Age determination of ODP Hole 145-887
Atmospheric carbon dioxide concentrations were significantly lower during glacial periods than during intervening interglacial periods, but the mechanisms responsible for this difference remain uncertain. Many recent explanations call on greater carbon storage in a poorly ventilated deep ocean durin...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.769777 2023-05-15T17:35:58+02:00 Age determination of ODP Hole 145-887 Galbraith, Eric Douglas Jaccard, Samuel L Pedersen, Thomas F Sigman, Daniel M Haug, Gerald H Cook, Mea S Southon, John R Francois, Roger LATITUDE: 54.365500 * LONGITUDE: -148.446000 * DATE/TIME START: 1992-09-09T00:00:00 * DATE/TIME END: 1992-09-16T00:00:00 2007-09-14 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.769777 https://doi.org/10.1594/PANGAEA.769777 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.769777 https://doi.org/10.1594/PANGAEA.769777 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Galbraith, Eric Douglas; Jaccard, Samuel L; Pedersen, Thomas F; Sigman, Daniel M; Haug, Gerald H; Cook, Mea S; Southon, John R; Francois, Roger (2007): Carbon dioxide release from the North Pacific abyss during the last deglaciation. Nature, 449(7164), 890-894, https://doi.org/10.1038/nature06227 145-887 COMPCORE Composite Core Joides Resolution Leg145 North Pacific Ocean Ocean Drilling Program ODP Dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.769777 https://doi.org/10.1038/nature06227 2023-01-20T07:32:18Z Atmospheric carbon dioxide concentrations were significantly lower during glacial periods than during intervening interglacial periods, but the mechanisms responsible for this difference remain uncertain. Many recent explanations call on greater carbon storage in a poorly ventilated deep ocean during glacial periods (Trancois et al., 1997, doi:10.1038/40073; Toggweiler, 1999, doi:10.1029/1999PA900033; Stephens and Keeling, 2000, doi:10.1038/35004556; Marchitto et al., 2007, doi:10.1126/science.1138679; Sigman and Boyle, 2000, doi:10.1038/35038000), but direct evidence regarding the ventilation and respired carbon content of the glacial deep ocean is sparse and often equivocal (Broecker et al., 2004, doi:10.1126/science.1102293). Here we present sedimentary geochemical records from sites spanning the deep subarctic Pacific that -together with previously published results (Keigwin, 1998, doi:10.1029/98PA00874)- show that a poorly ventilated water mass containing a high concentration of respired carbon dioxide occupied the North Pacific abyss during the Last Glacial Maximum. Despite an inferred increase in deep Southern Ocean ventilation during the first step of the deglaciation (18,000-15,000 years ago) (Marchitto et al., 2007, doi:10.1126/science.1138679; Monnin et al., 2001, doi:10.1126/science.291.5501.112), we find no evidence for improved ventilation in the abyssal subarctic Pacific until a rapid transition ~14,600 years ago: this change was accompanied by an acceleration of export production from the surface waters above but only a small increase in atmospheric carbon dioxide concentration (Monnin et al., 2001, doi:10.1126/science.291.5501.112). We speculate that these changes were mechanistically linked to a roughly coeval increase in deep water formation in the North Atlantic (Robinson et al., 2005, doi:10.1126/science.1114832; Skinner nd Shackleton, 2004, doi:10.1029/2003PA000983; McManus et al., 2004, doi:10.1038/nature02494), which flushed respired carbon dioxide from northern abyssal waters, but also ... Dataset North Atlantic Southern Ocean Subarctic PANGAEA - Data Publisher for Earth & Environmental Science Southern Ocean Shackleton Pacific ENVELOPE(-148.446000,-148.446000,54.365500,54.365500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
145-887 COMPCORE Composite Core Joides Resolution Leg145 North Pacific Ocean Ocean Drilling Program ODP |
spellingShingle |
145-887 COMPCORE Composite Core Joides Resolution Leg145 North Pacific Ocean Ocean Drilling Program ODP Galbraith, Eric Douglas Jaccard, Samuel L Pedersen, Thomas F Sigman, Daniel M Haug, Gerald H Cook, Mea S Southon, John R Francois, Roger Age determination of ODP Hole 145-887 |
