Spectroscopic challenges for high accuracy retrievals of atmospheric CO<sub>2</sub> and the Orbiting Carbon Observatory (OCO) experiment

Charles E. Miller; Linda R. Brown; Robert A. Toth; D. Chris Benner; V. Malathy Devi

doi:10.1016/j.crhy.2005.09.005

Spectroscopy and planetary atmospheres/Spectroscopie et atmosphères planétaires

Spectroscopic challenges for high accuracy retrievals of atmospheric CO₂ and the Orbiting Carbon Observatory (OCO) experiment

Charles E. Miller ¹ ; Linda R. Brown ¹; Robert A. Toth ¹; D. Chris Benner ²; V. Malathy Devi ²

¹ Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USA
² Department of Physics, College of William and Mary, Williamsburg, VA 23187-8795, USA

Comptes Rendus. Physique, Molecular spectroscopy and planetary atmospheres, Volume 6 (2005) no. 8, pp. 876-887.

Abstract
Résumé

The space-based Orbiting Carbon Observatory (OCO) mission will achieve global measurements needed to distinguish spatial and temporal gradients in the CO₂ column. Scheduled by NASA to launch in 2008, the instrument will obtain averaged dry air mole fraction $(X_{{CO}_{2}})$ with a precision of 1 part per million (0.3%) in order to quantify the variation of CO₂ sources and sinks and to improve future climate forecasts. Retrievals of $X_{{CO}_{2}}$ from ground-based measurements require even higher precisions to validate the satellite data and link them accurately and without bias to the World Meteorological Organization (WMO) standard for atmospheric CO₂ observations. These retrievals will require CO₂ spectroscopic parameters with unprecedented accuracy. Here we present the experimental and data analysis methods implemented in laboratory studies in order to achieve this challenging goal.

La mission spatiale Orbiting Carbon Observatory (OCO) fournira les mesures globales nécessaires pour étudier les gradients spatiaux et temporels des quantités de CO₂ dans notre atmosphère. Avec une mise en orbite prévue par la NASA en 2008, cet instrument déterminera la fraction molaire $(X_{{CO}_{2}})$ moyenne avec une précision de une partie par million (1 ppm, 0.3%) afin de quantifier les variations des sources et puits de CO₂ et d'améliorer les prévisions météorologiques à venir. Les déterminations de $X_{{CO}_{2}}$ à partir du sol devront avoir une précision encore supérieure afin de valider les données satellites pour qu'elles satisfassent, sans biais, les standards de la World Meteorological Organization (WMO) pour ce qui concerne les observations du CO₂ atmosphérique. Ces mesures par télédétection dans l'infrarouge proche nécessiteront de connaître les paramètres spectroscopiques avec une précision sans précédent. Cet article présente les méthodes expérimentales et d'analyse des données qui sont développées au laboratoire afin d'atteindre cet objectif.

Published online: 2005-10-01

DOI: 10.1016/j.crhy.2005.09.005

Keywords: Carbon dioxide (CO₂), Orbiting Carbon Observatory (OCO), Near infrared spectroscopy
Mots-clés : Dioxyde de carbone (CO₂), Orbiting Carbon Observatory (OCO), Spectroscopie proche infrarouge

Author's affiliations:

Charles E. Miller ¹; Linda R. Brown ¹; Robert A. Toth ¹; D. Chris Benner ²; V. Malathy Devi ²

¹ Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USA
² Department of Physics, College of William and Mary, Williamsburg, VA 23187-8795, USA

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     author = {Charles E. Miller and Linda R. Brown and Robert A. Toth and D. Chris Benner and V. Malathy Devi},
     title = {Spectroscopic challenges for high accuracy retrievals of atmospheric {CO\protect\textsubscript{2}} and the {Orbiting} {Carbon} {Observatory} {(OCO)} experiment},
     journal = {Comptes Rendus. Physique},
     pages = {876--887},
     publisher = {Elsevier},
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     number = {8},
     year = {2005},
     doi = {10.1016/j.crhy.2005.09.005},
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Charles E. Miller; Linda R. Brown; Robert A. Toth; D. Chris Benner; V. Malathy Devi. Spectroscopic challenges for high accuracy retrievals of atmospheric CO₂ and the Orbiting Carbon Observatory (OCO) experiment. Comptes Rendus. Physique, Molecular spectroscopy and planetary atmospheres, Volume 6 (2005) no. 8, pp. 876-887. doi : 10.1016/j.crhy.2005.09.005. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2005.09.005/

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