Radiative Transfer In The Atmosphere
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Reanálise CFSR-NCEP aplicada ao modelo SiB2 na simulação de fluxos de CO2 sobre o cultivo de soja em Cruz Alta.
The present work aimed to evaluate the behavior of CO2 fluxes, run by the Simple Biosphere Model (SiB2), by adopting CFSR-NCEP data reanalyzed as an atmospheric boundary condition. A statistical analysis was used in order to validate the results obtained using a coefficient for the adjusted model based on the simulation parameters when compared to the data o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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2. Radiative transfer model for regular and discontinuous canopies (GRART): application in tree coffee canopies / Modelo de transferência radiativa para dosséis descontínuos regulares (GRART): aplicação para dosséis de café
Regularly displaced discontinuous plant stands such as coffee tree stands, citrus orchards, eucalyptus forests and annual crops at the beginning of their phenological cycle (row structured) are known as highly anisotropic remote sensing targets. Operational parameter estimate upon this kind of remote sensing targets requires a physically-based canopy reflect
Publicado em: 2008
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3. Modelo de regiões ativas em rádio freqüências / Model of active regions at radio frequencies
The goal of this work is to model in 3-D the solar atmosphere over active regions in order to reproduce the emission of these regions at radio frequencies. The model computes the radiative transfer equations for the thermal bremsstrahlung and gyro-resonance emission mechanisms. Because there are no measurements of magnetic fields intensities in the higher so
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/06/2007
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4. Estudos espectroscópicos de vidros sódio aluminofosfatos co-dopados com Yb3+ e Tm3+ / Spectroscopic studies of glasses sodium aluminophosphatos co-dopad with Yb3+ and Tm3+
This work presents a throughout near-infrared and visible spectroscopic characterization of two sets of Yb3+ and Tm3+ codoped sodium aluminophosphate glasses, prepared in nitrogen and ambient atmospheres. In these samples, the Yb3+ ions are employed as efficient sensitizers of 0.98 µm excitation, with subsequent energy transfer to Tm3+ ions. Results are dis
Publicado em: 2007
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5. Albedo of an Amazon tropical rainforest: field measurements, remote sensing, modeling, and its influence on the regional climate / Albedo de uma floresta tropical Amazônica: medições de campo, sensoriamento remoto, modelagem, e sua influência no clima regional
Albedo is defined as a ratio between reflected solar radiation and incoming solar radiation over a surface. It is a main factor that affects the terrestrial radiation balance and has been frequently considered in the global and regional climate studies. Amazon is one of planets regions where the response of regional atmospheric circulation is more intense. S
Publicado em: 2006
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6. 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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7. Using HSB sensor to retrieval precipitable water and rainfall / Um estudo sobre o uso do sensor HSB na estimativa da água precipitável e da precipitação
This work exploits the capability of the Humidity Sensor Brazil (HSB) channel in retrieving Integrated Water Vapor Content and estimating precipitation. The data analyses of this study have been carried out in two stages: firstly using simulations of the HSB channel brightness temperatures from RTTOV and Kummerow radiative models, and secondly, using data fr
Publicado em: 2004
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8. O Efeito de Partículas de Aerossol de Queimadas da Amazônia no Balanço Radiativo da Atmosfera / The Effect of Aerosol Particle Burning of the Amazon in radiative balance of the atmosphere
Medidas in situ na Bacia Amazônica mostraram uma grande variedade de partículas de aerossol provenientes principalmente de fontes biogênicas e de queimadas. Partículas de queimadas foram estudadas em detalhe e são compostas de misturas de partículas esféricas e não esféricas, e aglomerados de até milhares de esferas nanométricas de \"black carbon\
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/08/1999
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9. Inferencia de perfis verticais de temperatura utilizando uma tecnica interativa implicita de inversao / Retrieval of vertical temperature profiles in the atmosphere using an interative implicit inversion technique
In this work, we present an iterative implicit inversion method (MIII) to retrieve vertical temperature profiles based on the mathematical inversion of the radiative transfer equation (RTE). The inverse problem is formulated as a nonlinear constrained optimization problem. A regularization term is added to the objective function with the help of a Lagrange m
Publicado em: 1998
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10. Imagery correction for atmospheric effects using sounding data / Correção de uma imagem para os efeitos atmosféricos utilizando dados de radiossonda
The upwelling radiation received by a sensor has three distinct components: target radiation directly transmitted through the atmosphere, diffuse radiation from the background and the diffuse atmospheric radiation. The sum of the last two components is called path radiance, whose effects reduce the spatial and spectral variability of the image. So, in order
Publicado em: 1992
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11. Estudos dos efeitos atmosfericos sobre as radiacoes percebidas pelos sensores a bordo de plataformas orbitais (ERTS/LANDSAT) / Studies of atmospheric effects over radiations perceived by the radar on board an orbital platforms (ERTS/LANDSAT)
The solar radiation reflected by targets on the earth s surface interacts with the atmosphere before being detected by the satellite sensors. In the visible wavelenght region, scattering by molecules and aerosols predominates on the interaction of the radiation with the atmosphere. In addition to attenuation, this interaction also contributes with diffuse ra
Publicado em: 1978