Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds
Tree ring Delta14C data indicate that atmospheric Delta14C varied on multi-decadal to centennial timescales, in both hemispheres, over the period between AD950 and 1830. The Northern and Southern Hemispheric Delta14C records display similar variability, but from the data alone is it not clear whethe...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , , , , , , , , , , |
Other Authors: | , , , , |
Format: | Other Non-Article Part of Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2011
|
Subjects: | |
Online Access: | http://elib.dlr.de/73174/ http://elib.dlr.de/73174/1/Rodgers_et_al._CP_2011.pdf http://www.clim-past.net/7/1123/2011/cp-7-1123-2011.html |
id |
ftdlr:oai:elib.dlr.de:73174 |
---|---|
record_format |
openpolar |
spelling |
ftdlr:oai:elib.dlr.de:73174 2023-05-15T18:24:02+02:00 Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds Rodgers, Keith B. Mikaloff-Fletcher, Sarah E. Bianchi, Daniele Beaulieu, Claudie Galbraith, Eric D. Gnanadesikan, Anand Hogg, Alan G. Iudicone, Daniele Lintner, Benjamin R. Naegler, Tobias Reimer, Paula J. Sarmiento, Jorge L. Slater, Richard D. Wolf, Eric Barbante, Carlo Goosse, Hugues Kiefer, Thorsten Rousseau, Denis-Didier 2011-10-26 application/pdf http://elib.dlr.de/73174/ http://elib.dlr.de/73174/1/Rodgers_et_al._CP_2011.pdf http://www.clim-past.net/7/1123/2011/cp-7-1123-2011.html en eng Copernicus Publications http://elib.dlr.de/73174/1/Rodgers_et_al._CP_2011.pdf Rodgers, Keith B. und Mikaloff-Fletcher, Sarah E. und Bianchi, Daniele und Beaulieu, Claudie und Galbraith, Eric D. und Gnanadesikan, Anand und Hogg, Alan G. und Iudicone, Daniele und Lintner, Benjamin R. und Naegler, Tobias und Reimer, Paula J. und Sarmiento, Jorge L. und Slater, Richard D. (2011) Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds. Climate of the Past (7), Seiten 1123-1138. Copernicus Publications. DOI:10.5194/cp-7-1123-2011. Systemanalyse und Technikbewertung Zeitschriftenbeitrag PeerReviewed 2011 ftdlr https://doi.org/10.5194/cp-7-1123-2011 2016-03-28T20:55:41Z Tree ring Delta14C data indicate that atmospheric Delta14C varied on multi-decadal to centennial timescales, in both hemispheres, over the period between AD950 and 1830. The Northern and Southern Hemispheric Delta14C records display similar variability, but from the data alone is it not clear whether these variations are driven by the production of 14C in the stratosphere or by perturbations to exchanges between carbon reservoirs. As the sea-air flux of 14CO2 has a clear maximum in the open ocean regions of the Southern Ocean, relatively modest perturbations to the winds over this region drive significant perturbations to the interhemispheric gradient. In this study, model simulations are used to show that Southern Ocean winds are likely a main driver of the observed variability in the interhemispheric gradient over AD950–1830, and further, that this variability may be larger than the Southern Ocean wind trends that have been reported for recent decades (notably 1980–2004). This interpretation also implies that there may have been a significant weakening of the winds over the Southern Ocean within a few decades of AD1375, associated with the transition between the Medieval Climate Anomaly. (krodgers@princeton.edu) and the Little Ice Age. The driving forces that could have produced such a shift in the winds at the Medieval Climate Anomaly to Little Ice Age transition remain unknown. Our process-focused suite of perturbation experiments with models raises the possibility that the current generation of coupled climate and earth system models may underestimate the natural background multi-decadal- to centennial-timescale variations in the winds over the Southern Ocean. Other Non-Article Part of Journal/Newspaper Southern Ocean German Aerospace Center: elib - DLR electronic library Southern Ocean Climate of the Past 7 4 1123 1138 |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
English |
topic |
Systemanalyse und Technikbewertung |
spellingShingle |
