Navegando por Assunto "BRAMS"

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Acesso aberto (Open Access)
Complexo Convectivo de Mesoescala observado em 27/11/2002 no nordeste da Argentina
(2008-12) CAMPOS, Claudia Rejane Jacondino; LIMA, Edna Cristina Sodré; PINTO, Luciana Barros
In this work were analyzed the synoptic situations associated to a Mesoscale Convective Complex (CCM), observed on 11/27/2002 in the northeast of Argentina. Infrared imagery from GOES-8 and simulations from BRAMS regional model were used. The model simulation, with three hours issues, allowed detailing the behavior of the meteorological variables in large scale that affect the MCC life cycle, being able to reproduce the suitable conditions to its beginning, development and dissipation. The results showed that the MCC studied presented similar characteristics to those observed by several authors.
Acesso aberto (Open Access)
Insights of meso and micro-scale processes for the Caxiuanã forest region from high resolution simulation
(2012-07) MESQUITA, Renata Leitão da Conceição; SILVA, Renato Ramos da
Meteorological data and high resolution numerical simulations were used to estimate spatial fields in eastern Amazonia where is located the Forest and the Bay of Caxiuanã. The study were performed for the period of November 2006, when occurred the field experiment COBRA-PARA. Analysis of the MODIS sensor from the Terra Satellite images show the occurrence of various phenomena such as local cloud streets, precipitating convective systems and an important influence of the interfaces between the forest and water surfaces. Numerical simulations for November 7, 2006 showed that the model represented well the major meteorological processes. The results show that the Caxiuanã Bay causes significant impact on adjacent meteorological fields mainly through advection by the northeast winds that induce to colder canopy temperature to the west of the bay and convective rainfall. Simulations with high resolution (LES) produced spatial patterns of temperature and humidity aligned with the winds during the daytime, and at nighttime the patterns are influenced mainly by the presence of the bay. Correlations between the mid-level winds and the latent heat fluxes showed that there is a change from negative correlations for the early hours to positive correlations for the afternoon and early evening.
Acesso aberto (Open Access)
Simulações de ondas de gravidade na camada limite noturna amazônica e sua influência nas trocas de ozônio e monóxido de carbono.
(Universidade Federal do Pará, 2020-06-30) MORAES, Eiky Tatsuya Ishikawa de; DIAS JÚNIOR, Cléo Quaresma; http://lattes.cnpq.br/9857237626091379; https://orcid.org/0000-0003-4783-4689; COHEN, Júlia Clarinda Paiva; http://lattes.cnpq.br/0293299378753887; https://orcid.org/0000-0003-2048-8915
The main objective of this work is to investigate the influence of topography on the generation of gravity waves (OGs) and their consequent implications on gas transport between different parts of the atmosphere, at night, at the ATTO (Amazon Tall Tower Observatory) experimental site, in the municipality of São Sebastião de Uatumã-AM, in the central region of the Amazon. The experimental data was collected at the ATTO site in the Instant tower of 81 m height. To reach the results, we used Morlet's wavelet transform method, image from the GOES-13 satellite in the infrared band, reanalysis from the ECMWF Era-Interim (European Centre for Medium-Range Weather Forecasts) and numerical simulations of the mesoscale model BRAMS (Brazilian Regional Atmospheric Modeling System) version 5.3. Firstly, an occurrence of OG on the night of the 12th to the 13th of November 2015, through the analysis via wavelet transform. Satellite images showed that rain events did not occur on the night in question, which allowed the annulment of the possibility that the OG had a convective origin. The ECMWF Era-Interim reanalysis were then used, and wave signals were also identified in the air temperature, vertical component of the wind and gases such as CO and O3. Two experiments were then simulated in the JULES-CCATT-BRAMS model, one with the real topography of the region (SC) and the other with the removal of the topography (ST). The simulations results showed up that the presence of the topography intensifies the OG action in air temperature oscillations, in the movement of vertical wind components and in air floatage. Furthermore, the wave transported O3 and CO from burn regions to the ATTO site, a fact that is not significantly observed in ST simulation. Lastly, the simulations proved that the topography had a relevant role in the generation and intensification of OG and its actions in scalars transport near the surface.