Deep water formation in the North Pacific and deglacial CO2 rise
Deep water formation in the North Atlantic and Southern Ocean is widely thought to influence deglacial CO2 rise and climate change; here we suggest that deep water formation in the North Pacific may also play an important role. We present paired radiocarbon and boron isotope data from foraminifera f...
Published in: | Paleoceanography |
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Language: | English |
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2014
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Online Access: | https://hdl.handle.net/1983/af90146b-ec53-4a7d-b53f-8fbb9a2ff0cb https://research-information.bris.ac.uk/en/publications/af90146b-ec53-4a7d-b53f-8fbb9a2ff0cb https://doi.org/10.1002/2013PA002570 |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/af90146b-ec53-4a7d-b53f-8fbb9a2ff0cb 2024-05-12T08:08:27+00:00 Deep water formation in the North Pacific and deglacial CO2 rise Rae, James W. B. Sarnthein, Michael Foster, Gavin L. Ridgwell, Andy Grootes, Pieter M. Elliott, Tim 2014-06 https://hdl.handle.net/1983/af90146b-ec53-4a7d-b53f-8fbb9a2ff0cb https://research-information.bris.ac.uk/en/publications/af90146b-ec53-4a7d-b53f-8fbb9a2ff0cb https://doi.org/10.1002/2013PA002570 eng eng https://research-information.bris.ac.uk/en/publications/af90146b-ec53-4a7d-b53f-8fbb9a2ff0cb info:eu-repo/semantics/restrictedAccess Rae , J W B , Sarnthein , M , Foster , G L , Ridgwell , A , Grootes , P M & Elliott , T 2014 , ' Deep water formation in the North Pacific and deglacial CO2 rise ' , Paleoceanography , vol. 29 , no. 6 , pp. 645-667 . https://doi.org/10.1002/2013PA002570 LAST GLACIAL TERMINATION MERIDIONAL OVERTURNING CIRCULATION HIGH-RESOLUTION RECORD RAPID CLIMATE-CHANGE SANTA-BARBARA BASIN ATMOSPHERIC CO2 OCEAN CIRCULATION HIGH-LATITUDE ICE CORES THERMOHALINE CIRCULATION article 2014 ftubristolcris https://doi.org/10.1002/2013PA002570 2024-04-17T14:18:44Z Deep water formation in the North Atlantic and Southern Ocean is widely thought to influence deglacial CO2 rise and climate change; here we suggest that deep water formation in the North Pacific may also play an important role. We present paired radiocarbon and boron isotope data from foraminifera from sediment core MD02-2489 at 3640m in the North East Pacific. These show a pronounced excursion during Heinrich Stadial 1, with benthic-planktic radiocarbon offsets dropping to similar to 350 years, accompanied by a decrease in benthic delta B-11. We suggest that this is driven by the onset of deep convection in the North Pacific, which mixes young shallow waters to depth, old deep waters to the surface, and low-pH water from intermediate depths into the deep ocean. This deep water formation event was likely driven by an increase in surface salinity, due to subdued atmospheric/monsoonal freshwater flux during Heinrich Stadial 1. The ability of North Pacific Deep Water (NPDW) formation to explain the excursions seen in our data is demonstrated in a series of experiments with an intermediate complexity Earth system model. These experiments also show that breakdown of stratification in the North Pacific leads to a rapid similar to 30 ppm increase in atmospheric CO2, along with decreases in atmospheric delta C-13 and Delta C-14, consistent with observations of the early deglaciation. Our inference of deep water formation is based mainly on results from a single sediment core, and our boron isotope data are unavoidably sparse in the key HS1 interval, so this hypothesis merits further testing. However, we note that there is independent support for breakdown of stratification in shallower waters during this period, including a minimum in delta N-15, younging in intermediate water C-14, and regional warming. We also re-evaluate deglacial changes in North Pacific productivity and carbonate preservation in light of our new data and suggest that the regional pulse of export production observed during the Bolling-Allerod is ... Article in Journal/Newspaper North Atlantic Southern Ocean University of Bristol: Bristol Research Pacific Southern Ocean Paleoceanography 29 6 645 667 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
LAST GLACIAL TERMINATION MERIDIONAL OVERTURNING CIRCULATION HIGH-RESOLUTION RECORD RAPID CLIMATE-CHANGE SANTA-BARBARA BASIN ATMOSPHERIC CO2 OCEAN CIRCULATION HIGH-LATITUDE ICE CORES THERMOHALINE CIRCULATION |
