Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates
We examine ship-based observations of atmospheric O-2 and CO2 in the southern Pacific Ocean made during two voyages: in February 2003 and in April 2004. We found, for the Austral late summer to autumn, evidence of a maximum in Atmospheric Potential Oxygen (APO) (an atmospheric tracer that is conserv...
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American Geophysical Union
2008
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ftnerc:oai:nora.nerc.ac.uk:11639 2023-05-15T13:45:10+02:00 Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates Thompson, Rona L. Gloor, Manuel Manning, Andrew C. Lowe, David C. Rödenbeck, Christian Le Quéré, Corinne 2008-06 text http://nora.nerc.ac.uk/id/eprint/11639/ https://nora.nerc.ac.uk/id/eprint/11639/1/2007JG000554.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2007JG000554 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/11639/1/2007JG000554.pdf Thompson, Rona L.; Gloor, Manuel; Manning, Andrew C.; Lowe, David C.; Rödenbeck, Christian; Le Quéré, Corinne. 2008 Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates. Journal of Geophysical Research, 113 (G2), G02025. 13, pp. https://doi.org/10.1029/2007JG000554 <https://doi.org/10.1029/2007JG000554> Marine Sciences Chemistry Atmospheric Sciences Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.1029/2007JG000554 2023-02-04T19:27:30Z We examine ship-based observations of atmospheric O-2 and CO2 in the southern Pacific Ocean made during two voyages: in February 2003 and in April 2004. We found, for the Austral late summer to autumn, evidence of a maximum in Atmospheric Potential Oxygen (APO) (an atmospheric tracer that is conservative with respect to terrestrial biological activity, APO approximate to O-2 + CO2) centered around 50 degrees S owing to biologically driven O-2 outgassing (associated with strong productivity in the Sub-Tropical Convergence Zone) and evidence in the February voyage of a decreasing APO trend from 57 degrees S south toward the Antarctic coast. The observed APO variability appears to be primarily determined by the interplay between atmospheric transport and the spatial distribution of O-2 air-sea flux resulting from regional differences in biological production. Comparisons of these observations with APO derived from coupling the TM3 atmospheric transport model with flux estimates from (1) the PISCES-T ocean biogeochemistry model, and (2) O-2 and CO2 climatologies, show that both PISCES-T and the climatology reproduce the observed gradient and curvature of APO but underestimate the magnitude of the observed APO maximum in the mid southern latitudes. Although the temporal limitation of our data does not permit us to calculate the annual mean APO gradient, the results support previous model predictions of a decreasing APO trend from the mid to high southern latitudes. Article in Journal/Newspaper Antarc* Antarctic Natural Environment Research Council: NERC Open Research Archive Antarctic Austral Pacific The Antarctic Journal of Geophysical Research: Biogeosciences 113 G2 n/a n/a |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Marine Sciences Chemistry Atmospheric Sciences |
spellingShingle |
Marine Sciences Chemistry Atmospheric Sciences Thompson, Rona L. Gloor, Manuel Manning, Andrew C. Lowe, David C. Rödenbeck, Christian Le Quéré, Corinne Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates |
topic_facet |
Marine Sciences Chemistry Atmospheric Sciences |
description |
We examine ship-based observations of atmospheric O-2 and CO2 in the southern Pacific Ocean made during two voyages: in February 2003 and in April 2004. We found, for the Austral late summer to autumn, evidence of a maximum in Atmospheric Potential Oxygen (APO) (an atmospheric tracer that is conservative with respect to terrestrial biological activity, APO approximate to O-2 + CO2) centered around 50 degrees S owing to biologically driven O-2 outgassing (associated with strong productivity in the Sub-Tropical Convergence Zone) and evidence in the February voyage of a decreasing APO trend from 57 degrees S south toward the Antarctic coast. The observed APO variability appears to be primarily determined by the interplay between atmospheric transport and the spatial distribution of O-2 air-sea flux resulting from regional differences in biological production. Comparisons of these observations with APO derived from coupling the TM3 atmospheric transport model with flux estimates from (1) the PISCES-T ocean biogeochemistry model, and (2) O-2 and CO2 climatologies, show that both PISCES-T and the climatology reproduce the observed gradient and curvature of APO but underestimate the magnitude of the observed APO maximum in the mid southern latitudes. Although the temporal limitation of our data does not permit us to calculate the annual mean APO gradient, the results support previous model predictions of a decreasing APO trend from the mid to high southern latitudes. |
format |
Article in Journal/Newspaper |
author |
Thompson, Rona L. Gloor, Manuel Manning, Andrew C. Lowe, David C. Rödenbeck, Christian Le Quéré, Corinne |
author_facet |
Thompson, Rona L. Gloor, Manuel Manning, Andrew C. Lowe, David C. Rödenbeck, Christian Le Quéré, Corinne |
author_sort |
Thompson, Rona L. |
title |
Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates |
title_short |
Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates |
title_full |
Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates |
title_fullStr |
Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates |
title_full_unstemmed |
Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates |
title_sort |
variability in atmospheric o2 and co2 concentrations in the southern pacific ocean and their comparison with model estimates |
publisher |
American Geophysical Union |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/11639/ https://nora.nerc.ac.uk/id/eprint/11639/1/2007JG000554.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2007JG000554 |
geographic |
Antarctic Austral Pacific The Antarctic |
geographic_facet |
Antarctic Austral Pacific The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://nora.nerc.ac.uk/id/eprint/11639/1/2007JG000554.pdf Thompson, Rona L.; Gloor, Manuel; Manning, Andrew C.; Lowe, David C.; Rödenbeck, Christian; Le Quéré, Corinne. 2008 Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates. Journal of Geophysical Research, 113 (G2), G02025. 13, pp. https://doi.org/10.1029/2007JG000554 <https://doi.org/10.1029/2007JG000554> |
op_doi |
https://doi.org/10.1029/2007JG000554 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
113 |
container_issue |
G2 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766214683555004416 |