Saturation of the Southern Ocean CO 2 Sink Due to Recent Climate Change

Author:

Le Quéré Corinne12345,Rödenbeck Christian12345,Buitenhuis Erik T.12345,Conway Thomas J.12345,Langenfelds Ray12345,Gomez Antony12345,Labuschagne Casper12345,Ramonet Michel12345,Nakazawa Takakiyo12345,Metzl Nicolas12345,Gillett Nathan12345,Heimann Martin12345

Affiliation:

1. Max Planck Institut für Biogeochemie, Postfach 100164, D-07701 Jena, Germany.

2. School of Environmental Sciences University of East Anglia, Norwich NR4 7TJ, UK.

3. British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK.

4. National Oceanic and Atmospheric Administration, Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, USA.

5. Commonwealth Scientific and Industrial Research Organisation, Marine and Atmospheric Research, PMB1 Aspendale, Victoria 3195, Australia.

Abstract

Based on observed atmospheric carbon dioxide (CO 2 ) concentration and an inverse method, we estimate that the Southern Ocean sink of CO 2 has weakened between 1981 and 2004 by 0.08 petagrams of carbon per year per decade relative to the trend expected from the large increase in atmospheric CO 2 . We attribute this weakening to the observed increase in Southern Ocean winds resulting from human activities, which is projected to continue in the future. Consequences include a reduction of the efficiency of the Southern Ocean sink of CO 2 in the short term (about 25 years) and possibly a higher level of stabilization of atmospheric CO 2 on a multicentury time scale.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference29 articles.

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2. Influence of El Niño on the equatorial Pacific contribution to atmospheric CO2 accumulation

3. N. Gruber, C. D. Keeling, N. R. Bates, Nature298, 2374 (2002).

4. Climate-driven changes to the atmospheric CO2 sink in the subtropical North Pacific Ocean

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