Document Detail

Tropical mid-tropospheric CO2 variability driven by the Madden-Julian oscillation.
MedLine Citation:
PMID:  20978207     Owner:  NLM     Status:  MEDLINE    
Carbon dioxide (CO(2)) is the most important anthropogenic greenhouse gas in the present-day climate. Most of the community focuses on its long-term (decadal to centennial) behaviors that are relevant to climate change, but there are relatively few discussions of its higher-frequency forms of variability, and none regarding its subseasonal distribution. In this work, we report a large-scale intraseasonal variation in the Atmospheric Infrared Sounder CO(2) data in the global tropical region associated with the Madden-Julian oscillation (MJO). The peak-to-peak amplitude of the composite MJO modulation is ∼1 ppmv, with a standard error of the composite mean < 0.1 ppmv. The correlation structure between CO(2) and rainfall and vertical velocity indicate positive (negative) anomalies in CO(2) arise due to upward (downward) large-scale vertical motions in the lower troposphere associated with the MJO. These findings can help elucidate how faster processes can organize, transport, and mix CO(2) and provide a robustness test for coupled carbon-climate models.
King-Fai Li; Baijun Tian; Duane E Waliser; Yuk L Yung
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-10-26
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  107     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-10     Completed Date:  2010-12-30     Revised Date:  2011-07-28    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  19171-5     Citation Subset:  IM    
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
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MeSH Terms
Atmosphere / analysis*
Carbon Dioxide / analysis*
Greenhouse Effect
Tropical Climate*
Reg. No./Substance:
0/Gases; 124-38-9/Carbon Dioxide

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