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In-Flight Retrieval of SCIAMACHY Instrument Spectral Response Function

Remote Sensing Technology Institute, German Aerospace Center (DLR), Oberpfaffenhofen, 82234 Wessling, Germany
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(3), 401;
Received: 21 December 2017 / Revised: 20 February 2018 / Accepted: 23 February 2018 / Published: 5 March 2018
(This article belongs to the Section Atmosphere Remote Sensing)
The instrument Spectral Response Function (ISRF) has a strong impact on spectral calibration and the atmospheric trace gases retrievals. An accurate knowledge or a fine characterization of the ISRF shape and its FWHM (Full width at half maximum) as well as its temporal behavior is therefore crucial. Designing a strategy for the characterization of the ISRF both on ground and in-flight is critical for future missions, such as the spectral imagers in the Copernicus program. We developed an algorithm to retrieve the instrument ISRF in-flight. Our method uses solar measurements taken in-flight by the instrument to fit a parameterized ISRF from on ground based calibration, and then retrieves the shape and FWHM of the actual in-flight ISRF. With such a strategy, one would be able to derive and monitor the ISRF during the commissioning and operation of spectrometer imager missions. We applied our method to retrieve the SCIAMACHY instrument ISRF in its different channels. We compared the retrieved ones with the on ground estimated ones. Besides some peculiarities found in SCIAMACHY channel 8, the ISRF results in other channels were relatively consistent and stable over time in most cases. View Full-Text
Keywords: SCIAMACHY; slit function; ISRF; remote sensing; atmosphere; trace gases; calibration SCIAMACHY; slit function; ISRF; remote sensing; atmosphere; trace gases; calibration
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MDPI and ACS Style

Hamidouche, M.; Lichtenberg, G. In-Flight Retrieval of SCIAMACHY Instrument Spectral Response Function. Remote Sens. 2018, 10, 401.

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