Dynamic Meteorology
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Assessment of Total Attenuation and Adaptive Scheme for Quality of Service Enhancement in Tropical Weather for Satellite Networks and 5G Applications in Nigeria
Abstract The dynamic weather condition is a major concern for optimum channel utilization in recent times, especially at higher frequencies with larger bandwidth for 5G applications. Over the years, rain-induced attenuation among the hydrometeors has been linked as the major cause of signal impairment especially at the frequency, f ≥ 10 GHz. However, when
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. The Long-Range Memory and the Fractal Dimension: a Case Study for Alcântara
ABSTRACT: This study aimed to analyze the time series behavior of the Southern Oscillation Index through techniques using Fast Fourier Transform, computing the autocorrelation function, and the calculation of the Hurst coefficient. The methodology of Hurst Exponent calculation uses different lags, which are computed in the time series of Southern Oscillation
J. Aerosp. Technol. Manag.. Publicado em: 24/08/2017
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3. Caracterização física e dinâmica de episódios de chuvas intensas nas regiões sul e sudeste do Brasil / Physical and dynamical characteristics of heavy rainfall episodes in southern and southeastern Brazil
The heavy rainfall events occurred in Southern and Southeastern Brazil between 1960 and 2004 are investigated. It is observed positive trends in the annual frequency of these events in both regions in this period of 45 years. The trend in Southern Brazil is more significant. The atmospheric environments associated with these events also are investigated, but
Publicado em: 2009
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4. Caracterização física e dinâmica de episódios de chuvas intensas nas regiões sul e sudeste do Brasil / Physical and dynamical characteristics of heavy rainfall episodes in southern and southeastern Brazil
Os eventos de chuva intensa ocorridos nas Regiões Sul e Sudeste do Brasil entre 1960 e 2004 são investigados. Dentro deste período de 45 anos verificou-se a existência de tendências positivas nas frequências anuais destes eventos nas duas regiões, sendo mais significativa na Região Sul. Os ambientes atmosféricos associados a estes eventos também s�
Publicado em: 2009
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5. ANÁLISE DA DINÂMICA DA ATENUAÇÃO POR CHUVAS EM REGIÕES TROPICAIS / DYNAMIC ANALYSIS OF RAIN ATTENUATION IN TROPICAL REGIONS
The main effect causing non-availability in radio communication systems operating in frequencies above 10GHz, is the rain attenuation, particularly the heavy convective rain that is predominant in tropical regions. This thesis presents a detailed study and modelling of the dynamics of rain attenuation in terrestrial links and earthspace links, based on data
Publicado em: 2008
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6. Inclusion of the momentum perturbation in the kain-fritsch cumulus parameterization scheme and impacts on a convective rain case / Inclusão da perturbação de momentum no esquema de parametrização de cumulus kain-fritsch e impactos sobre um caso de chuva convectiva
The objective of this work is to insert the vertical transport of momentum through the mass flux in the Kain-Fritsch convective parameterization scheme. The momentum fluxes were inserted in the KF scheme in a similar way to the existing heat fluxes. Experiments were accomplished in the two domains, one experiment with cloud updraft (FM1) and one experiment i
Publicado em: 2007
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7. Validation of heat fluxes over the tropical atlantic: CPTEC coupled ocean-atmosphere model and observations / Validação dos fluxos de calor sobre o atlântico tropical: modelo acoplado oceano-atmosfera do CPTEC e observações
The goal of this work is to infer the importance of surface heat fluxes, estimated by several methods, in the determination of the Sea Surface Temperature (SST) fields in the tropical Atlantic using a set of general circulation ocean model Modular Ocean Model 3 (MOM 3) simulations and a Centro de Previsão de Tempo e Estudos Climáticos (CPTEC) coupled ocean
Publicado em: 2005
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8. Efeitos Inter-Hemisfericos de intensas fontes tropicais de calor / Inter-Hemispheric effects of strong tropical heat sources
The response over South America of the latent heat release in a strong perturbation (hurricane) moving over North Tropical Atlantic Ocean is investigated using a nonlinear semi-Lagrangian two layer primitive equation model. The model results show that such a perturbation propitiates a coupling with frontal system in the Southern Hemisphere and the convective
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/05/1991
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9. Um estudo observacional da formacao e trajetorias de anticiclones extratropicais na America do Sul / An observacional study of the extratropical anticyclones in the South American continent
O presente estudo consiste em uma estatistica de onze anos de trajetorias e anticiclogeneses para os anticiclones fracos e moderados (1979 a 1989) e de trinta e oito anos (1953 a 1990) para os anticiclones intensos (cuja pressao media da trajetoria foi maior ou igual a 1030 hPa), utilizando cartas sinoticas das 12 CUT. A area estudada foi regiao continental
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/1991
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10. Efeitos Inter-Hemisfericos de intensas fontes tropicais de calor / Inter-Hemispheric effects of strong tropical heat sources
A resposta sobre a America do Sul a uma intensa perturbacao que se move sobre o Oceano Atlantico Tropical Norte (com liberacao de calor latente comparavel aquela associada a furacoes) e investigada usando um modelo nao-linear semilagrangino de equacoes primitivas de duas camadas. Os resultados do modelo evidenciam um possivel acoplamento com sistemas frontai
Publicado em: 1991
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11. Um estudo observacional da formacao e trajetorias de anticiclones extratropicais na America do Sul / An observacional study of the extratropical anticyclones in the South American continent
O presente estudo consiste em uma estatistica de onze anos de trajetorias e anticiclogeneses para os anticiclones fracos e moderados (1979 a 1989) e de trinta e oito anos (1953 a 1990) para os anticiclones intensos (cuja pressao media da trajetoria foi maior ou igual a 1030 hPa), utilizando cartas sinoticas das 12 CUT. A area estudada foi regiao continental
Publicado em: 1991
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12. Um estudo observacional da formacao e trajetorias de anticiclones extratropicais na America do Sul / An observacional study of the extratropical anticyclones in the South American continent
In this study, South American extratropical anticyclones have been studied in the period between 1979 and 1989 for the weak and moderate ones and between 1953 and 1990 for the most intense ones (in which average pressure was greater or equal to 1030 hPa) by using daily synoptic charts. The main goal of this work was to show the tracks of the anticyclones and
Publicado em: 1991