Special Section on Advances in Infrared Remote Sensing and Instrumentation

Global variability of midtropospheric carbon dioxide as measured by the Atmospheric Infrared Sounder

[+] Author Affiliations
Thomas S. Pagano

California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California, 91109

Edward T. Olsen

California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California, 91109

Hai Nguyen

California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California, 91109

Alexander Ruzmaikin

California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California, 91109

Xun Jiang

University of Houston, Department of Earth and Atmospheric Sciences, 312 Science and Research 1, Houston, Texas, 77204

Lori Perkins

NASA Goddard Space Flight Center, Science Visualization Studios, Greenbelt, Maryland, 20771

J. Appl. Remote Sens. 8(1), 084984 (Jun 16, 2014). doi:10.1117/1.JRS.8.084984
History: Received December 19, 2013; Revised April 17, 2014; Accepted April 18, 2014
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Abstract.  The Atmospheric Infrared Sounder (AIRS) on the EOS Aqua spacecraft provides accurate and consistent measurements of midtropospheric carbon dioxide (CO2) with global monthly coverage. The data are widely used for studies of vertical transport of CO2 due to large-scale dynamics (e.g., ENSO, MJO, and the Walker Circulation). The purpose of this paper is to characterize the response of CO2 in the midtroposphere, at the altitudes where AIRS is most sensitive, to geophysical changes at the surface across the globe. Our findings confirm that surface factors, as well as weather and climate patterns, impact the global variability of midtropospheric CO2 as observed by AIRS. Despite a phase lag and a reduction in the seasonal amplitude observed in AIRS CO2 relative to surface CO2 measurements in the Northern Hemisphere, a significant correlation is observed between regional variability of CO2 from AIRS and Moderate Resolution Imaging Spectroradiometer (MODIS)-derived Gross Primary Productivity at the surface, primarily in the high-latitude boreal forests during the peak of the growing season (July). A video of global AIRS CO2 and MODIS vegetation index clearly shows the seasonal drawdown of CO2 from the midtroposphere over highly vegetated areas in the northern latitudes. In the Southern Hemisphere, we see higher amplitude in the seasonal cycle, with the phase leading that of the surface. Both are indicative of interhemispheric transport.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Thomas S. Pagano ; Edward T. Olsen ; Hai Nguyen ; Alexander Ruzmaikin ; Xun Jiang, et al.
"Global variability of midtropospheric carbon dioxide as measured by the Atmospheric Infrared Sounder", J. Appl. Remote Sens. 8(1), 084984 (Jun 16, 2014). ; http://dx.doi.org/10.1117/1.JRS.8.084984


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