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List of Abstracts 8atmosphere due to climate change and air pollution. Within this data set, altitude-resolved data are requiredbecause many processes occur at specific altitudes or over limited vertical length scales. Solar occultationhas proven to be an effective technique for measuring profiles of atmospheric trace gases and aerosols. Thispaper will discuss the results from the Canadian-led Atmospheric Chemistry Experiment (ACE), a satellitemission using the solar occultation technique, and the need to continue measurements of this type foratmospheric monitoring and scientific studies.Launched on 13 August 2003, the ACE satellite uses infrared and UV-visible spectroscopy to investigate thechemical composition of the Earth's atmosphere. The primary instrument on-board, the ACE FourierTransform Spectrometer (ACE-FTS) is a high-resolution (0.02 cm -1 ) FTS operating between 750 and 4400cm -1 . It also contains two filtered imagers (0.525 and 1.02 microns) to measure atmospheric extinction due toclouds and aerosols. The second instrument is a dual UV-visible-NIR spectrophotometer called ACE-MAESTRO (Measurements of Aerosol Extinction in the Stratosphere and Troposphere Retrieved byOccultation), which extends the ACE wavelength coverage to the 280-1030 nm spectral region. The ACE-FTS and ACE-MAESTRO have been making regular solar occultation measurements for nearly 6.5 yearsand, from these measurements, altitude profiles of over 30 different atmospheric trace gas species, aerosolsand temperature are obtained.P-Sources.1 ID:4521 15:35Can we reconcile reported emissions of SF6 with atmospheric observations?Gabrielle Petron 1 , Ed Dlugokencky 2 , Jean-Francois Lamarque 3 , Geoff Dutton 2 , Brad Hall 2 , KenMasarie 2 , John Miller 1 , Tanja Schuck 4 , Carl Brenninkmeijer 4 , Manfred Maiss 5 , Jos Olivier 6 , PieterTans 21 NOAA ESRL & University of Colorado CIRES2 NOAA ESRL3 NCAR4 MPI Mainz5 DFS6 MNPContact: gabrielle.petron@noaa.govSF6 is one of the most potent greenhouse gases known to date. As such it is one of the six gases covered bythe Kyoto Protocol. NOAA ESRL has been measuring SF6 from a global network of sampling locationssince 1997. The analysis of two air archives, Cape Grim and Niwot Ridge, provide data back from 1978 and1986 respectively. SF6 natural background levels are very low. Due to its extreme stability, SF6 has beenused since the 1950s in various industrial applications, the most important one being electricity transmissionand distribution. Due to its very long lifetime (>1000 years), its atmospheric mean mixing ratio has beenincreasing from 0.03ppt in 1970 to 6.8ppt in 2009. These atmospheric measurements show that global sourceof SF6 is significantly greater than the total emissions reported to the United Nations FrameworkConvention on Climate Change (UNFCCC) by Annex II countries, and the difference can not be made up byinclusion of emissions from rapidly developing countries. We show the evolution of the SF6 mixing ratio atdifferent locations and compare the rate of increase with bottom-up inventories (such as EDGAR) and withemissions estimates reported to the UN. To understand how the global distribution of emissions affect theregional and global distribution of SF6 and what kind of observing network would be needed to verifyemissions at the continental scale, several emissions scenarios have been run in the CAM global atmosphericcirculation model from 1970 onward.iCACGP-IGAC 2010 12 July, 2010