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seasonal variations. Moreover, the maxima of glyoxal were found during the warm
seasons, as consequence of increase in the isoprene emissions. Additionally, strong
negative correlation between glyoxal columns and EVI were found over Africa
caused by large
fires events over these regions, which mainly occur outside the
growing season.
Acknowledgments Leonardo Alvarado gratefully acknowledges funding by the German Aca-
demic Exchange Service (DAAD). We acknowledge financial support provided by the University
of Bremen and the Earth System Science Research School (ESSReS), an initiative of the Helm-
holtz Association of German Research Centres (HGF) at the Alfred Wegener Institute for Polar
and Marine Research (AWI). OMI lv1 and EVI MODIS data have been provided by NASA.
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