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Sources and trends of Tropospheric Formaldehyde (HCHO) derived from GOME-1 and -2, and SCIAMACHY

Thierry Marbach(1), Steffen Beirle(1) and Thomas Wagner(1)

(1) Max-Planck Institute for Chemistry, J. J. Becher Weg 27, 55128 Mainz, Germany

Abstract

We present sources and trends for tropospheric Formaldehyde (HCHO) derived from satellite observations made by the GOME-1 and -2 instruments as well as from SCIAMACHY. Launched on the ERS-2 satellite 1995, GOME-1 has already performed continuous operations over 8 years providing global observations of different trace gases. GOME-2 has been launched onboard of METOP-A in October 2006. This instrument allow an improvement in the trace gas observations through a better resolution (80x40 km2, 320x40 km2 for GOME-1) with an almost daily earth coverage at equator (3 days needed for GOME-1). The datasets from SCIAMACHY (launched in 2002 onboard ENVISAT) have an overlap with both GOME-1and -2 datasets. That gives the possibility to have time-series over one decade. This long term satellite observations provide the opportunity to establish trends over specific regions for various trace gases. Here, the satellite observations of HCHO are analyzed providing information concerning different types of sources, e.g. biogenic emissions like isoprene, biomass burning (intense source of HCHO over the Amazon basin region and in central Africa or Indonesia), and anthropogenic emissions over densely populated regions and also over ocean (ship track corridor).