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List of Abstracts 6level and/or decreased high-level clouds. We present results from a GISS climate simulation in which BCreduction resulted in fewer clouds and minimal climate cooling.We discuss uncertainties in models and observations and recommendations for future research.Observations 1.1 ID:4248 14:35Results from 6 years of operation of the Ozone Monitoring Instrument (OMI)Pawan Bhartia 1 , Pieternel Levelt 2 , Johanna Tamminen 3 , Pepijn Veefkind 4 , Joanna Joiner 1 , JeraldZiemke 1 , Omar Torres 5 , Nickolay Krotkov 11 NASA Goddard Space Flight Center2 Royal Dutch Meteorological Institute (KNMI) & Eindhoven University of Technology3 Finnish Meteorological Institute (FMI)4 Royal Dutch Meteorological Institute (KNMI)5 Hampton UniversityContact: pawan.bhartia@nasa.govThe Ozone Monitoring Instrument (OMI) is a Dutch-Finnish built instrument that will complete 6 years ofoperation in orbit this year on NASA’s Aura spacecraft. Though several UV/VIS backscatter instrumentshave flown in space in the past 4 decades, OMI is the first instrument of this type that has been optimized totrack small-scale variabilities in tropospheric traces gases and UV-absorbing aerosols. The Aura spacecrafthas 4 instruments dedicated to atmospheric chemistry and air quality research and the spacecraft itself isapart of a novel multi-spacecraft constellation called the A-train. This allows synergistic use of data frommultiple instruments. In this talk we will focus on the study of inter- annual variability of tropospheric tracegases and aerosols derived from 6 years of OMI data and will discuss several multi-instrument products thathave been successfully produced by combining OMI data with data from other A-train instruments. Thepresentation will include discussion of uncertainties in these products, particular those related to the effectsof clouds on satellite retrieval of boundary layer trace gases, and our ongoing efforts in reducing theseuncertainties. Finally, we will discuss how we are incorporating lessons learned from these studies indesigning more advanced sensors to study air quality from space.Observations 1.2 ID:4551 14:50Global correlation patterns of ozone and CO derived from TES observations and model simulationsApostolos Voulgarakis 1 , Drew Shindell 1 , Kevin Bowman 2 , Paul Telford 3 , John Pyle 3 , Adetutu Aghedo 2 ,Peter Braesicke 31 NASA Goddard Institute for Space Studies and Columbia University CCSR, New York, USA2 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA3 Centre for Atmospheric Science, NCAS, Chemistry Department, University of Cambridge, UKContact: avoulgarakis@giss.nasa.govSimultaneous measurements of ozone and CO taken over 5 years by the Tropospheric EmissionSpectrometer (TES) provide a unique opportunity to examine global correlation patterns and the processescontrolling those patterns. Here, we use measurements and output from four chemistry-climate andchemistry-transport models (GISS, ECHAM5-MOZ, UKCA, p-TOMCAT), to examine how midtroposphericozone and CO correlate in different regions and seasons. We find a remarkable agreementbetween the correlation patters in the observations and in the models. A prominent feature is a contrastbetween much of the Northern Hemisphere and the Southern Hemisphere, with mostly negative correlationsin the former and positive correlations in the latter. An exception to this is the Northern Pacific, where theiCACGP-IGAC 2010 12 July, 2010