topic_facet |
145-887 COMPCORE Composite Core Joides Resolution Leg145 North Pacific Ocean Ocean Drilling Program ODP |
description |
Atmospheric carbon dioxide concentrations were significantly lower during glacial periods than during intervening interglacial periods, but the mechanisms responsible for this difference remain uncertain. Many recent explanations call on greater carbon storage in a poorly ventilated deep ocean during glacial periods (Trancois et al., 1997, doi:10.1038/40073; Toggweiler, 1999, doi:10.1029/1999PA900033; Stephens and Keeling, 2000, doi:10.1038/35004556; Marchitto et al., 2007, doi:10.1126/science.1138679; Sigman and Boyle, 2000, doi:10.1038/35038000), but direct evidence regarding the ventilation and respired carbon content of the glacial deep ocean is sparse and often equivocal (Broecker et al., 2004, doi:10.1126/science.1102293). Here we present sedimentary geochemical records from sites spanning the deep subarctic Pacific that -together with previously published results (Keigwin, 1998, doi:10.1029/98PA00874)- show that a poorly ventilated water mass containing a high concentration of respired carbon dioxide occupied the North Pacific abyss during the Last Glacial Maximum. Despite an inferred increase in deep Southern Ocean ventilation during the first step of the deglaciation (18,000-15,000 years ago) (Marchitto et al., 2007, doi:10.1126/science.1138679; Monnin et al., 2001, doi:10.1126/science.291.5501.112), we find no evidence for improved ventilation in the abyssal subarctic Pacific until a rapid transition ~14,600 years ago: this change was accompanied by an acceleration of export production from the surface waters above but only a small increase in atmospheric carbon dioxide concentration (Monnin et al., 2001, doi:10.1126/science.291.5501.112). We speculate that these changes were mechanistically linked to a roughly coeval increase in deep water formation in the North Atlantic (Robinson et al., 2005, doi:10.1126/science.1114832; Skinner nd Shackleton, 2004, doi:10.1029/2003PA000983; McManus et al., 2004, doi:10.1038/nature02494), which flushed respired carbon dioxide from northern abyssal waters, but also ... |
format |
Dataset |
author |
Galbraith, Eric Douglas Jaccard, Samuel L Pedersen, Thomas F Sigman, Daniel M Haug, Gerald H Cook, Mea S Southon, John R Francois, Roger |
author_facet |
Galbraith, Eric Douglas Jaccard, Samuel L Pedersen, Thomas F Sigman, Daniel M Haug, Gerald H Cook, Mea S Southon, John R Francois, Roger |
author_sort |
Galbraith, Eric Douglas |
title |
Age determination of ODP Hole 145-887 |
title_short |
Age determination of ODP Hole 145-887 |
title_full |
Age determination of ODP Hole 145-887 |
title_fullStr |
Age determination of ODP Hole 145-887 |
title_full_unstemmed |
Age determination of ODP Hole 145-887 |
title_sort |
age determination of odp hole 145-887 |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.769777 https://doi.org/10.1594/PANGAEA.769777 |
op_coverage |
LATITUDE: 54.365500 * LONGITUDE: -148.446000 * DATE/TIME START: 1992-09-09T00:00:00 * DATE/TIME END: 1992-09-16T00:00:00 |
long_lat |
ENVELOPE(-148.446000,-148.446000,54.365500,54.365500) |
geographic |
Southern Ocean Shackleton Pacific |
geographic_facet |
Southern Ocean Shackleton Pacific |
genre |
North Atlantic Southern Ocean Subarctic |
genre_facet |
North Atlantic Southern Ocean Subarctic |
op_source |
Supplement to: Galbraith, Eric Douglas; Jaccard, Samuel L; Pedersen, Thomas F; Sigman, Daniel M; Haug, Gerald H; Cook, Mea S; Southon, John R; Francois, Roger (2007): Carbon dioxide release from the North Pacific abyss during the last deglaciation. Nature, 449(7164), 890-894, https://doi.org/10.1038/nature06227 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.769777 https://doi.org/10.1594/PANGAEA.769777 |
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.769777 https://doi.org/10.1038/nature06227 |
_version_ |
1766135279895183360 |