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European Geosciences Union, Atmospheric Measurement Techniques, 9(5), p. 2309-2319, 2012

DOI: 10.5194/amt-5-2309-2012

European Geosciences Union, Atmospheric Measurement Techniques Discussions, 3(5), p. 3303-3331

DOI: 10.5194/amtd-5-3303-2012

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Greenhouse gas measurements over a 144 km open path in the Canary Islands

Journal article published in 2012 by James Simon Anthony Brooke, P. F. Bernath, G. Kirchengast, C. B. Thomas, J.-G. Wang, K. A. Tereszchuk, G. Gonzalez Abad ORCID, G. Gonzalez Abad, R. J. Hargreaves ORCID, C. A. Beale, J. J. Harrison ORCID, S. Schweitzer, V. Proschek, P. A. Martin, V. L. Kasyutich and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Abstract. A new technique for the satellite remote sensing of greenhouse gases in the atmosphere via the absorption of short-wave infrared laser signals transmitted between counter-rotating satellites in low Earth orbit has recently been proposed; this would enable the acquisition of a long-term, stable, global set of altitude-resolved concentration measurements. We present the first ground-based experimental demonstration of this new infrared-laser occultation method, in which the atmospheric absorption of CO2 near 2.1 μm was measured over a ~144 km path length between two peaks in the Canary Islands (at an altitude of ~2.4 km), using relatively low power diode lasers (~4 to 10 mW). The retrieved CO2 volume mixing ratio of 400 ppm (±15 ppm) is consistent within experimental uncertainty with simultaneously recorded in situ validation measurements. We conclude that the new method has a sound basis for monitoring CO2 in the free atmosphere; other greenhouse gases such as methane, nitrous oxide and water vapour can be monitored in the same way.