Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Vema Channel
Oxygen- and carbon-isotopic analyses have been performed on the benthic foraminifer Planulina wuellerstorfi in seven Late Quaternary cores from the Vema Channel-Rio Grande Rise region. The cores are distributed over the water-depth interval of 2340 to 3939 m, which includes the present transition fr...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.726254 2023-05-15T13:42:09+02:00 Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Vema Channel Curry, William B Lohmann, G P MEDIAN LATITUDE: -30.887857 * MEDIAN LONGITUDE: -37.460000 * SOUTH-BOUND LATITUDE: -31.985000 * WEST-BOUND LONGITUDE: -38.838333 * NORTH-BOUND LATITUDE: -29.920000 * EAST-BOUND LONGITUDE: -35.655000 1982-07-29 application/zip, 7 datasets https://doi.pangaea.de/10.1594/PANGAEA.726254 https://doi.org/10.1594/PANGAEA.726254 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.726254 https://doi.org/10.1594/PANGAEA.726254 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Curry, William B; Lohmann, G P (1982): Carbon isotopic changes in benthic foraminifera from the Western South Atlantic: Reconstruction of glacial abyssal circulation patterns. Quaternary Research, 18(2), 218-235, https://doi.org/10.1016/0033-5894(82)90071-0 AII60-13APC CHN115-70PC CHN115-88PC CHN115-89PC CHN115-90PC CHN115-91PC CHN115-92PC PC Piston corer Vema Channel Dataset 1982 ftpangaea https://doi.org/10.1594/PANGAEA.726254 https://doi.org/10.1016/0033-5894(82)90071-0 2023-01-20T07:31:28Z Oxygen- and carbon-isotopic analyses have been performed on the benthic foraminifer Planulina wuellerstorfi in seven Late Quaternary cores from the Vema Channel-Rio Grande Rise region. The cores are distributed over the water-depth interval of 2340 to 3939 m, which includes the present transition from North Atlantic Deep Water (NADW) to Antarctic Bottom Water (AABW). The carbon-isotopic records in the cores vary as a function of water depth. The shallowest and deepest cores show no significant glacial-interglacial difference in delta13C. Four of the five cores presently located in the NADW have benthic foraminiferal delta13C that is lower during glacial isotopic stages. Based on bathymetric gradients in delta13C, we conclude that, like today, there were two water masses present in the Vema Channel during glacial intervals: a water mass enriched in 13C overlying another water mass depleted in 13C. The largest gradient of change of delta13C with depth, however, occurred at 2.7 km, ~1 km shallower than the present position of this gradient. On the basis of paleontologic and sedimentologic evidence, we consider it unlikely that the NADW:AABW transition shallowed to this level. Reduced carbon-isotopic gradients between the deep basins of the North Atlantic and Pacific Oceans during the last glaciation suggest that production of NADW was reduced. Lower production of NADW may have modified the local abyssal circulation pattern in the Vema Channel region. Dataset Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Pacific ENVELOPE(-38.838333,-35.655000,-29.920000,-31.985000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AII60-13APC CHN115-70PC CHN115-88PC CHN115-89PC CHN115-90PC CHN115-91PC CHN115-92PC PC Piston corer Vema Channel |
spellingShingle |
AII60-13APC CHN115-70PC CHN115-88PC CHN115-89PC CHN115-90PC CHN115-91PC CHN115-92PC PC Piston corer Vema Channel Curry, William B Lohmann, G P Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Vema Channel |
topic_facet |
AII60-13APC CHN115-70PC CHN115-88PC CHN115-89PC CHN115-90PC CHN115-91PC CHN115-92PC PC Piston corer Vema Channel |
description |
Oxygen- and carbon-isotopic analyses have been performed on the benthic foraminifer Planulina wuellerstorfi in seven Late Quaternary cores from the Vema Channel-Rio Grande Rise region. The cores are distributed over the water-depth interval of 2340 to 3939 m, which includes the present transition from North Atlantic Deep Water (NADW) to Antarctic Bottom Water (AABW). The carbon-isotopic records in the cores vary as a function of water depth. The shallowest and deepest cores show no significant glacial-interglacial difference in delta13C. Four of the five cores presently located in the NADW have benthic foraminiferal delta13C that is lower during glacial isotopic stages. Based on bathymetric gradients in delta13C, we conclude that, like today, there were two water masses present in the Vema Channel during glacial intervals: a water mass enriched in 13C overlying another water mass depleted in 13C. The largest gradient of change of delta13C with depth, however, occurred at 2.7 km, ~1 km shallower than the present position of this gradient. On the basis of paleontologic and sedimentologic evidence, we consider it unlikely that the NADW:AABW transition shallowed to this level. Reduced carbon-isotopic gradients between the deep basins of the North Atlantic and Pacific Oceans during the last glaciation suggest that production of NADW was reduced. Lower production of NADW may have modified the local abyssal circulation pattern in the Vema Channel region. |
format |
Dataset |
author |
Curry, William B Lohmann, G P |
author_facet |
Curry, William B Lohmann, G P |
author_sort |
Curry, William B |
title |
Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Vema Channel |
title_short |
Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Vema Channel |
title_full |
Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Vema Channel |
title_fullStr |
Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Vema Channel |
title_full_unstemmed |
Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Vema Channel |
title_sort |
stable carbon and oxygen isotope ratios of planulina wuellerstorfi from sediments of the vema channel |
publisher |
PANGAEA |
publishDate |
1982 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.726254 https://doi.org/10.1594/PANGAEA.726254 |
op_coverage |
MEDIAN LATITUDE: -30.887857 * MEDIAN LONGITUDE: -37.460000 * SOUTH-BOUND LATITUDE: -31.985000 * WEST-BOUND LONGITUDE: -38.838333 * NORTH-BOUND LATITUDE: -29.920000 * EAST-BOUND LONGITUDE: -35.655000 |
long_lat |
ENVELOPE(-38.838333,-35.655000,-29.920000,-31.985000) |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_source |
Supplement to: Curry, William B; Lohmann, G P (1982): Carbon isotopic changes in benthic foraminifera from the Western South Atlantic: Reconstruction of glacial abyssal circulation patterns. Quaternary Research, 18(2), 218-235, https://doi.org/10.1016/0033-5894(82)90071-0 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.726254 https://doi.org/10.1594/PANGAEA.726254 |
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.726254 https://doi.org/10.1016/0033-5894(82)90071-0 |
_version_ |
1766163504020062208 |