Multidecadal variations in Southern Hemisphere atmospheric 14 C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO 2 anomaly
Northern Hemisphere-wide cooling during the Little Ice Age (LIA; 1650-1775 Common Era, C.E.) was associated with a ~5 ppmv decrease in atmospheric carbon dioxide. Changes in terrestrial and ocean carbon reservoirs have been postulated as possible drivers of this relatively large shift in atmospheric...
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Language: | English |
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ftsouthampton:oai:eprints.soton.ac.uk:476055 2023-07-30T04:01:48+02:00 Multidecadal variations in Southern Hemisphere atmospheric 14 C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO 2 anomaly Turney, Chris S.M. Palmer, Jonathan Hogg, Alan Fogwill, Christopher J. Jones, Richard T. Bronk Ramsey, Christopher Fenwick, Pavla Grierson, Pauline Wilmshurst, Janet O'Donnell, Alison Thomas, Zoë A. Lipson, Mathew 2016-02 https://eprints.soton.ac.uk/476055/ English eng Turney, Chris S.M., Palmer, Jonathan, Hogg, Alan, Jones, Richard T. and Thomas, Zoë A. , et al. (2016) Multidecadal variations in Southern Hemisphere atmospheric 14C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO2 anomaly. Global Biogeochemical Cycles, 30 (2), 211-218. (doi:10.1002/2015GB005257 <http://dx.doi.org/10.1002/2015GB005257>). Article PeerReviewed 2016 ftsouthampton https://doi.org/10.1002/2015GB005257 2023-07-09T22:59:13Z Northern Hemisphere-wide cooling during the Little Ice Age (LIA; 1650-1775 Common Era, C.E.) was associated with a ~5 ppmv decrease in atmospheric carbon dioxide. Changes in terrestrial and ocean carbon reservoirs have been postulated as possible drivers of this relatively large shift in atmospheric CO2, potentially providing insights into the mechanisms and sensitivity of the global carbon cycle. Here we report decadally resolved radiocarbon (14C) levels in a network of tree-ring series spanning 1700-1950 C.E. located along the northern boundary of, and within, the Southern Ocean. We observe regional dilutions in atmospheric radiocarbon (relative to the Northern Hemisphere) associated with upwelling of 14CO2-depleted abyssal waters. We find the interhemispheric 14C offset approaches zero during increasing global atmospheric CO2 at the end of the LIA, with reduced ventilation in the Southern Ocean and a Northern Hemisphere source of old carbon (most probably originating from deep Arctic peat layers). The coincidence of the atmospheric CO2 increase and reduction in the interhemispheric 14C offset imply a common climate control. Possible mechanisms of synchronous change in the high latitudes of both hemispheres are discussed. Article in Journal/Newspaper Arctic Southern Ocean University of Southampton: e-Prints Soton Arctic Southern Ocean Global Biogeochemical Cycles 30 2 211 218 |
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Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Northern Hemisphere-wide cooling during the Little Ice Age (LIA; 1650-1775 Common Era, C.E.) was associated with a ~5 ppmv decrease in atmospheric carbon dioxide. Changes in terrestrial and ocean carbon reservoirs have been postulated as possible drivers of this relatively large shift in atmospheric CO2, potentially providing insights into the mechanisms and sensitivity of the global carbon cycle. Here we report decadally resolved radiocarbon (14C) levels in a network of tree-ring series spanning 1700-1950 C.E. located along the northern boundary of, and within, the Southern Ocean. We observe regional dilutions in atmospheric radiocarbon (relative to the Northern Hemisphere) associated with upwelling of 14CO2-depleted abyssal waters. We find the interhemispheric 14C offset approaches zero during increasing global atmospheric CO2 at the end of the LIA, with reduced ventilation in the Southern Ocean and a Northern Hemisphere source of old carbon (most probably originating from deep Arctic peat layers). The coincidence of the atmospheric CO2 increase and reduction in the interhemispheric 14C offset imply a common climate control. Possible mechanisms of synchronous change in the high latitudes of both hemispheres are discussed. |
format |
Article in Journal/Newspaper |
author |
Turney, Chris S.M. Palmer, Jonathan Hogg, Alan Fogwill, Christopher J. Jones, Richard T. Bronk Ramsey, Christopher Fenwick, Pavla Grierson, Pauline Wilmshurst, Janet O'Donnell, Alison Thomas, Zoë A. Lipson, Mathew |
spellingShingle |
Turney, Chris S.M. Palmer, Jonathan Hogg, Alan Fogwill, Christopher J. Jones, Richard T. Bronk Ramsey, Christopher Fenwick, Pavla Grierson, Pauline Wilmshurst, Janet O'Donnell, Alison Thomas, Zoë A. Lipson, Mathew Multidecadal variations in Southern Hemisphere atmospheric 14 C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO 2 anomaly |
author_facet |
Turney, Chris S.M. Palmer, Jonathan Hogg, Alan Fogwill, Christopher J. Jones, Richard T. Bronk Ramsey, Christopher Fenwick, Pavla Grierson, Pauline Wilmshurst, Janet O'Donnell, Alison Thomas, Zoë A. Lipson, Mathew |
author_sort |
Turney, Chris S.M. |
title |
Multidecadal variations in Southern Hemisphere atmospheric 14 C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO 2 anomaly |
title_short |
Multidecadal variations in Southern Hemisphere atmospheric 14 C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO 2 anomaly |
title_full |
Multidecadal variations in Southern Hemisphere atmospheric 14 C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO 2 anomaly |
title_fullStr |
Multidecadal variations in Southern Hemisphere atmospheric 14 C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO 2 anomaly |
title_full_unstemmed |
Multidecadal variations in Southern Hemisphere atmospheric 14 C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO 2 anomaly |
title_sort |
multidecadal variations in southern hemisphere atmospheric 14 c: evidence against a southern ocean sink at the end of the little ice age co 2 anomaly |
publishDate |
2016 |
url |
https://eprints.soton.ac.uk/476055/ |
geographic |
Arctic Southern Ocean |
geographic_facet |
Arctic Southern Ocean |
genre |
Arctic Southern Ocean |
genre_facet |
Arctic Southern Ocean |
op_relation |
Turney, Chris S.M., Palmer, Jonathan, Hogg, Alan, Jones, Richard T. and Thomas, Zoë A. , et al. (2016) Multidecadal variations in Southern Hemisphere atmospheric 14C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO2 anomaly. Global Biogeochemical Cycles, 30 (2), 211-218. (doi:10.1002/2015GB005257 <http://dx.doi.org/10.1002/2015GB005257>). |
op_doi |
https://doi.org/10.1002/2015GB005257 |
container_title |
Global Biogeochemical Cycles |
container_volume |
30 |
container_issue |
2 |
container_start_page |
211 |
op_container_end_page |
218 |
_version_ |
1772812555383734272 |