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The influence of tropospheric biennial oscillation on mid-tropospheric CO_2

Wang, Jingqian and Jiang, Xun and Chahine, Moustafa T. and Liang, Mao-Chang and Olsen, Edward T. and Chen, Luke L. and Licata, Stephen J. and Pagano, Thomas S. and Yung, Yuk L. (2011) The influence of tropospheric biennial oscillation on mid-tropospheric CO_2. Geophysical Research Letters, 38 . L20805. ISSN 0094-8276.

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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.

Item Type:Article
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URLURL TypeDescription
Jiang, Xun0000-0001-8932-3807
Liang, Mao-Chang0000-0002-5294-9344
Yung, Yuk L.0000-0002-4263-2562
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.
Funding AgencyGrant Number
Subject Keywords:CO2 variability; monsoon
Record Number:CaltechAUTHORS:20111116-105808390
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Official Citation:Wang, J., X. Jiang, M. T. Chahine, M.-C. Liang, E. T. Olsen, L. L. Chen, S. J. Licata, T. S. Pagano, and Y. L. Yung (2011), The influence of tropospheric biennial oscillation on mid-tropospheric CO2, Geophys. Res. Lett., 38, L20805, doi:10.1029/2011GL049288.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27805
Deposited By: Jason Perez
Deposited On:16 Nov 2011 23:57
Last Modified:09 Mar 2020 13:19

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