Abstract

Space-based active sensing of CO2 concentration is a very promising technique for the derivation of CO2 surface fluxes. There is a need for accurate spectroscopic parameters to enable accurate space-based measurements to address global climatic issues. New spectroscopic measurements using laser diode absorption spectroscopy are presented for the preselected R30 CO2 absorption line ((2001)III(000) band) and four others. The line strength, air-broadening halfwidth, and its temperature dependence have been investigated. The results exhibit significant improvement for the R30 CO2 absorption line: 0.4% on the line strength, 0.15% on the air-broadening coefficient, and 0.45% on its temperature dependence. Analysis of potential biases of space-based DIAL CO2 mixing ratio measurements associated to spectroscopic parameter uncertainties are presented.

© 2009 Optical Society of America

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