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List of Abstracts 88UT. The seasonal cycle of PAN is investigated for MIPAS-E full-resolution data in 2003. Data from theMIPAS-E optimised-resolution period are compared to measurements made during the recent POLARCATcampaign over Greenland and the Arctic in the summer of 2008 and INTEX-B over North America in Apriland May 2006, with the main focus on the quality of peroxyacetyl nitrate. Comparisons are also made withACE satellite data in the March 2004 period, exploiting the overlap between MIPAS-E full-resolution dataand beginning of the SCISAT mission. We finally compare these organic compound data products to outputfrom the TOMCAT model and evaluate the consistency between the measurements and the model. Weshow, in this work, that the MIPAS-E is providing unprecedented global VOC data with good spatialresolution, providing very important new datasets with which to study the UT. This work on VOCs has thepotential to feed into retrieval studies for possible future missions, such as PREMIER.P-Observations 1.6 ID:4188 15:35Fog and cloud induced aerosol modification observed by AERONETThomas Eck 1 , Brent Holben 2 , Jeffrey Reid 3 , David Giles 2 , Miguel Rivas Avila 4 , Ramesh Singh 5 ,Sachchida Tripathi 6 , Carol Bruegge 7 , Giuseppe Zibordi 8 , Alexander Sinyuk 2 , Alexander Smirnov 21 NASA GSFC/GEST, Greenbelt, MD USA2 NASA GSFC, Greenbelt, MD USA3 Naval Research Laboratory, Monterey, CA, USA4 Universidad de Tarapaca, Arica, Chile5 Chapman University, CA, USA6 Indian Institute of Technology, Kanpur, India7 NASA/ Jet Propulsion Laboratory, Pasadena, CA USA8 Joint Research Centre, ISPRA, ItalyContact: thomas.f.eck@nasa.govThe modification of aerosol optical properties due to the interaction with fog or clouds is examined frommeasurements made by sun/sky radiometers at several AERONET sites. Almucantar retrievals, which utilizemeasured sky radiances and spectral aerosol optical depth, are examined for cases where fog and/or cloudshave recently dissipated or advected away. Retrieved volume size distributions for cases identified as aerosolmodified by cloud show very large median fine mode radius (~0.25-0.42 microns), which often show abimodal sub-micron distribution. This bimodal accumulation mode distribution may be due to one mode (thelarger one) from cloud-processed aerosol and the other from interstitial aerosol, or possibly from twodifferent aerosol species (differing chemical composition) with differing hygroscopic growth factors. Thesize of the fine mode particles from AERONET retrieved for these cases exceeds the size of sub-micronsized particles retrieved for nearly all other aerosol types, suggesting significant modification of aerosolswithin the fog or cloud environment. The almucantar retrievals are analyzed from the Kanpur site in theIndo-Gangetic Plain in India (fog in January), Arica on the northern coast of Chile (stratocumulus), Fresno,CA in the San Joaquin Valley (fog in winter), and several other sites with aerosol observations made whenclouds dissipate or gaps occur in cloud cover. In-situ measured aerosol size distributions made during fogevents are compared to the AERONET retrievals.P-Observations 1.7 ID:4540 15:35Development of cloud property retrieval algorithm for nadir measurements.Chia Ruei Hu, James Sloan1 University of Waterloo2 Universdity of WaterlooContact: c5hu@uwaterloo.caiCACGP-IGAC 2010 12 July, 2010