Laser diode absorption spectroscopy for accurate CO(2) line parameters at 2 microm: consequences for space-based DIAL measurements and potential biases.
Space-based active sensing of CO(2) concentration is a very promising technique for the derivation of CO(2) 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 CO(2) absorption line ((20(0)1)(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 CO(2) 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 CO(2) mixing ratio measurements associated to spectroscopic parameter uncertainties are presented.
Joly
Lilian
L
Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 6089, UFR SciencesExactes et Naturelles, BP 1039, 51687 Reims Cedex, France.
Marnas
Fabien
F
Gibert
Fabien
F
Bruneau
Didier
D
Grouiez
Bruno
B
Flamant
Pierre H
PH
Durry
Georges
G
Dumelie
Nicolas
N
Parvitte
Bertrand
B
Zéninari
Virginie
V