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List of Abstracts 108combination of UV- Vis and IR wavelengths can peer into the boundary layer and discriminate ozone fromthe ozone above. However, these studies have been limited to a few cases and for a few measurementspecifications. Our work focuses on systematically quantifying the characteristics of ozone measurementsthat include wavelengths from the ultraviolet through the infrared, considering a wide range of potentialspectral bands. In this work we find that to achieve the needed sensitivity, a combination of bands isrequired. The exact combinations that meet the sensitivity requirements is dependent on noise, spectralresolution, and the characteristics of the ozone field.Observations 2.3 ID:4487 09:00Atmospheric composition from geostationary orbit - Sentinel 4 UVN on Meteosat Third GenerationHeinrich Bovensmann 1 , Stefan Noel 1 , Klaus Bramstedt 1 , Patricia Liebing 1 , Andreas Richter 1 , VladimirRozanov 1 , Marco Vountas 1 , John P. Burrows 1 , Ben Veihelmann 21 Institute of Environmental Physics, University of Bremen2 ESA ESTEC, Atmospheric Section of the Mission Science Division, European Space AgencyContact: heinrich.bovensmann@iup.physik.uni-bremen.deThe Sentinel 4 UVN instrument is an UV-VIS-NIR imaging spectrometer and part of the geostationaryMeteosat Third Generation (MTG) satellite to be launched in 2017/18. UVN is designed to makemeasurements of the up welling radiation at the top of the atmosphere covering the wavelength range from305 nm to 500 nm and 750 nm to 775 nm at moderate to high spectral resolution (UV-VIS: 0.5 nm, NIR:0.12 nm) with a spatial resolution of 8 km x 8 km over Europe. It is designed to yield the total andtropospheric columns of several atmospheric constituents of great significance for European air pollutionand air quality applications: the gases Ozone O3, Nitrogen Dioxide, NO2, Sulphur Dioxide, SO2, andFormaldehyde HCHO. In addition, there is the potential to deliver Glyoxal (CHOCHO). Furthermore,aerosol information will be obtained. The presentation will summarise on the expected product quality.Observations 2.4 ID:4467 09:15Sensitivity of continental boundary layer chemistry to a new isoprene oxidation mechanismJingqiu Mao 1 , Fabien Paulot 2 , Daniel Jacob 1 , Paul Wennberg 21 Harvard University2 California Institute of TechnologyContact: jmao@seas.harvard.eduWe evaluate a new isoprene chemistry mechanism in the GEOS-Chem chemical transport model bysimulating observations from the NASA INTEX-A aircraft campaign over the eastern United States andNorth Atlantic during summer 2004. This new mechanism reflects new constraints on isoprene δ-hydroxychannels under high NO x (≡ NO + NO 2 ) conditions, and the formation of dihydroxyepoxides and OHregeneration under low NO x conditions. Model results are evaluated with observed ozone, HO x (≡ OH +HO 2 ), reactive nitrogen species, isoprene, and photochemical tracers. Sensitivity analyses are conducted toinvestigate the fate of isoprene-produced nitrates, peroxides and carboxylic acids in this new mechanism. Weuse the observed relationships between isoprene and OH concentrations in the continental boundary layer toevaluate the OH recycling efficacy. We also use the observed relationships between isoprene andformaldehyde (HCHO) columns to evaluate the time-dependent HCHO yield and its implications forinterpreting HCHO columns observed from space as a proxy for isoprene emissions. We will discuss theimplications of these updates of isoprene chemistry for simulation of ozone, OH, NO x and HCHO in globaltropospheric chemistry models.iCACGP-IGAC 2010 13 July, 2010