A lightweight balloon-borne laser diode sensor for the in-situ measurement of CO2 at 2.68 micron in the upper troposphere and the lower stratosphere |
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| Authors: | M. Ghysels G. Durry N. Amarouche J. Cousin L. Joly E. D. Riviere L. Beaumont |
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| Affiliation: | (1) Groupe de Spectrom?trie mol?culaire et Atmosph?rique, UMR CNRS 6089, Universit? de Reims, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France;(2) IPSL, Laboratoire Atmosph?res, Milieux, Observations Spatiales, UMR CNRS 8190, 78280 Guyancourt, France;(3) Division technique de l’Institut National des Sciences de l’Univers, UPS CNRS 855, 92195 Meudon C?dex, France |
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| Abstract: | We report the development of a laser sonde operated under stratospheric balloons and devoted to the in-situ measurement of carbon dioxide in the upper troposphere and the lower stratosphere. In the 2.68 micron region, strong CO2 transitions are suitable for the in-situ monitoring of carbon dioxide, which gives ∼10% absorption depth and, moreover, antimonide laser diodes are nowadays available that show relevant spectral properties for absorption spectroscopy. The light-weight sensor is based on 50-cm single path configuration and is operated open to the atmosphere. We provide details of the design of the instrument and data processing. The performance and the stability of the instrument were evaluated with the Allan variance technique. The spectrometer was test-flown in the Arctic stratosphere from Kiruna, Sweden and we report preliminary flight results. |
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