@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 jun. 2024"
}