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Glyoxal vertical columns from GOME-2 backscattered light measurements and comparisons with a global model

by C. Lerot, T. Stavrakou, I. De Smedt, J. F. M̈uller, M. Van Roozendael
Atmospheric Chemistry and Physics ()

Abstract

Glyoxal vertical column densities have been retrieved from nadir backscattered radiances measured from 2007 to 2009 by the spaceborne {GOME-2/METOP-A} sensor. The retrieval algorithm is based on the {DOAS} technique and optimized settings have been used to determine glyoxal slant columns. The liquid water absorption is accounted for using a two-step {DOAS} approach, leading to a drastic improvement of the fit quality over remote clear water oceans. Air mass factors are calculated by means of look-up tables of weighting functions pre-calculated with the {LIDORT} v3.3 radiative transfer model and using a priori glyoxal vertical distributions provided by the {IMAGESv2} chemical transport model. The total error estimate comprises random and systematic errors associated to the {DOAS} fit, the air mass factor calculation and the cloud correction. The highest glyoxal vertical column densities are mainly observed in continental tropical regions, while the mid-latitude columns strongly depend on the season with maximum values during warm months. An anthropogenic signature is also observed in highly populated regions of Asia. Comparisons with glyoxal columns simulated with {IMAGESv2} in different regions of the world generally point to a missing glyoxal source, most probably of biogenic origin.

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