Comparison of column abundances from three infrared spectrometers during AASE 2

Physics

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Abundance, Air Pollution, Air Sampling, Arctic Regions, Atmospheric Chemistry, Atmospheric Pressure, Atmospheric Temperature, Emission Spectra, Pollution Monitoring, Spectroscopic Analysis, Airborne Equipment, Dc 8 Aircraft, Fourier Transformation, Infrared Spectrometers, Least Squares Method, Line Spectra, Pressure Measurement

Scientific paper

Three Fourier transform infrared (FTIR) spectromenters were based on board the NASA DC-8 during the second Airborne Arctic Stratospheric Expedition (AASE II) in 1992. Two FTIRs used solar absorption and one used thermal emission. We compare over 2000 measurements from these 3 FTIRs, on 12 DC-8 flights, for closely coincident air masses and times, both inside and outside the polar vortex. In the majority of cases the offset biases are quite small, in the range 1-4%, and comparable to the absolute precisions expected. In most cases the rms scatter is in the range 4-11%; this scatter is unlikely to be geophysical, but rather is probably instrumental or analytical in origin.

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