR140 KNR140-01JPC KNR140-02JPC KNR140-12JPC KNR140-2-12JPC KNR140-2-22JPC KNR140-22JPC KNR140-2-30GGC KNR140-2-51GGC KNR140-26GGC KNR140-30GGC KNR140-43GGC KNR140-50GGC KNR140-51GGC KNR140-56GGC KNR140-63JPC KNR140-64GGC KNR140-66GGC KNR140-67JPC Laboratory code/label Latitude of event Longitude of event North Atlantic Ocean Ocean Drilling Program ODP |
description |
Foraminiferal abundance, 14C ventilation ages, and stable isotope ratios in cores from high deposition rate locations in the western subtropical North Atlantic are used to infer changes in ocean and climate during the Younger Dryas (YD) and Last Glacial Maximum (LGM). The d18O of the surface dwelling planktonic foram Globigerinoides ruber records the present-day decrease in surface temperature (SST) of ~4°C from Gulf Stream waters to the northeastern Bermuda Rise. If during the LGM the modern d18O/salinity relationship was maintained, this SST contrast was reduced to 2°C. With LGM to interglacial d18O changes of at least 2.2 per mil, SSTs in the western subtropical gyre may have been as much as 5°C colder. Above ~2.3 km, glacial d13C was higher than today, consistent with nutrient-depleted (younger) bottom waters, as identified previously. Below that, d13C decreased continually to -0.5 per mil, about equal to the lowest LGM d13C in the North Pacific Ocean. Seven pairs of benthic and planktonic foraminiferal 14C dates from cores >2.5 km deep differ by 1100 ± 340 years, with a maximum apparent ventilation age of ~1500 years at 4250 m and at ~4700 m. Apparent ventilation ages are presently unavailable for the LGM < 2.5 km because of problems with reworking on the continental slope when sea level was low. Because LGM d13C is about the same in the deep North Atlantic and the deep North Pacific, and because the oldest apparent ventilation ages in the LGM North Atlantic are the same as the North Pacific today, it is possible that the same water mass, probably of southern origin, flowed deep within each basin during the LGM. Very early in the YD, dated here at 11.25 ± 0.25 (n = 10) conventional 14C kyr BP (equal to 12.9 calendar kyr BP), apparent ventilation ages <2.3 km water depth were about the same as North Atlantic Deep Water today. Below ~2.3 km, four YD pairs average 1030 ± 400 years. The oldest apparent ventilation age for the YD is 1600 years at 4250 m. This strong contrast in ventilation, which ... |
format |
Dataset |
author |
Keigwin, Lloyd D |
author_facet |
Keigwin, Lloyd D |
author_sort |
Keigwin, Lloyd D |
title |
(Table 1) Age determination of western North Atlantic sediment cores |
title_short |
(Table 1) Age determination of western North Atlantic sediment cores |
title_full |
(Table 1) Age determination of western North Atlantic sediment cores |
title_fullStr |
(Table 1) Age determination of western North Atlantic sediment cores |
title_full_unstemmed |
(Table 1) Age determination of western North Atlantic sediment cores |
title_sort |
(table 1) age determination of western north atlantic sediment cores |
publisher |
PANGAEA |
publishDate |
2004 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.837767 https://doi.org/10.1594/PANGAEA.837767 |
op_coverage |
MEDIAN LATITUDE: 31.682593 * MEDIAN LONGITUDE: -75.535143 * SOUTH-BOUND LATITUDE: 28.030000 * WEST-BOUND LONGITUDE: -76.407000 * NORTH-BOUND LATITUDE: 32.988000 * EAST-BOUND LONGITUDE: -72.900000 * MINIMUM DEPTH, sediment/rock: 0.370 m * MAXIMUM DEPTH, sediment/rock: 5.100 m |
long_lat |
ENVELOPE(-76.407000,-72.900000,32.988000,28.030000) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_source |
Supplement to: Keigwin, Lloyd D (2004): Radiocarbon and stable isotope constraints on Last Glacial Maximum and Younger Dryas ventilation in the western North Atlantic. Paleoceanography, 19(4), PA4012, https://doi.org/10.1029/2004PA001029 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.837767 https://doi.org/10.1594/PANGAEA.837767 |
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.837767 https://doi.org/10.1029/2004PA001029 |
_version_ |
1766116933799772160 |