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List of Abstracts 179masses and evaluating how ozone depends on nitrogen compounds. As a consequence, the chemical linkbetween O3 and HNO3 remains poorly known in the lower layers.In this study, we use aircraft observations of O3 and HNO3 from the NASA ARCTAS and NOAA ARCPACcampaigns during spring and summer of 2008 together with HNO3 and O3 satellite data from the IASIinstrument and a global chemical transport model (MOZART) to better understand the sources, transport andvariability of these compounds in the Arctic. The results are discussed in terms of O3-NOy chemistry, andthe role of HNO3 as a reservoir of NOx is also investigated. These analyses also help us to quantify thecontribution of the stratosphere to the tropospheric ozone budget in the Arctic.P-Observations 2.29 ID:4326 10:30Role of drop distortion in enhancing the lightning activity in clouds formed over citiesRohini Bhalwankar, A.K. KamraIndian Institute of Tropical MeteorologyContact: rohini@tropmet.res.inAtmospheric pollutants are believed to modify the electrification and the lightning activity in thunderclouds.Results of a laboratory simulation experiment in which distilled/polluted water drops are suspended in avertical wind tunnel to study their distortion characteristics in absence and presence of a horizontal electricfield, are discussed in this context. Distortion of water drops is more when drops are formed from the waterpolluted with Ammonium Sulphate or Potassium Nitrate than that from distilled water and the difference indistortions is more in higher electric field. Further, the polluted water drops falling in horizontal electric fieldcan trigger a discharge and the discharge can propagate as a streamer in lower electric fields as compared tothat from distilled water drops. The difference in electrical conductivity of polluted and unpolluted waterdrops is most likely the key factor for manifestation of these differences. It is proposed that the enhanceddistortion of polluted drops coupled with the change in their characteristics to trigger and propagate adischarge in lower electric field may significantly contribute to the enhancement of lightning activityobserved in the clouds formed over big cities.P-Observations 2.30 ID:4407 10:30Measurements of NO2-profiles during the CINDI campaignFolkard Wittrock 1 , Katrijn Clemer 2 , Michel Van Roozendael 2 , Stijn Berkhout 3 , Dominik Brunner 4 , UdoFriess 5 , Tim Hay 6 , Ankie Pieters 7 , Tim Vlemmix 7 , Hitoshi Irie 8 , Thomas Wagner 9 , Elena Spinei 101 University of Bremen, Institute of Environmental Physics, Germany2 IASB-BIRA, Brussels, Belgium3 RIVM, Bilthoven, The Netherlands4 EMPA, Dübendorf, Suisse5 University of Heidelberg, iup Heidelberg, Germany6 NIWA, Lauder, New Zealand7 KNMI, De Bilt, The Netherlands8 JAMSTEC, Japan9 MPI Chemistry, Mainz, Germany10 WSU, Washington, USAContact: folkard@iup.physik.uni-bremen.deSatellite measurements of tropospheric constituents have advanced significantly over the last decade, nowproviding near global measurements of a number of species relevant in tropospheric chemistry (e.g. CO,NO2, HCHO, SO2, CHO.CHO). With improving spatial resolution, these data sets move towards airpollution monitoring and even air quality assessment. However, the integrating nature of this type of remoteiCACGP-IGAC 2010 14 July, 2010