Stable isotope record of Cibicidoides wuellerstorfi from Pleistocene sediments of DSDP Site 86-502 in the Caribbean Sea
Variations in the stable isotopic composition of benthic foraminifera from Deep-Sea Drilling Project (DSDP) site 502B in the Caribbean Sea are used to reconstruct Atlantic intermediate water circulation variability over the last 1.2 m.y. Comparison of this record with other North Atlantic benthic is...
Main Authors: | , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
1992
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.701470 https://doi.org/10.1594/PANGAEA.701470 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.701470 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.701470 2023-05-15T17:13:54+02:00 Stable isotope record of Cibicidoides wuellerstorfi from Pleistocene sediments of DSDP Site 86-502 in the Caribbean Sea deMenocal, Peter B Oppo, Delia W Fairbanks, Richard G Prell, Warren L MEDIAN LATITUDE: 11.491450 * MEDIAN LONGITUDE: -79.378500 * SOUTH-BOUND LATITUDE: 11.491100 * WEST-BOUND LONGITUDE: -79.378800 * NORTH-BOUND LATITUDE: 11.491800 * EAST-BOUND LONGITUDE: -79.378200 * DATE/TIME START: 1979-08-16T00:00:00 * DATE/TIME END: 1979-08-16T00:00:00 1992-07-18 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.701470 https://doi.org/10.1594/PANGAEA.701470 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.701470 https://doi.org/10.1594/PANGAEA.701470 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: deMenocal, Peter B; Oppo, Delia W; Fairbanks, Richard G; Prell, Warren L (1992): Pleistocene d13C variability of North Atlantic intermediate water. Paleoceanography, 7(2), 229-250, https://doi.org/10.1029/92PA00420 68-502_Site 68-502B Caribbean Sea/RIDGE COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg68 Dataset 1992 ftpangaea https://doi.org/10.1594/PANGAEA.701470 https://doi.org/10.1029/92PA00420 2023-01-20T07:31:13Z Variations in the stable isotopic composition of benthic foraminifera from Deep-Sea Drilling Project (DSDP) site 502B in the Caribbean Sea are used to reconstruct Atlantic intermediate water circulation variability over the last 1.2 m.y. Comparison of this record with other North Atlantic benthic isotope records indicates that Atlantic intermediate water circulation was relatively enhanced during glacial maxima when North Atlantic deep water (NADW) production was reduced. However, a simple, compensatory relationship between intermediate and deepwater circulation is not apparent. Geochemical models have shown that such changes in ocean circulation can affect atmospheric CO2 levels by changing vertical nutrient and alkalinity profiles. The Delta delta13C difference between Caribbean site 502B and deep equatorial Pacific site 677 is highly coherent and in phase with ice volume. Like the delta18O record, there is an increase in amplitude (40%) and a large increase in 100 kyr power after 0.7 Ma. The 1.2 per mil Delta delta13C amplitude scales to 70 ppm V in atmospheric CO2 using Boyle's (1986) box model result. The implied increase in CO2 amplitude after 0.7 Ma may suggest a positive feedback role in effecting the higher-amplitude climatic fluctuations which characterize the last 0.7 m.y. Dataset NADW North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(-79.378800,-79.378200,11.491800,11.491100) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
68-502_Site 68-502B Caribbean Sea/RIDGE COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg68 |
spellingShingle |
68-502_Site 68-502B Caribbean Sea/RIDGE COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg68 deMenocal, Peter B Oppo, Delia W Fairbanks, Richard G Prell, Warren L Stable isotope record of Cibicidoides wuellerstorfi from Pleistocene sediments of DSDP Site 86-502 in the Caribbean Sea |
topic_facet |
68-502_Site 68-502B Caribbean Sea/RIDGE COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg68 |
description |
Variations in the stable isotopic composition of benthic foraminifera from Deep-Sea Drilling Project (DSDP) site 502B in the Caribbean Sea are used to reconstruct Atlantic intermediate water circulation variability over the last 1.2 m.y. Comparison of this record with other North Atlantic benthic isotope records indicates that Atlantic intermediate water circulation was relatively enhanced during glacial maxima when North Atlantic deep water (NADW) production was reduced. However, a simple, compensatory relationship between intermediate and deepwater circulation is not apparent. Geochemical models have shown that such changes in ocean circulation can affect atmospheric CO2 levels by changing vertical nutrient and alkalinity profiles. The Delta delta13C difference between Caribbean site 502B and deep equatorial Pacific site 677 is highly coherent and in phase with ice volume. Like the delta18O record, there is an increase in amplitude (40%) and a large increase in 100 kyr power after 0.7 Ma. The 1.2 per mil Delta delta13C amplitude scales to 70 ppm V in atmospheric CO2 using Boyle's (1986) box model result. The implied increase in CO2 amplitude after 0.7 Ma may suggest a positive feedback role in effecting the higher-amplitude climatic fluctuations which characterize the last 0.7 m.y. |
format |
Dataset |
author |
deMenocal, Peter B Oppo, Delia W Fairbanks, Richard G Prell, Warren L |
author_facet |
deMenocal, Peter B Oppo, Delia W Fairbanks, Richard G Prell, Warren L |
author_sort |
deMenocal, Peter B |
title |
Stable isotope record of Cibicidoides wuellerstorfi from Pleistocene sediments of DSDP Site 86-502 in the Caribbean Sea |
title_short |
Stable isotope record of Cibicidoides wuellerstorfi from Pleistocene sediments of DSDP Site 86-502 in the Caribbean Sea |
title_full |
Stable isotope record of Cibicidoides wuellerstorfi from Pleistocene sediments of DSDP Site 86-502 in the Caribbean Sea |
title_fullStr |
Stable isotope record of Cibicidoides wuellerstorfi from Pleistocene sediments of DSDP Site 86-502 in the Caribbean Sea |
title_full_unstemmed |
Stable isotope record of Cibicidoides wuellerstorfi from Pleistocene sediments of DSDP Site 86-502 in the Caribbean Sea |
title_sort |
stable isotope record of cibicidoides wuellerstorfi from pleistocene sediments of dsdp site 86-502 in the caribbean sea |
publisher |
PANGAEA |
publishDate |
1992 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.701470 https://doi.org/10.1594/PANGAEA.701470 |
op_coverage |
MEDIAN LATITUDE: 11.491450 * MEDIAN LONGITUDE: -79.378500 * SOUTH-BOUND LATITUDE: 11.491100 * WEST-BOUND LONGITUDE: -79.378800 * NORTH-BOUND LATITUDE: 11.491800 * EAST-BOUND LONGITUDE: -79.378200 * DATE/TIME START: 1979-08-16T00:00:00 * DATE/TIME END: 1979-08-16T00:00:00 |
long_lat |
ENVELOPE(-79.378800,-79.378200,11.491800,11.491100) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
Supplement to: deMenocal, Peter B; Oppo, Delia W; Fairbanks, Richard G; Prell, Warren L (1992): Pleistocene d13C variability of North Atlantic intermediate water. Paleoceanography, 7(2), 229-250, https://doi.org/10.1029/92PA00420 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.701470 https://doi.org/10.1594/PANGAEA.701470 |
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.701470 https://doi.org/10.1029/92PA00420 |
_version_ |
1766071096336973824 |