@InProceedings{RagaPozoTorrNico:2006:ThStIm,
               author = "Raga, G. B. and Pozo, D. and Torres-Brizuela, M. and Nicolini, 
                         M.",
          affiliation = "Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma 
                         de Mexico, Ciudad Universitaria, Mexico DF 04510, Mexico (Raga, 
                         Pozo) and Centro de Investigaciones del Mar y de la Atmosfera y 
                         Departamento de Ciencias de la Atmosfera y de los Oceanos, 
                         Universidad de Buenos Aires, 2do Piso Pabellon II, Ciudad 
                         Universitaria, Capital Federal 1428, Argentina (Torres-Brizuela, 
                         Nicolini) and {}",
                title = "A theoretical study of the impact of biomass-burning CCN on the 
                         dynamics of deep convective clouds with mixed phase",
            booktitle = "Proceedings...",
                 year = "2006",
               editor = "Vera, Carolina and Nobre, Carlos",
                pages = "683--688",
         organization = "International Conference on Southern Hemisphere Meteorology and 
                         Oceanography, 8. (ICSHMO).",
            publisher = "American Meteorological Society (AMS)",
              address = "45 Beacon Hill Road, Boston, MA, USA",
             keywords = "Biomass burning, deep convection, autoconversion, accretion, cloud 
                         dynamics.",
             abstract = "Clouds are important components of the climate system as they 
                         affect the Earth's albedo and they participate in the hydrological 
                         cycle. One of the largest uncertainties in climate modelling is 
                         related to the parameterization of convective processes and, in 
                         particular, the question of how anthropogenic emissions may affect 
                         the different types of clouds is still open. Most research has 
                         been devoted to warm stratocumulus clouds, and only recently some 
                         studies incoporate changes in cirrus and mixed phase clouds. 
                         Emissions of gases and particles during biomass burning may affect 
                         the microphysics and dynamics of clouds developingnear and 
                         downwind of said emissions, and some studies have suggested that 
                         precipitation may be inhibited. Nevertheless, there have not been 
                         many studies that explore the effect that cloud condensation 
                         nuclei (CCN) originated by biomass burning may have on deep 
                         convective clouds, in which the ice phase is dominant. In this 
                         study we have introduced changes in the parameterization of the 
                         autoconversion and accretion processes in the Advanced Regional 
                         Prediction System (ARPS, developed at the Center for the Analysis 
                         and Prediction of Storm at the University of Oklahoma). The CCN 
                         used in the model were obtained from literature, and correspond to 
                         experimental studies in the Amazonia/Rondonia regions of recent 
                         and aged particles. ARPS was run on thermodynamic conditions 
                         representative of Northern Argentina during November, hundreds of 
                         kilometers away form the CCN sources. The results suggest that 
                         when the atmospheric conditions are very unstable (leading to very 
                         deep convection, even in cases, to the occurrence of tornadoes), 
                         the autoconversion and accretion processes are not significant in 
                         changing the overall cloud dynamics, neither the total 
                         precipitation at the surface. These results indicate that the 
                         dynamics of the deep, mixed phase clouds simulated is not 
                         sensitive to the input of large concentrations of CCN originated 
                         during biomass burning. We are currently exploring the impact of 
                         introducing large concentrations of ice nuclei (IN), introducing 
                         changes in the parameterizations of the ice phase in ARPS.",
  conference-location = "Foz do Igua{\c{c}}u",
      conference-year = "24-28 Apr. 2006",
             language = "en",
         organisation = "American Meteorological Society (AMS)",
                  ibi = "cptec.inpe.br/adm_conf/2005/10.24.14.22",
                  url = "http://urlib.net/ibi/cptec.inpe.br/adm_conf/2005/10.24.14.22",
           targetfile = "683-688.pdf",
                 type = "Human influences on climate",
        urlaccessdate = "27 abr. 2024"
}