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List of Abstracts 114with the CCATT-BRAMS 3D atmospheric chemical transport model, developed and maintained by INPE,Brazil. Boundary conditions were supplied by global model MOCAGE with chemistry scheme RELACS. Inthe coupling with CCATT-BRAMS using chemical mechanism RACM, an unrealistic oscillation near theboundary was observed, which was solved through the incorporation of RELACS in CCATT-BRAMS aspart of this work. The behavior of the model was evaluated through sensitivity tests.Sources 1.3 ID:4408 14:15Constraining NH3 emissions using remote sensing and surface observationsDaven Henze 1 , Karen Cady-Pereira 2 , Ming Lou 3 , Reinhard Beer 3 , Robert Pinder 4 , John Walker 4 , JesseBash 41 University of Colorado2 AER Inc.3 Jet Propulsion Laboratory4 US EPAContact: daven.henze@colorado.eduUncertainties in NH3 emissions poses challenges to air quality modeling, development of pollution controlstrategies, and understanding the global transport pathways of reactive nitrogen. We present the first resultsof inverse modeling of NH3 emissions using new remote sensing observations from TES. Capabilities andlimitations for constraining NH3 sources and variability with this data are assessed via inverse modelingtests using pseudo observations (generated by the model). The adjoint-based inverse model is then appliedover North America using real observations from the year 2008. The resulting constraints on NH3inventories are evaluated through cross validation with independent data sets and qualified with calculationof uncertainty reductions. Lastly, the impacts of constraining NH3 emissions on control strategies aredetermined through novel application of the adjoint model as a sensitivity tool, pinpointing nonattainment toinfluences from specific emissions locations, sectors, and sources. Benefits of accomplishing these goalsare to further our overall knowledge of the environmental impacts of NH3 emissions by affording betterestimates of incidents of excessively harmful PM2.5 levels using air quality models as well as reducinguncertainty in quantifying the sources and fate of ecologically disruptive levels of reactive nitrogen. NH3inventory improvements also enhance calculated emission control efficiencies by more precisely accountingfor the response of PM2.5 concentrations to existing or proposed mitigation strategies, thereby targetingemissions controls that minimize risk and cost while maximizing societal benefits.Sources 1.4 ID:4175 14:30Space-based constraints on global sulfur dioxide emissionsChulkyu Lee 1 , Randall Martin 1 , Aaron Van Donkelaar 1 , Konstantine Vinnikov 2 , Russell Dickerson 2 ,Nickolay Krotkov 3 , Andreas Richter 41 Dalhousie University2 University of Maryland3 GEST, University of Maryland, Baltimore County4 University of BremenContact: randall.martin@dal.caSulfur dioxide (SO2) emissions from anthropogenic and natural sources are oxidized quickly in theatmosphere, leading to aerosol formation and acid deposition. We use satellite observations fromSCIAMACHY and OMI to produce top-down constraints on SO2 emissions. We evaluated sulfur dioxide(SO2) columns from two satellite instruments (SCIAMACHY and OMI) with surface SO2 measurements.The surface-level SO2 mixing ratios are inferred by applying local scaling factors from a global chemicaliCACGP-IGAC 2010 13 July, 2010