[HTML][HTML] Quantification and mitigation of the instrument effects and uncertainties of the airborne limb imaging FTIR GLORIA
J Ungermann, A Kleinert, G Maucher… - Atmospheric …, 2022 - amt.copernicus.org
J Ungermann, A Kleinert, G Maucher, I Bartolomé, F Friedl-Vallon, S Johansson…
Atmospheric Measurement Techniques, 2022•amt.copernicus.orgAbstract The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is
an infrared imaging FTS (Fourier transform spectrometer) with a 2-D infrared detector that is
operated on two high-flying research aircraft. It has flown on eight campaigns and measured
along more than 300 000 km of flight track. This paper details our instrument calibration and
characterization efforts, which, in particular, almost exclusively leverage in-flight data. First,
we present the framework of our new calibration scheme, which uses information from all …
an infrared imaging FTS (Fourier transform spectrometer) with a 2-D infrared detector that is
operated on two high-flying research aircraft. It has flown on eight campaigns and measured
along more than 300 000 km of flight track. This paper details our instrument calibration and
characterization efforts, which, in particular, almost exclusively leverage in-flight data. First,
we present the framework of our new calibration scheme, which uses information from all …
Abstract
The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is an infrared imaging FTS (Fourier transform spectrometer) with a 2-D infrared detector that is operated on two high-flying research aircraft. It has flown on eight campaigns and measured along more than 300 000 of flight track.
This paper details our instrument calibration and characterization efforts, which, in particular, almost exclusively leverage in-flight data. First, we present the framework of our new calibration scheme, which uses information from all three available calibration sources (two blackbodies and upward-pointing “deep space” measurements). Part of this scheme is a new algorithm for correcting the erratically changing nonlinearity of a subset of detector pixels and the identification of the remaining bad pixels.
Using this new calibration, we derive a 1 bound of 1 % on the instrument gain error and a bound of 30 nW cm sr cm on the instrument offset error. We show how we can examine the noise and spectral accuracy for all measured atmospheric spectra and derive a spectral accuracy of 5 on average. All these errors are compliant with the initial instrument requirements.
We also discuss, for the first time, the pointing system of the GLORIA instrument. Combining laboratory calibration efforts with the measurement of astronomical bodies during the flight, we can achieve a pointing accuracy of 0.032, which corresponds to one detector pixel.
The paper concludes with a brief study of how these newly characterized instrument parameters affect temperature and ozone retrievals. We find that the pointing uncertainty and, to a lesser extent, the instrument gain uncertainty are the main contributors to the error in the result.
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