Systemanalyse und Technikbewertung Rodgers, Keith B. Mikaloff-Fletcher, Sarah E. Bianchi, Daniele Beaulieu, Claudie Galbraith, Eric D. Gnanadesikan, Anand Hogg, Alan G. Iudicone, Daniele Lintner, Benjamin R. Naegler, Tobias Reimer, Paula J. Sarmiento, Jorge L. Slater, Richard D. Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds |
topic_facet |
Systemanalyse und Technikbewertung |
description |
Tree ring Delta14C data indicate that atmospheric Delta14C varied on multi-decadal to centennial timescales, in both hemispheres, over the period between AD950 and 1830. The Northern and Southern Hemispheric Delta14C records display similar variability, but from the data alone is it not clear whether these variations are driven by the production of 14C in the stratosphere or by perturbations to exchanges between carbon reservoirs. As the sea-air flux of 14CO2 has a clear maximum in the open ocean regions of the Southern Ocean, relatively modest perturbations to the winds over this region drive significant perturbations to the interhemispheric gradient. In this study, model simulations are used to show that Southern Ocean winds are likely a main driver of the observed variability in the interhemispheric gradient over AD950–1830, and further, that this variability may be larger than the Southern Ocean wind trends that have been reported for recent decades (notably 1980–2004). This interpretation also implies that there may have been a significant weakening of the winds over the Southern Ocean within a few decades of AD1375, associated with the transition between the Medieval Climate Anomaly. (krodgers@princeton.edu) and the Little Ice Age. The driving forces that could have produced such a shift in the winds at the Medieval Climate Anomaly to Little Ice Age transition remain unknown. Our process-focused suite of perturbation experiments with models raises the possibility that the current generation of coupled climate and earth system models may underestimate the natural background multi-decadal- to centennial-timescale variations in the winds over the Southern Ocean. |
author2 |
Wolf, Eric Barbante, Carlo Goosse, Hugues Kiefer, Thorsten Rousseau, Denis-Didier |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Rodgers, Keith B. Mikaloff-Fletcher, Sarah E. Bianchi, Daniele Beaulieu, Claudie Galbraith, Eric D. Gnanadesikan, Anand Hogg, Alan G. Iudicone, Daniele Lintner, Benjamin R. Naegler, Tobias Reimer, Paula J. Sarmiento, Jorge L. Slater, Richard D. |
author_facet |
Rodgers, Keith B. Mikaloff-Fletcher, Sarah E. Bianchi, Daniele Beaulieu, Claudie Galbraith, Eric D. Gnanadesikan, Anand Hogg, Alan G. Iudicone, Daniele Lintner, Benjamin R. Naegler, Tobias Reimer, Paula J. Sarmiento, Jorge L. Slater, Richard D. |
author_sort |
Rodgers, Keith B. |
title |
Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds |
title_short |
Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds |
title_full |
Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds |
title_fullStr |
Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds |
title_full_unstemmed |
Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds |
title_sort |
interhemispheric gradient of atmospheric radiocarbon reveals natural variability of southern ocean winds |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
http://elib.dlr.de/73174/ http://elib.dlr.de/73174/1/Rodgers_et_al._CP_2011.pdf http://www.clim-past.net/7/1123/2011/cp-7-1123-2011.html |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://elib.dlr.de/73174/1/Rodgers_et_al._CP_2011.pdf Rodgers, Keith B. und Mikaloff-Fletcher, Sarah E. und Bianchi, Daniele und Beaulieu, Claudie und Galbraith, Eric D. und Gnanadesikan, Anand und Hogg, Alan G. und Iudicone, Daniele und Lintner, Benjamin R. und Naegler, Tobias und Reimer, Paula J. und Sarmiento, Jorge L. und Slater, Richard D. (2011) Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds. Climate of the Past (7), Seiten 1123-1138. Copernicus Publications. DOI:10.5194/cp-7-1123-2011. |
op_doi |
https://doi.org/10.5194/cp-7-1123-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
4 |
container_start_page |
1123 |
op_container_end_page |
1138 |
_version_ |
1766204308904214528 |