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|Title:||Characterisation of GOME-2 formaldehyde retrieval sensitivity|
De Smedt, I.
|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.|
|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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|10.5194_AMT-6-371-2013.pdf||Published (publisher PDF)||3.32 MB||Adobe PDF||View/Open|
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