Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/28312
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
Links: http://www.atmos-meas-tech.net/6/371/2013/amt-6-371-2013.html
http://hdl.handle.net/2381/28312
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 (http://creativecommons.org/licenses/by/3.0/), 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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