Temporal downscaling: a comparison between artificial neural network and autocorrelation techniques: Part II- application
Several studies have been devoted to dynamic and statistical downscaling for both climate variability and climate change. This paper introduces an application of temporal neural networks for downscaling global climate model output and autocorrelation functions. This method is proposed for downscalin...
por Portal Padrão
publicado
26/08/2009
1:27 PM
Validação do Albedo da superfície terrestre obtido a partir de imagens do sensor Modis em área de Caatinga
O albedo da superfície, definido como a razão entre a radiação solar refletida e a radiação solar incidente, é uma medida indireta da energia solar absorvida pela superfície. É um importante parâmetro que afeta o balanço de radiação terrestre e, portanto, é considerado em estudos do cl...
por Portal Padrão
publicado
26/08/2009
1:26 PM
Calibration of the “simplified simple biosphere model-SSiB” for the Brazilian Northeast Caatinga
Brazilian Northeast region is covered largely by vegetation adapted to the arid conditions and with varied physiognomy, called caatinga. It occupies an extension of about 800.000 km that corresponds to 70% of the region. In recent decades, considerable progress in understanding the micrometeorologic...
por Portal Padrão
publicado
26/08/2009
1:25 PM
Solar radiation assessed by CPTEC model GL: a comparison between results with GOES and MSG over Northeastern Brazil
Model GL version 1.2 runs operationally at CPTEC/INPE assessing daily solar radiation from GOES 10 VIS imagery. Besides basic hypotheses about atmospheric variables, the fundamental local variable is reflectance at a pixel observed by satellite (Ceballos et al. 2004). Daily irradiation is obtained b...
por Portal Padrão
publicado
26/08/2009
1:24 PM
Modelling of the decrease of tropical-forest resilience in Amazonia as affected by deforestation and fires
Biome models of the global climate-vegetation relationships indicate that most of the Brazilian Amazon has potential for being covered by tropical forests. From current land-use processes observed in the region, however, several areas of natural forests were lead to different states dominated by deg...
por Portal Padrão
publicado
26/08/2009
1:23 PM
Potential for advancing fire research in Amazonia by integrating ground-based, remote sensing and modeling studies for the region
Fire research is key for understanding the ecosystem functions of Amazonia and the sustainability of land-use practices in the region. Fires are significant disturbances to biogeochemical cycles, and have important links to land use and climate. Major methods for studying fires include fieldwork, re...
por Portal Padrão
publicado
26/08/2009
1:22 PM
An architecture for agent-based modelling and simulation of geospatial phenomena
This work presents a general architecture for building and simulating agent-based models that use real-world geospatial data, take into account all the ways geospatial data can feed these models. We focus on how data can be used to create an initial arrangement for the model, as if it was a static r...
por Portal Padrão
publicado
26/08/2009
1:21 PM
Large-scale changes in precipitation and temperature in South America under climate change – ensemble climate model projections and uncertainty assessments
Following the extensive conclusions from the IPCC (Intergovernmental Panel on Climate Change) Fourth Assessment Report and other reports (including INPEs report 2007 - ww.cptec.inpe.br/mudancas_climaticas) we have credible evidence that the climate is changing across the world. But it is important t...
por Portal Padrão
publicado
26/08/2009
1:20 PM
Land change modeling and institutional factors: heterogeneous rules of territory use in the Brazilian Amazonia
Land changes are determined by a complex web of biophysical and socio-economic factors that interact in time and space, in different historical and geographical contexts, creating different trajectories of change. It is peopleís response to economic opportunities mediated by institutional factors t...
por Portal Padrão
publicado
23/08/2008
3:46 PM
Spatial relations across scales in land change models
Land changes are the result of a complex web of interaction between human and biophysical factors, which act over a wide range of temporal and spatial scales. In this paper we conceptualize spatial relations among geographic objects at different scales. We analyze two types of spatial relations: hie...
por Portal Padrão
publicado
23/08/2008
3:45 PM
Improving downscaling: South America Rainfall
However the spatial resolution of GCMs remains quite coarse , in the order of 300 x 300 km, and at scale , the regional and local details of the climate which are influenced by spatial heterogeneities in the regional physiography are lost. Therefore, there is the need to convert the GCM outputs into...
por Portal Padrão
publicado
23/08/2008
3:44 PM
Measuring projections of climate change skill: South America precipitation using IPCC models
As Histoty embraces the beginning of a new millennium, old problem still constitute enormous challenges to the popoulation in general, and to the academic world in particular. It is now widely accepted that General Circulation Models (CCMs) represent the most satisfactory technique to answer these c...
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