Deep water formation in the North Pacific and deglacial CO 2 rise
Deep water formation in the North Atlantic and Southern Ocean is widely thought to influence deglacial CO 2 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...
Published in: | Paleoceanography |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2014
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/deep-water-formation-in-the-north-pacific-and-deglacial-co2-rise(09c4a65f-0fd4-4b70-ad7a-206cd4731436).html https://doi.org/10.1002/2013PA002570 https://research-repository.st-andrews.ac.uk/bitstream/10023/4947/1/Rae_2014_Paleoceanography_DeepWater.pdf |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/09c4a65f-0fd4-4b70-ad7a-206cd4731436 2023-05-15T17:36:48+02:00 Deep water formation in the North Pacific and deglacial CO 2 rise Rae, James William Buchanan Sarnthein, Michael Foster, Gavin Ridgwell, Andy Grootes, Pieter Elliott, Tim 2014-07-14 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/deep-water-formation-in-the-north-pacific-and-deglacial-co2-rise(09c4a65f-0fd4-4b70-ad7a-206cd4731436).html https://doi.org/10.1002/2013PA002570 https://research-repository.st-andrews.ac.uk/bitstream/10023/4947/1/Rae_2014_Paleoceanography_DeepWater.pdf eng eng info:eu-repo/semantics/openAccess Rae , J W B , Sarnthein , M , Foster , G , Ridgwell , A , Grootes , P & Elliott , T 2014 , ' Deep water formation in the North Pacific and deglacial CO 2 rise ' , Paleoceanography , vol. 29 , no. 6 , pp. 645-667 . https://doi.org/10.1002/2013PA002570 Radiocarbon Boron isotopes North Pacific Deglacial CO2 Deep water formation Atmospheric teleconnections article 2014 ftunstandrewcris https://doi.org/10.1002/2013PA002570 2022-06-02T07:42:43Z Deep water formation in the North Atlantic and Southern Ocean is widely thought to influence deglacial CO 2 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 3640 m in the North East Pacific. These show a pronounced excursion during Heinrich Stadial 1, with benthic‐planktic radiocarbon offsets dropping to ~350 years, accompanied by a decrease in benthic δ 11 B. 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 ~30 ppm increase in atmospheric CO 2 , along with decreases in atmospheric δ 13 C and Δ 14 C, 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 δ 15 N, younging in intermediate water 14 C, 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 Bølling‐Allerød is promoted by relatively stratified ... Article in Journal/Newspaper North Atlantic Southern Ocean University of St Andrews: Research Portal Pacific Southern Ocean Paleoceanography 29 6 645 667 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Radiocarbon Boron isotopes North Pacific Deglacial CO2 Deep water formation Atmospheric teleconnections |
spellingShingle |
Radiocarbon Boron isotopes North Pacific Deglacial CO2 Deep water formation Atmospheric teleconnections Rae, James William Buchanan Sarnthein, Michael Foster, Gavin Ridgwell, Andy Grootes, Pieter Elliott, Tim Deep water formation in the North Pacific and deglacial CO 2 rise |
topic_facet |
Radiocarbon Boron isotopes North Pacific Deglacial CO2 Deep water formation Atmospheric teleconnections |
description |
Deep water formation in the North Atlantic and Southern Ocean is widely thought to influence deglacial CO 2 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 3640 m in the North East Pacific. These show a pronounced excursion during Heinrich Stadial 1, with benthic‐planktic radiocarbon offsets dropping to ~350 years, accompanied by a decrease in benthic δ 11 B. 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 ~30 ppm increase in atmospheric CO 2 , along with decreases in atmospheric δ 13 C and Δ 14 C, 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 δ 15 N, younging in intermediate water 14 C, 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 Bølling‐Allerød is promoted by relatively stratified ... |
format |
Article in Journal/Newspaper |
author |
Rae, James William Buchanan Sarnthein, Michael Foster, Gavin Ridgwell, Andy Grootes, Pieter Elliott, Tim |
author_facet |
Rae, James William Buchanan Sarnthein, Michael Foster, Gavin Ridgwell, Andy Grootes, Pieter Elliott, Tim |
author_sort |
Rae, James William Buchanan |
title |
Deep water formation in the North Pacific and deglacial CO 2 rise |
title_short |
Deep water formation in the North Pacific and deglacial CO 2 rise |
title_full |
Deep water formation in the North Pacific and deglacial CO 2 rise |
title_fullStr |
Deep water formation in the North Pacific and deglacial CO 2 rise |
title_full_unstemmed |
Deep water formation in the North Pacific and deglacial CO 2 rise |
title_sort |
deep water formation in the north pacific and deglacial co 2 rise |
publishDate |
2014 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/deep-water-formation-in-the-north-pacific-and-deglacial-co2-rise(09c4a65f-0fd4-4b70-ad7a-206cd4731436).html https://doi.org/10.1002/2013PA002570 https://research-repository.st-andrews.ac.uk/bitstream/10023/4947/1/Rae_2014_Paleoceanography_DeepWater.pdf |
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 , Ridgwell , A , Grootes , P & Elliott , T 2014 , ' Deep water formation in the North Pacific and deglacial CO 2 rise ' , Paleoceanography , vol. 29 , no. 6 , pp. 645-667 . https://doi.org/10.1002/2013PA002570 |
op_rights |
info:eu-repo/semantics/openAccess |
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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1766136392900935680 |