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| Titel |
Continuous spectroscopic measurement of methane isotopes and ethane made on
board an aircraft: instrument configuration and characterisation |
| VerfasserIn |
Joseph Pitt, Stuart Young, James Hopkins, James Lee, Stephane Bauguitte, James Dorsey, Grant Allen, Martin Gallagher, Tara Yacovitch, Mark Zahniser, Rebecca Fisher, Dave Lowry, Euan Nisbet |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250144609
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| Publikation (Nr.) |
 EGU/EGU2017-8456.pdf |
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| Zusammenfassung |
| We describe the configuration of two commercially available absorption spectrometers for
use on board the UK Facility for Airborne Atmospheric Research (FAAM) aircraft. A dual
laser instrument has been used to make continuous measurements of the atmospheric
13CH4:12CH4 ratio and ethane mole fraction, using an interband cascade laser (ICL) and a
recently developed type of diode laser respectively. Simultaneous measurements of
atmospheric ethane have also been made using a single laser instrument employing an ICL,
enabling instrument inter-comparison.
Instrument performance is evaluated over a series of test flights, and initial results from
the MOYA (Methane Observations and Yearly Assessments) campaign, targeting
biomass burning plumes in west Africa, are also presented. We describe the calibration
procedure and data analysis approaches for methane isotope measurement, involving
calibration over a range of methane isotopic composition and methane mole fraction.
We assess the effectiveness of this calibration technique during the first MOYA
campaign period using measurements of a target cylinder of known composition. |
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