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The influence of tropospheric biennial oscillation on mid‐tropospheric CO 2
Author(s) -
Wang Jingqian,
Jiang Xun,
Chahine Moustafa T.,
Liang MaoChang,
Olsen Edward T.,
Chen Luke L.,
Licata Stephen J.,
Pagano Thomas S.,
Yung Yuk L.
Publication year - 2011
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2011gl049288
Subject(s) - troposphere , atmospheric infrared sounder , climatology , atmospheric sciences , environmental science , monsoon , atmosphere (unit) , geology , meteorology , geography
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) CO 2 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.