Radiometric calibration of the in-flight blackbody calibration system of the GLORIA interferometer

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Abstract

GLORIA (Gimballed Limb Observer for Radiance Imaging of the Atmosphere) is an airborne, imaging, infrared Fourier transform spectrometer that applies the limb-imaging technique to perform trace gas and temperature measurements in the Earth's atmosphere with three-dimensional resolution. To ensure the traceability of these measurements to the International Temperature Scale and thereby to an absolute radiance scale, GLORIA carries an on-board calibration system. Basically, it consists of two identical large-area and high-emissivity infrared radiators, which can be continuously and independently operated at two adjustable temperatures in a range from -50 C to 0 C during flight. Here we describe the radiometric and thermometric characterization and calibration of the in-flight calibration system at the Reduced Background Calibration Facility of the Physikalisch-Technische Bundesanstalt. This was performed with a standard uncertainty of less than 110 mK. Extensive investigations of the system concerning its absolute radiation temperature and spectral radiance, its temperature homogeneity and its short- and long-term stability are discussed. The traceability chain of these measurements is presented.

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Monte, C., Gutschwager, B., Adibekyan, A., Kehrt, M., Ebersoldt, A., Olschewski, F., & Hollandt, J. (2014). Radiometric calibration of the in-flight blackbody calibration system of the GLORIA interferometer. Atmospheric Measurement Techniques, 7(1), 13–27. https://doi.org/10.5194/amt-7-13-2014

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