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Title: Characterisation of GOME-2 formaldehyde retrieval sensitivity
Authors: Hewson, W.
Boesch, H.
Barkley, M.P.
De Smedt, I.
First Published: 18-Feb-2013
Publisher: Copernicus GmbH (Copernicus Publications) on behalf of the European Geosciences Union (EGU)
Citation: Atmospheric Measurement Techniques, 2013, 6 (2), pp. 371-386
Abstract: Formaldehyde (CH[subscript 2]O) is an important tracer of tropospheric photochemistry, whose slant column abundance can be retrieved from satellite measurements of solar backscattered UV radiation, using differential absorption retrieval techniques. In this work a spectral fitting sensitivity analysis is conducted on CH[subscript 2]O slant columns retrieved from the Global Ozone Monitoring Experiment 2 (GOME-2) instrument. Despite quite different spectral fitting approaches, the retrieved CH[subscript 2]O slant columns have geographic distributions that generally match expected CH[subscript 2]O sources, though the slant column magnitudes and corresponding uncertainties are particularly sensitive to the retrieval set-up. The choice of spectral fitting window, polynomial order, I[subscript 0] correction, and inclusion of minor absorbers tend to result in the largest modulations of retrieved slant column magnitude and fit quality. However, application of a reference sector correction using observations over the remote Pacific Ocean is shown to largely homogenise the resulting CH[subscript 2]O vertical columns obtained with different retrieval settings, thereby largely reducing any systematic error sources from spectral fitting.
DOI Link: 10.5194/amt-6-371-2013
ISSN: 1867-1381
eISSN: 1867-8548
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2013 The authors. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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