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summarybothTDandNTDhavesimilaraerosolcharacteristics,i.e.,higherconcentrationof finemodeparticles,whicharemostlikely to be hygroscopic, for cloud development. Since it issummertime,theaerosolsmightnotbesoimportantduetothestrong mass convergence that ignites the convection. Never-theless, in other seasons this effect might completely different.AcknowledgmentsThe authors would like to thank the IAG-USP weatherstation for providing the meteorological data sets, NCEP formaking available the reanalysis, AERONET for the aerosoldistribution and University of Wyoming for releasing theradiosonde data. This work was partially supported by CNPqgrant#310489/2006-7andCoordenacaodeAperfeicoamentode Pessoal de Nivel Superior — CAPES.References Albrecht, R. I., 2008. Eletrificacao dos sistemas precipitantes na regiaoAmazonica: Processos fisicos e dinâmicos do desenvolvimento detempestades. PhD thesis, 182 pp., University of Sao Paulo.Andreae, M.O., Rosenfeld, D., Artaxo, P., Costa, A.A., Frank, G.P., Longo, K.M.,Silva-Dias, M.A.F., 2004. Smoking rain clouds over the amazon. Science303, 1337–1342 27 February 2004.Carvalho, L.M., Jones, C., Liebmann, B., 2002. Extreme precipitation events insoutheastern South America and lage-scale convective patterns in theSouth Atlantic Convergence Zone. J. Clim. 15, 2377–2394.Dametto, G. S., R. P. da Rocha, 2006. Caracteristicas climaticas dos sistemasfrontais na cidade de Sao Paulo. In: Anais do XIV Congresso Brasileiro deMeteorologia: A Meteorologia a Servico da Sociedade, Florianopolis – SC,27.11 – 01.12.2006, CD-ROM.Dubovik, O., King, M.D., 2000. A flexible inversion algorithm for retrieval ofaerosol optical properties from sun and sky radiance measurements.J. Geophys. Res. 105, 20,673–20,696.Dusek,U.,Frank,G.P.,Hildebrandt,L.,Curtius,J.,Schneider,J.,Walter,S.,Chand,D., Drewnick, F., Hings, S., Jung, D., Borrmann, S., Andreae, M.O., 2006. SizeMatters More Than Chemistry for Cloud-Nucleating Ability of AerosolParticles. Science 312 (5778), 1375–1378 2 June 2006, DOI: 10.1126/science.1125261.Farias, W.R.G., Pinto Jr., O., Naccarato, K.P., Pinto, I.R.C.A., 2009. AnomalouslightningactivityovertheMetropolitanRegionofSaoPauloduetourbaneffects. Atmos. Res. 91 (2-4)13th International Conference on Atmo-spheric Electricity—ICAE 2007, pp. 485–490 . February 2009, ISSN 0169-8095, DOI: 10.1016/j.atmosres.2008.06.009.Fernandes,W.A.,Pinto,I.,PintoJr.,O.,Longo,K.,Freitas,S.R.,2006.Newfindingsabout the influence of smoke from fires on the cloud-to-ground lightningcharacteristics in the Amazon region. Geophys. Res. Lett. 33, L20810.Holben, B.N., et al., 1998. AERONET — a federated instrument network anddata archive for aerosol characterization. Rem. Sens. Env. 66 (1), 1–16.Jayaratne, E.R., Saunders, C.P.R., Hallett, J., 1983. Laboratory studies of thechargingofsofthailduringice crystals interacitons. Quart.J.RoyalMeteor.Soc. 109, 609.Kanamitsu, M., Ebisuzaki, W., Woollen, J., Yang, S.K., Hnilo, J.J., Fiorino, M.,Potter, G.L., 2002. NCEP — DOE AMIP-II reanalysis (R-2). Bull. Amer.Meteor. Soc. 83, 1631–1643.Kar, S.K., Liou, Y.A., Ha, K.J., 2009. Corrigendum to aerosol effects on theenhancement of cloud-to-ground lightning over major urban areas ofSouth Korea. Atmos. Res. (ISSN: 0169-8095) 92 (4), 540. doi:10.1016/j.atmosres.2008.09.040 June 2009.Naccarato, K.P., Pinto Jr., O., Pinto, I.R.C.A., 2003. Evidence of thermal andaerosol effects on the cloud-to-ground lightning density and polarityoverlargeurbanareasofSoutheasternBrazil.Geophys.Res.Lett.30(13),1674. doi:10.1029/2003GL017496.Oliveira, A.P., Dias, P.L., da, S., 1982. Aspectos observacionais da brisamaritima em Sao Paulo. II Congresso Brasileiro de Meteorologia. Pelotas.Anais do II Congresso Brasileiro de Meteorologia, pp. 129–161.Oliveira, A.P., Bonstein, R.D., Soares, K., 2003. Annual and diurnal windpatterns in the city of Sao Paulo. Water Air Soil Pollut.: Focus 3, 3–15.PereiraFilho,A.J.,2000.ChuvasdeveraoeasenchentesnaGrandeSaoPaulo:ElNino,brisamaritimaeilhadecalor.ISeminarioBrasileirodeHidrometeor-ologia, 2000, Rio de Janeiro. : XI Congresso Brasileiro de Meteorologia.Sociedade Brasileira de Meteorologia, Rio de Janeiro.PereiraFilho,A.J.,Haas,R.,2003.Hydrometeorologicalanalysisofflashfloodsintropical urban environments and their societal impacts. 7th InternationalConference on Southern Hemisphere Meteorology and Oceanography,2003, Wellington.: 7th International ConferenceonSouthernHemisphereMeteorology and Oceanography. AMS, Boston.Rosenfeld, D., Lensky, I.M., 1998. Satellite-based insights into precipitationformation processes in continental andmaritimeconvectiveclouds. Bull.Am. Met. Soc. 79, 2457–2476.Rosenfeld, D., 2000. Suppression of rain and snow by urban and industrial airpollution. Science 287, 1793–1796.Shepherd, J.M., Pierce, H., Negri, A.J., 2002. Rainfall modification by majorurban areas: observations from spaceborne rain radar on the TRMMsatellite. J. Appl. Meteor. 41, 689–701.Sherwood, S.C., 2002. Aerosols and ice particle size in tropical cumulonim-bus. J. Climate 15, 1051–1063.Steiger, S.M., Orville, R.E., Huffines, G., 2002. Cloud-to-ground lightningcharacteristics over Houston, Texas: 1989–2000. J. Geophys. Res. 107(D11), 4117. doi:10.1029/2001JD001142.Sugahara,S.,DaRocha,R.P.,Silveira,R., 2008.Non-stationaryfrequencyanalysisofextreme daily rainfall in Sao Paulo. Brazil. Int. J. of Climatol.. doi:10.1002/joc.1760Wilks, D.S., 2006. Statistical Methods in the Atmospheric Sciences. Elsevier.627pp.Williams, E., Rosenfeld, D., Madden, N., Gerlach, J., Gears, N., Atkinson, L.,Dunnemann,N.,Frostrom,G.,Antonio,M.,Biazon,B.,Camargo,R.,Franca,H., Gomes, A., Lima, L., Machado, R., Manhaes, S., Nachtigall, L., Piva, H.,Quintiliano, W., Machado, L., Artaxo, P., Roberts, G., Renno, N., Blakeslee,R., Bailey, J., Boccippio, D., Betts, A., Wolff, D., Roy, B., Halverson, J.,Rickenbach, T., Fuentes, J., Avelino, E., 2002. Contrasting convectiveregimes over the Amazon: implications for cloud electrification. J.Geophys. Res. 107 (D20), 8082. doi:10.1029/2001JD000380.488 C.A. Morales Rodriguez et al. / Atmospheric Research 96 (2010) 477–488