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List of Abstracts 217for the MBL conditions of Eastern Mediterranean. Size distributions of atmospheric ions and chargedaerosol particles with diameters 0.8-42 nm were measured with an Air Ion Spectrometer (AIS). Concurrentmeasurements of aerosol particles number size distributions with diameters 8 – 900 nm were performed withScanning Mobility Particle Sizer (SMPS). At the Finokalia station atmospheric nucleation has been found tobe a reoccurring phenomenon both during day and night. However the characteristics governing suchprocesses were found to be quite different. There were 53 nucleation events recorded during day-time andthe event to non-event days ratio was 0.21. Common observation for all the events was that the initialnucleation evident in AIS data was then followed by condensational growth of the new particles to largerdiameters and the subsequent recording of the event by the SMPS system. During the measuring period 42events of night-time nucleation were recorded as well. The event to non-event days ratio was found to be0.14. A common feature for all of the events is that no particle growth was observed probably due to the lackof significant amounts of condensable vapours during the night. Atmospheric nucleation at Finokalia, bothfor day and night, was found to be more frequent from February to April.P-Observations 2.99 ID:4516 10:30Atmospheric versus Riverine Nutrient Inputs to the Northeastern Levantine Basin of the EasternMediterraneanMustafa KocakEnvironmental Chemical Processes Laboratory, Department of Chemistry, University of CreteContact: muskocak@yahoo.comAerosol and rain samples were collected at a rural site located on the coastline of the Eastern Mediterranean,Erdemli, Turkey between January 1999 and December 2007. Riverine sampling was carried out at fiveRivers (Ceyhan, Seyhan, Göksu, Berdan and Lamas) draining into the Northeastern Levantine Basin (NLB)between March 2002 and July 2007. Samples were analyzed for macronutrients of phosphate, silicate, nitrateand ammonium (PO43-, Sidiss, NO3- and NH4+). Phosphate and silicate in aerosol and rainwater showedhigher and larger variation during the transitional period (March-May, September) when air flowspredominantly originate from North Africa and Middle East/Arabian Peninsula. Deficiency of alkalinematerial were found to be the main reason of the acidic rain events whilst high pH values (> 7) wereassociated with high Sidiss concentrations due to sporadic dust events. In general, lowest nitrate andammonium concentrations in aerosol and rainwater were associated with air flow from the MediterraneanSea. Unlike NO3- and NH4+ (Dissolved Inorganic Nitrogen, DIN), there were statistical differences forPO43- and Sidiss solubilities in sea-water and pure-water. Solubilities of PO43- and Sidiss were found to berelated with air mass back trajectories and pH. Atmospheric and riverine fluxes demonstrated that DIN andPO43- fluxes to NLB were dominated by atmosphere (~ 90 % and ~ 60 % respectively) whereas the input ofSi was mainly derived from riverine runoff (~ 90 %). N/P ratios (atmosphere~233; riverine~ 28) revealedthat NLB receives excessive amounts of DIN and this unbalanced P and N inputs may provoke even morephosphorus deficiency. Molar Si/N ratios (atmosphere + riverine) suggested Si limitation which might causea switch from diatom dominated phytoplankton communities to non-siliceous populations in NLB.P-Observations 2.100 ID:4449 10:30Impact of Fires on Air Quality in the Mediterranean during the Summer 2007: Constraint fromSatellite Observations (IASI/METOP, A-Train)Solene Turquety 1 , Pierre-François Coheur 2 , Daniel Hurtmans 2 , Cathy Clerbaux 3 , Juliette Hadji-Lazaro 3 ,Stavros Stromatas 4 , Hélène Chepfer 1 , Laurent Menut 1 , Didier Tanré 5 , Bertrand Bessagnet 61 Laboratoire de Meteorologie Dynamique/IPSL, Universite Pierre et Marie Curie - Paris 062 Spectroscopie de l’atmosphère, Chimie Quantique et Photophysique, Université Libre de BruxellesiCACGP-IGAC 2010 14 July, 2010