Stable isotope record of bentic foraminifera in sediment cores of the eastern Pacific
Stable isotopes in benthic foraminifera from Pacific sediments are used to assess hypotheses of systematic shifts in the depth distribution of oceanic nutrients and carbon during the ice ages. The carbon isotope differences between ~1400 and ~3200 m depth in the eastern Pacific are consistently grea...
Main Authors: | , , , , , |
---|---|
Format: | Other/Unknown Material |
Language: | English |
Published: |
PANGAEA
1991
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.701404 https://doi.org/10.1594/PANGAEA.701404 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.701404 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.701404 2024-09-09T19:56:38+00:00 Stable isotope record of bentic foraminifera in sediment cores of the eastern Pacific Mix, Alan C Pisias, Nicklas G Zahn, Rainer Rugh, W D Lopez, Cody Nelson, K MEDIAN LATITUDE: -0.282000 * MEDIAN LONGITUDE: -88.860000 * SOUTH-BOUND LATITUDE: -0.467000 * WEST-BOUND LONGITUDE: -95.650000 * NORTH-BOUND LATITUDE: -0.097000 * EAST-BOUND LONGITUDE: -82.070000 * DATE/TIME START: 1963-04-05T00:00:00 * DATE/TIME END: 1970-04-26T00:00:00 1991 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.701404 https://doi.org/10.1594/PANGAEA.701404 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.701404 https://doi.org/10.1594/PANGAEA.701404 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Mix, Alan C; Pisias, Nicklas G; Zahn, Rainer; Rugh, W D; Lopez, Cody; Nelson, K (1991): Carbon 13 in Pacific deep and intermediate waters, 0-370 ka: implications for ocean circulation and Pleistocene CO2. Paleoceanography, 6(2), 205-226, https://doi.org/10.1029/90PA02303 PC Piston corer RC13 RC13-110 Robert Conrad V19 V19-27 Vema dataset publication series 1991 ftpangaea https://doi.org/10.1594/PANGAEA.70140410.1029/90PA02303 2024-07-24T02:31:42Z Stable isotopes in benthic foraminifera from Pacific sediments are used to assess hypotheses of systematic shifts in the depth distribution of oceanic nutrients and carbon during the ice ages. The carbon isotope differences between ~1400 and ~3200 m depth in the eastern Pacific are consistently greater in glacial than interglacial maxima over the last ~370 kyr. This phenomenon of "bottom heavy" glacial nutrient distributions, which Boyle proposed as a cause of Pleistocene CO2 change, occurs primarily in the 1/100 and 1/41 kyr**-1 "Milankovitch" orbital frequency bands but appears to lack a coherent 1/23 kyr**-1 band related to orbital precession. Averaged over oxygen-isotope stages, glacial delta13C gradients from ~1400 to ~3200 m depth are 0.1 per mil greater than interglacial gradients. The range of extreme shifts is somewhat larger, 0.2 to 0.5 per mil . In both cases, these changes in Pacific delta13C distributions are much smaller than observed in shorter records from the North Atlantic. This may be too small to be a dominant cause of atmospheric pCO2 change, unless current models underestimate the sensitivity of pCO2 to nutrient redistributions. This dampening of Pacific relative to Atlantic delta13C depth gradient favors a North Atlantic origin of the phenomenon, although local variations of Pacific intermediate water masses can not be excluded at present. Other/Unknown Material North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(-95.650000,-82.070000,-0.097000,-0.467000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
PC Piston corer RC13 RC13-110 Robert Conrad V19 V19-27 Vema |
spellingShingle |
PC Piston corer RC13 RC13-110 Robert Conrad V19 V19-27 Vema Mix, Alan C Pisias, Nicklas G Zahn, Rainer Rugh, W D Lopez, Cody Nelson, K Stable isotope record of bentic foraminifera in sediment cores of the eastern Pacific |
topic_facet |
PC Piston corer RC13 RC13-110 Robert Conrad V19 V19-27 Vema |
description |
Stable isotopes in benthic foraminifera from Pacific sediments are used to assess hypotheses of systematic shifts in the depth distribution of oceanic nutrients and carbon during the ice ages. The carbon isotope differences between ~1400 and ~3200 m depth in the eastern Pacific are consistently greater in glacial than interglacial maxima over the last ~370 kyr. This phenomenon of "bottom heavy" glacial nutrient distributions, which Boyle proposed as a cause of Pleistocene CO2 change, occurs primarily in the 1/100 and 1/41 kyr**-1 "Milankovitch" orbital frequency bands but appears to lack a coherent 1/23 kyr**-1 band related to orbital precession. Averaged over oxygen-isotope stages, glacial delta13C gradients from ~1400 to ~3200 m depth are 0.1 per mil greater than interglacial gradients. The range of extreme shifts is somewhat larger, 0.2 to 0.5 per mil . In both cases, these changes in Pacific delta13C distributions are much smaller than observed in shorter records from the North Atlantic. This may be too small to be a dominant cause of atmospheric pCO2 change, unless current models underestimate the sensitivity of pCO2 to nutrient redistributions. This dampening of Pacific relative to Atlantic delta13C depth gradient favors a North Atlantic origin of the phenomenon, although local variations of Pacific intermediate water masses can not be excluded at present. |
format |
Other/Unknown Material |
author |
Mix, Alan C Pisias, Nicklas G Zahn, Rainer Rugh, W D Lopez, Cody Nelson, K |
author_facet |
Mix, Alan C Pisias, Nicklas G Zahn, Rainer Rugh, W D Lopez, Cody Nelson, K |
author_sort |
Mix, Alan C |
title |
Stable isotope record of bentic foraminifera in sediment cores of the eastern Pacific |
title_short |
Stable isotope record of bentic foraminifera in sediment cores of the eastern Pacific |
title_full |
Stable isotope record of bentic foraminifera in sediment cores of the eastern Pacific |
title_fullStr |
Stable isotope record of bentic foraminifera in sediment cores of the eastern Pacific |
title_full_unstemmed |
Stable isotope record of bentic foraminifera in sediment cores of the eastern Pacific |
title_sort |
stable isotope record of bentic foraminifera in sediment cores of the eastern pacific |
publisher |
PANGAEA |
publishDate |
1991 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.701404 https://doi.org/10.1594/PANGAEA.701404 |
op_coverage |
MEDIAN LATITUDE: -0.282000 * MEDIAN LONGITUDE: -88.860000 * SOUTH-BOUND LATITUDE: -0.467000 * WEST-BOUND LONGITUDE: -95.650000 * NORTH-BOUND LATITUDE: -0.097000 * EAST-BOUND LONGITUDE: -82.070000 * DATE/TIME START: 1963-04-05T00:00:00 * DATE/TIME END: 1970-04-26T00:00:00 |
long_lat |
ENVELOPE(-95.650000,-82.070000,-0.097000,-0.467000) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Mix, Alan C; Pisias, Nicklas G; Zahn, Rainer; Rugh, W D; Lopez, Cody; Nelson, K (1991): Carbon 13 in Pacific deep and intermediate waters, 0-370 ka: implications for ocean circulation and Pleistocene CO2. Paleoceanography, 6(2), 205-226, https://doi.org/10.1029/90PA02303 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.701404 https://doi.org/10.1594/PANGAEA.701404 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.70140410.1029/90PA02303 |
_version_ |
1809927406937440256 |