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000907363 1001_ $$0P:(DE-Juel1)129105$$aUngermann, Jörn$$b0$$eCorresponding author
000907363 245__ $$aQuantification and mitigation of the instrument effects and uncertainties of the airborne limb imaging FTIR GLORIA
000907363 260__ $$aKatlenburg-Lindau$$bCopernicus$$c2022
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000907363 500__ $$aThis research has been supported by the Bundesministerium für Bildung und Forschung (grant no. 01 LG 1907), the Deutsche Forschungsgemeinschaft (grant no. SPP 1294), and the European Metrology Programme for Innovation and Research (grant no. 16ENV03).I did not find these grants in the list.
000907363 520__ $$aThe 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 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 1σ bound of 1 % on the instrument gain error and a bound of 30 nW cm−2 sr−1 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 ppm 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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000907363 7001_ $$0P:(DE-HGF)0$$aKleinert, Anne$$b1
000907363 7001_ $$0P:(DE-HGF)0$$aMaucher, Guido$$b2
000907363 7001_ $$0P:(DE-Juel1)172794$$aBartolomé, Irene$$b3
000907363 7001_ $$00000-0003-2016-2800$$aFriedl-Vallon, Felix$$b4
000907363 7001_ $$00000-0002-9642-1955$$aJohansson, Sören$$b5
000907363 7001_ $$0P:(DE-Juel1)169740$$aKrasauskas, Lukas$$b6
000907363 7001_ $$0P:(DE-Juel1)133921$$aNeubert, Tom$$b7
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