@Article{SilvaFrei:2015:ImMeDi,
               author = "Silva, Cl{\'a}udio Mois{\'e}s Santos e and Freitas, Saulo 
                         Ribeiro de",
          affiliation = "{Universidade Federal do Rio Grande do Norte (UFRN)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Impacto de um mecanismo de disparo da convec{\c{c}}{\~a}o na 
                         precipita{\c{c}}{\~a}o simulada com o modelo regional BRAMS 
                         sobre a bacia amaz{\^o}nica durante a esta{\c{c}}{\~a}o chuvosa 
                         de 1999",
              journal = "Revista Brasileira de Meteorologia",
                 year = "2015",
               volume = "30",
               number = "2",
                pages = "145--157",
                month = "jun.",
             keywords = "parametriza{\c{c}}{\~a}o, ciclo di{\'a}rio, CAPE, 
                         parameterization, diurnal cycle, CAPE.",
             abstract = "O objetivo deste artigo {\'e} mostrar o impacto da 
                         implementa{\c{c}}{\~a}o de uma fun{\c{c}}{\~a}o de disparo da 
                         convec{\c{c}}{\~a}o na parametriza{\c{c}}{\~a}o convectiva de 
                         Grell e Devenyi, contida no modelo atmosf{\'e}rico regional BRAMS 
                         (Brazilian developments on Regional Atmospheric Model). Para 
                         verificar o ciclo de precipita{\c{c}}{\~a}o foi usado um 
                         conjunto de dados do per{\'{\i}}odo chuvoso de 1999 no 
                         {\^a}mbito do projetoLarge scale Biosphere-Atmosphere Experiment 
                         in Amazonia(LBA). A nova fun{\c{c}}{\~a}o de disparo de 
                         convec{\c{c}}{\~a}o {\'e} acoplada aos fluxos de calor 
                         sens{\'{\i}}vel e latente {\`a} superf{\'{\i}}cie. Al{\'e}m 
                         disso, possui a vantagem de considerar a m{\'e}dia dos primeiros 
                         60 hPa da troposfera para caracterizar a ascen{\c{c}}{\~a}o 
                         pseudo adiab{\'a}tica da parcela. Assim, a parcela em 
                         ascen{\c{c}}{\~a}o apresenta redu{\c{c}}{\~a}o daConvective 
                         Available Potential Energy (CAPE), o modelo acumula menos CAPE nas 
                         primeiras horas do dia e com isso, o m{\'a}ximo de 
                         precipita{\c{c}}{\~a}o {\'e} atrasado (embora dependa da 
                         regi{\~a}o analisada). Um aspecto negativo foi que a 
                         precipita{\c{c}}{\~a}o sobre a Cordilheira dos Andes aumentou 
                         relativamente {\`a} vers{\~a}o original. Conclui-se que o 
                         esquema apresenta vantagens e desvantagens e que faz-se 
                         necess{\'a}rio avaliar outras parametriza{\c{c}}{\~o}es do 
                         modelo, principalmente a troca de energia e massa na interface 
                         solo-vegeta{\c{c}}{\~a}o-atmosfera a fim de se obter resultados 
                         mais real{\'{\i}}sticos da precipita{\c{c}}{\~a}o sobe a 
                         Amaz{\^o}nia. ABSTRACT: The purpose of the present paper is to 
                         show the impact of implementing a convecitve trigger function in 
                         the Grell and Devenyi cumulusparameterization on the BRAMS 
                         (Brazilian developments on Regional Atmospheric Model) 
                         simulations. A dataset colected during the 1999 rainy season in 
                         the Large Scale Biosphere-Atmosphere Experiment in Amazonia (LBA) 
                         project was used to evaluate the diurnal cycle of observed 
                         precipitation. The new convective trigger function is coupled to 
                         the surface sensible and latent heat fluxes. In addition, the 
                         method has the advantage of considering the average of the first 
                         60 hPa lowest tropospheric levels to characterize the ascending 
                         pseudo adiabatically parcel. Thus, the Convective Available 
                         Potential Energy (CAPE) values are reduced delaying the maximum 
                         rainfall (although it is region dependent). A negative aspect is 
                         that precipitation is overestimation over the Andes relativelly to 
                         the original version model. It is concluded that the methodology 
                         presents advantages and disadvantages, thus evaluating other 
                         parameterizations is required, specially the 
                         soil-vegetation-atmosphere mass and energy exchabges in order to 
                         obtain more realistic simulated precipitation values over the 
                         Amazon Basin.",
                  doi = "10.1590/0102-778620140039",
                  url = "http://dx.doi.org/10.1590/0102-778620140039",
                 issn = "0102-7786",
             language = "en",
           targetfile = "santos_impacto.pdf",
        urlaccessdate = "27 abr. 2024"
}