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Published October 29, 2011 | Published
Journal Article Open

The influence of tropospheric biennial oscillation on mid-tropospheric CO_2


Mid-tropospheric CO_2 retrieved from the Atmospheric Infrared Sounder (AIRS) was used to investigate CO_2 interannual variability over the Indo-Pacific region. A signal with periodicity around two years was found for the AIRS mid-tropospheric CO_2 for the first time, which is related to the Tropospheric Biennial Oscillation (TBO) associated with the strength of the monsoon. During a strong (weak) monsoon year, the Western Walker Circulation is strong (weak), resulting in enhanced (diminished) CO_2 transport from the surface to the mid-troposphere. As a result, there are positive (negative) CO2 anomalies at mid-troposphere over the Indo-Pacific region. We simulated the influence of the TBO on the mid-tropospheric CO_2 over the Indo-Pacific region using the MOZART-2 model, and results were consistent with observations, although we found the TBO signal in the model CO_2 is to be smaller than that in the AIRS observations.

Additional Information

© 2011 American Geophysical Union. Received 15 August 2011; accepted 28 September 2011; published 29 October 2011. We specially acknowledge Alexander Ruzmaikin, Runlie Shia, Fai Li, and three anonymous reviewers, who gave helpful comments on this research. X. Jiang is supported by JPL grant G99694. Y. L. Yung is supported by JPL grant P765982 to the California Institute of Technology. The Editor thanks three anonymous reviewers for their assistance in evaluating this paper.

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Published - Wang2011p16252Geophys_Res_Lett.pdf


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