Airborne Mid-Infrared Cavity enhanced Absorption spectrometer (AMICA)

Medientyp: E-Artikel
Titel: Airborne Mid-Infrared Cavity enhanced Absorption spectrometer (AMICA)
Beteiligte: Kloss, Corinna [VerfasserIn]; Tan, Vicheith [VerfasserIn]; Qiu, Chenxi [VerfasserIn]; von Hobe, Marc [VerfasserIn]; Leen, J. Brian [VerfasserIn]; Madsen, Garrett L. [VerfasserIn]; Gardner, Aaron [VerfasserIn]; Du, Xu [VerfasserIn]; Kulessa, Thomas [VerfasserIn]; Schillings, Johannes [VerfasserIn]; Schneider, Herbert [VerfasserIn]; Schrade, Stefanie [VerfasserIn]
Erschienen: Copernicus, 2021
Erschienen in: Atmospheric measurement techniques 14(8), 5271 - 5297 (2021). doi:10.5194/amt-14-5271-2021 special issue: "StratoClim stratospheric and upper tropospheric processes for better climate predictions"
Sprache: Englisch
DOI: https://doi.org/10.5194/amt-14-5271-2021
ISSN: 1867-8548; 1867-1381
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Beschreibung: We describe the Airborne Mid-Infrared Cavity enhanced Absorption spectrometer (AMICA) designed to measure trace gases in situ on research aircraft using Off-Axis Integrated Cavity Output Spectroscopy (OA-ICOS). AMICA contains two largely independent and exchangeable OA-ICOS arrangements, allowing for the simultaneous measurement of multiple substances in different infrared wavelength windows tailored to scientific questions related to a particular flight mission. Three OA-ICOS setups have been implemented with the aim to measure OCS, CO2, CO, and H2O at 2050 cm−1; O3, NH3, and CO2 at 1034 cm−1; and HCN, C2H2, and N2O at 3331 cm−1. The 2050 cm−1 setup has been characterized in the laboratory and successfully used for atmospheric measurements during two campaigns with the research aircraft M55 Geophysica and one with the German HALO (High Altitude and Long Range Research Aircraft). For OCS and CO, data for scientific use have been produced with 5 % accuracy (15 % for CO below 60 ppb, due to additional uncertainties introduced by dilution of the standard) at typical atmospheric mixing ratios and laboratory-measured 1σ precision of 30 ppt for OCS and 3 ppb for CO at 0.5 Hz time resolution. For CO2, high absorption at atmospheric mixing ratios leads to saturation effects that limit sensitivity and complicate the spectral analysis, resulting in too large uncertainties for scientific use. For H2O, absorption is too weak to be measured at mixing ratios below 100 ppm. By further reducing electrical noise and improving the treatment of the baseline in the spectral retrieval, we hope to improve precision for OCS and CO, resolve the issues inhibiting useful CO2 measurements, and lower the detection limit for H2O. The 1035 and 3331 cm−1 arrangements have only partially been characterized and are still in development. Although both setups have been flown and recorded infrared spectra during field campaigns, no data for scientific use have yet been produced due to unresolved deviations of the retrieved mixing ratios to known ...
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