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...
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ftcaltechauth:oai:authors.library.caltech.edu:1j6kp-jj310 2024-06-23T07:55:21+00:00 Deep water formation in the North Pacific and deglacial CO_2 rise Rae, James W. B. Sarnthein, Michael Foster, Gavin L. Ridgwell, Andy Grootes, Pieter M. Elliott, Tim 2014-06 https://doi.org/10.1002/2013PA002570 unknown Wiley https://doi.org/10.1002/2013PA002570 oai:authors.library.caltech.edu:1j6kp-jj310 eprintid:49813 resolverid:CaltechAUTHORS:20140918-101910842 info:eu-repo/semantics/openAccess Other Paleoceanography, 29(6), 645-667, (2014-06) radiocarbon boron isotopes North Pacific deglacial CO2 deep water formation atmospheric teleconnections info:eu-repo/semantics/article 2014 ftcaltechauth https://doi.org/10.1002/2013PA002570 2024-06-12T05:44:54Z 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 ... Article in Journal/Newspaper North Atlantic Southern Ocean Caltech Authors (California Institute of Technology) Pacific Southern Ocean Paleoceanography 29 6 645 667 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
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 W. B. Sarnthein, Michael Foster, Gavin L. Ridgwell, Andy Grootes, Pieter M. 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 ... |
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 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 |
publisher |
Wiley |
publishDate |
2014 |
url |
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 |
Paleoceanography, 29(6), 645-667, (2014-06) |
op_relation |
https://doi.org/10.1002/2013PA002570 oai:authors.library.caltech.edu:1j6kp-jj310 eprintid:49813 resolverid:CaltechAUTHORS:20140918-101910842 |
op_rights |
info:eu-repo/semantics/openAccess Other |
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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1802647917205389312 |