Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline

In the context of the atmospheric CO214C/C (?Catm14) changes since the last ice age, two episodes of sharp ?Catm14 decline have been related to either the venting of deeply sequestered low-14C CO2 through the Southern Ocean surface or the abrupt onset of North Atlantic Deep Water (NADW) formation. I...

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Published in:Earth and Planetary Science Letters
Main Authors: Hain, Mathis P., Sigman, Daniel M., Haug, Gerald H.
Format: Article in Journal/Newspaper
Language:English
Published: 2014
Subjects:
Southern Ocean
NADW
North Atlantic Deep Water
North Atlantic
Online Access:https://eprints.soton.ac.uk/364156/
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spelling ftsouthampton:oai:eprints.soton.ac.uk:364156 2023-08-27T04:10:35+02:00 Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline Hain, Mathis P. Sigman, Daniel M. Haug, Gerald H. 2014-05-15 https://eprints.soton.ac.uk/364156/ English eng Hain, Mathis P., Sigman, Daniel M. and Haug, Gerald H. (2014) Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline. Earth and Planetary Science Letters, 394, 198-208. (doi:10.1016/j.epsl.2014.03.020 <http://dx.doi.org/10.1016/j.epsl.2014.03.020>). Article PeerReviewed 2014 ftsouthampton https://doi.org/10.1016/j.epsl.2014.03.020 2023-08-03T22:20:34Z In the context of the atmospheric CO214C/C (?Catm14) changes since the last ice age, two episodes of sharp ?Catm14 decline have been related to either the venting of deeply sequestered low-14C CO2 through the Southern Ocean surface or the abrupt onset of North Atlantic Deep Water (NADW) formation. In model simulations using an improved reconstruction of 14C production, Atlantic circulation change and Southern Ocean CO2 release both contribute to the overall deglacial ?Catm14 decline, but only the onset of NADW can reproduce the sharp ?Catm14 declines. To fully simulate ?Catm14 data requires an additional process that immediately precedes the onsets of NADW. We hypothesize that these “early” ?Catm14 declines record the thickening of the ocean's thermocline in response to reconstructed transient shutdown of NADW and/or changes in the southern hemisphere westerly winds. Such thermocline thickening may have played a role in triggering the NADW onsets. Article in Journal/Newspaper NADW North Atlantic Deep Water North Atlantic Southern Ocean University of Southampton: e-Prints Soton Southern Ocean Earth and Planetary Science Letters 394 198 208
institution Open Polar
collection University of Southampton: e-Prints Soton
op_collection_id ftsouthampton
language English
description In the context of the atmospheric CO214C/C (?Catm14) changes since the last ice age, two episodes of sharp ?Catm14 decline have been related to either the venting of deeply sequestered low-14C CO2 through the Southern Ocean surface or the abrupt onset of North Atlantic Deep Water (NADW) formation. In model simulations using an improved reconstruction of 14C production, Atlantic circulation change and Southern Ocean CO2 release both contribute to the overall deglacial ?Catm14 decline, but only the onset of NADW can reproduce the sharp ?Catm14 declines. To fully simulate ?Catm14 data requires an additional process that immediately precedes the onsets of NADW. We hypothesize that these “early” ?Catm14 declines record the thickening of the ocean's thermocline in response to reconstructed transient shutdown of NADW and/or changes in the southern hemisphere westerly winds. Such thermocline thickening may have played a role in triggering the NADW onsets.
format Article in Journal/Newspaper
author Hain, Mathis P.
Sigman, Daniel M.
Haug, Gerald H.
spellingShingle Hain, Mathis P.
Sigman, Daniel M.
Haug, Gerald H.
Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline
author_facet Hain, Mathis P.
Sigman, Daniel M.
Haug, Gerald H.
author_sort Hain, Mathis P.
title Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline
title_short Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline
title_full Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline
title_fullStr Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline
title_full_unstemmed Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline
title_sort distinct roles of the southern ocean and north atlantic in the deglacial atmospheric radiocarbon decline
publishDate 2014
url https://eprints.soton.ac.uk/364156/
geographic Southern Ocean
geographic_facet Southern Ocean
genre NADW
North Atlantic Deep Water
North Atlantic
Southern Ocean
genre_facet NADW
North Atlantic Deep Water
North Atlantic
Southern Ocean
op_relation Hain, Mathis P., Sigman, Daniel M. and Haug, Gerald H. (2014) Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline. Earth and Planetary Science Letters, 394, 198-208. (doi:10.1016/j.epsl.2014.03.020 <http://dx.doi.org/10.1016/j.epsl.2014.03.020>).
op_doi https://doi.org/10.1016/j.epsl.2014.03.020
container_title Earth and Planetary Science Letters
container_volume 394
container_start_page 198
op_container_end_page 208
_version_ 1775352747059576832

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