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Proceedings Paper

Measurement of atmospheric carbon dioxide column from space using reflected sunlight
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Paper Abstract

A series of sensitivity studies is carried out to explore the feasibility of space-based global carbon dioxide (CO2) measurements for global and regional carbon cycle studies. The detection method uses absorption of reflected sunlight in the CO2 vibration-rotation band at 1.58 μm. The sensitivities of the detected radiances are calculated using a line-by-line model implemented with the DISORT model to include atmospheric scattering. The results indicate that (a) the small (~1%) changes in CO2 near the Earth’s surface are detectable in this CO2 band provided adequate sensor signal-to-noise ratio and spectral resolution are achievable; (b) the modification of sunlight path length by scattering of aerosols and cirrus clouds could lead to large systematic errors in the retrieval; therefore, ancillary aerosol/cirrus cloud data are important to reduce retrieval errors; (c) the atmospheric path length, over which the CO2 absorption occurs, must be known in order to correctly interpret horizontal gradients of total column CO2; thus an additional sensor for surface pressure measurement needs to be attached for a complete measurement package; (d) CO2 retrieval requires good knowledge of the atmospheric temperature profile, e.g. approximately 1-K RMS error in layer temperature. Several candidate technologies are available to potentially meet these requirements.

Paper Details

Date Published: 16 February 2004
PDF: 11 pages
Proc. SPIE 5235, Remote Sensing of Clouds and the Atmosphere VIII, (16 February 2004); doi: 10.1117/12.511323
Show Author Affiliations
Jianping Mao, Science Systems and Applications, Inc. (United States)
Stephan Randolph Kawa, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 5235:
Remote Sensing of Clouds and the Atmosphere VIII
Klaus P. Schaefer; Adolfo Comeron; Michel R. Carleer; Richard H. Picard, Editor(s)

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