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Proceedings Paper

Global and regional seasonal variability of mid-tropospheric CO2 as measured by the Atmospheric Infrared Sounder (AIRS)
Author(s): Thomas S. Pagano; Edward T. Olsen; Hai Nguyen
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Paper Abstract

The Atmospheric Infrared Sounder (AIRS) is a hyperspectral infrared instrument on the Earth Observing System (EOS) Aqua Spacecraft, launched on May 4, 2002 into a near polar sun-synchronous orbit. AIRS has 2378 infrared channels ranging from 3.7 μm to 15.4 μm and a 13.5 km footprint at nadir. AIRS, in conjunction with the Advanced Microwave Sounding Unit (AMSU), produces temperature profiles with 1K/km accuracy on a global scale, as well as water vapor profiles and trace gas amounts for CO2, CO, SO2, O3 and CH4. AIRS CO2 climatologies have been shown to be useful for identifying anomalies associated with geophysical events such as El Niño-Southern Oscillation or Madden–Julian oscillation. In this study, monthly representations of mid-tropospheric CO2 are constructed from 10 years of AIRS Version 5 monthly Level 3 data. We compare the AIRS mid-tropospheric CO2 representations to ground-based measurements from the Scripps and National Oceanic and Atmospheric Administration Climate Modeling and Diagnostics Laboratory (NOAA CMDL) ground networks to better understand the phase lag of the CO2 seasonal cycle between the surface and middle troposphere. Results show only a small phase lag in the tropics that grows to approximately two months in the northern latitudes.

Paper Details

Date Published: 15 October 2012
PDF: 5 pages
Proc. SPIE 8515, Imaging Spectrometry XVII, 851507 (15 October 2012); doi: 10.1117/12.929197
Show Author Affiliations
Thomas S. Pagano, Jet Propulsion Lab. (United States)
Edward T. Olsen, Jet Propulsion Lab. (United States)
Hai Nguyen, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 8515:
Imaging Spectrometry XVII
Sylvia S. Shen; Paul E. Lewis, Editor(s)

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