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Published January 2013 | Published
Journal Article Open

Influence of El Niño on Midtropospheric CO_2 from Atmospheric Infrared Sounder and Model


The authors investigate the influence of El Niño on midtropospheric CO_2 from the Atmospheric Infrared Sounder (AIRS) and the Model for Ozone and Related Chemical Tracers, version 2 (MOZART-2). AIRS midtropospheric CO_2 data are used to study the temporal and spatial variability of CO_2 in response to El Niño. CO_2 differences between the central and western Pacific Ocean correlate well with the Southern Oscillation index. To reveal the temporal and spatial variability of the El Niño signal in the AIRS midtropospheric CO_2, a multiple regression method is applied to the CO_2 data from September 2002 to February 2011. There is more (less) midtropospheric CO_2 in the central Pacific and less (more) midtropospheric CO_2 in the western Pacific during El Niño (La Niña) events. Similar results are seen in the MOZART-2 convolved midtropospheric CO_2, although the El Niño signal in the MOZART-2 is weaker than that in the AIRS data.

Additional Information

© 2013 American Meteorological Society. Manuscript received 19 October 2011, in final form 13 January 2012. We especially acknowledge Moustafa Chahine, Alexander Ruzmaikin, and Mimi Gerstell, who gave helpful suggestions on this research. XJ was supported by JPL Grant G99694. YLY was supported by the JPL OCO-2 project. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

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