spellingShingle |
LAST GLACIAL TERMINATION MERIDIONAL OVERTURNING CIRCULATION HIGH-RESOLUTION RECORD RAPID CLIMATE-CHANGE SANTA-BARBARA BASIN ATMOSPHERIC CO2 OCEAN CIRCULATION HIGH-LATITUDE ICE CORES THERMOHALINE CIRCULATION Rae, James W. B. Sarnthein, Michael Foster, Gavin L. Ridgwell, Andy Grootes, Pieter M. Elliott, Tim Deep water formation in the North Pacific and deglacial CO2 rise |
topic_facet |
LAST GLACIAL TERMINATION MERIDIONAL OVERTURNING CIRCULATION HIGH-RESOLUTION RECORD RAPID CLIMATE-CHANGE SANTA-BARBARA BASIN ATMOSPHERIC CO2 OCEAN CIRCULATION HIGH-LATITUDE ICE CORES THERMOHALINE CIRCULATION |
description |
Deep water formation in the North Atlantic and Southern Ocean is widely thought to influence deglacial CO2 rise and climate change; here we suggest that deep water formation in the North Pacific may also play an important role. We present paired radiocarbon and boron isotope data from foraminifera from sediment core MD02-2489 at 3640m in the North East Pacific. These show a pronounced excursion during Heinrich Stadial 1, with benthic-planktic radiocarbon offsets dropping to similar to 350 years, accompanied by a decrease in benthic delta B-11. We suggest that this is driven by the onset of deep convection in the North Pacific, which mixes young shallow waters to depth, old deep waters to the surface, and low-pH water from intermediate depths into the deep ocean. This deep water formation event was likely driven by an increase in surface salinity, due to subdued atmospheric/monsoonal freshwater flux during Heinrich Stadial 1. The ability of North Pacific Deep Water (NPDW) formation to explain the excursions seen in our data is demonstrated in a series of experiments with an intermediate complexity Earth system model. These experiments also show that breakdown of stratification in the North Pacific leads to a rapid similar to 30 ppm increase in atmospheric CO2, along with decreases in atmospheric delta C-13 and Delta C-14, consistent with observations of the early deglaciation. Our inference of deep water formation is based mainly on results from a single sediment core, and our boron isotope data are unavoidably sparse in the key HS1 interval, so this hypothesis merits further testing. However, we note that there is independent support for breakdown of stratification in shallower waters during this period, including a minimum in delta N-15, younging in intermediate water C-14, and regional warming. We also re-evaluate deglacial changes in North Pacific productivity and carbonate preservation in light of our new data and suggest that the regional pulse of export production observed during the Bolling-Allerod is ... |
format |
Article in Journal/Newspaper |
author |
Rae, James W. B. Sarnthein, Michael Foster, Gavin L. Ridgwell, Andy Grootes, Pieter M. Elliott, Tim |
author_facet |
Rae, James W. B. Sarnthein, Michael Foster, Gavin L. Ridgwell, Andy Grootes, Pieter M. Elliott, Tim |
author_sort |
Rae, James W. B. |
title |
Deep water formation in the North Pacific and deglacial CO2 rise |
title_short |
Deep water formation in the North Pacific and deglacial CO2 rise |
title_full |
Deep water formation in the North Pacific and deglacial CO2 rise |
title_fullStr |
Deep water formation in the North Pacific and deglacial CO2 rise |
title_full_unstemmed |
Deep water formation in the North Pacific and deglacial CO2 rise |
title_sort |
deep water formation in the north pacific and deglacial co2 rise |
publishDate |
2014 |
url |
https://hdl.handle.net/1983/af90146b-ec53-4a7d-b53f-8fbb9a2ff0cb https://research-information.bris.ac.uk/en/publications/af90146b-ec53-4a7d-b53f-8fbb9a2ff0cb https://doi.org/10.1002/2013PA002570 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Rae , J W B , Sarnthein , M , Foster , G L , Ridgwell , A , Grootes , P M & Elliott , T 2014 , ' Deep water formation in the North Pacific and deglacial CO2 rise ' , Paleoceanography , vol. 29 , no. 6 , pp. 645-667 . https://doi.org/10.1002/2013PA002570 |
op_relation |
https://research-information.bris.ac.uk/en/publications/af90146b-ec53-4a7d-b53f-8fbb9a2ff0cb |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/2013PA002570 |
container_title |
Paleoceanography |
container_volume |
29 |
container_issue |
6 |
container_start_page |
645 |
op_container_end_page |
667 |
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1798851471052111872 |