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  •  Arquivos 2008 - Divisão de Impactos, Adaptação e Vulnerabilidades Ir direto para menu de acessibilidade.
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    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...
    • por Portal Padrão
    • publicado
    • 23/08/2008
    • 3:44 PM

    Positive leader characteristics from high-speed video observations

    Based on analyses of high-speed video recordings of cloud-to-ground lightning in Brazil and the USA, the characteristics of positive cloud-to-ground (+CG) leaders are presented. The high frame rates permitted the average, 2-dimensional speeds of development along the paths of the channels to be reso...
    • por Portal Padrão
    • publicado
    • 23/08/2008
    • 3:43 PM

    On the sensitivity of cloud-to-ground lightning activity to surface air temperature changes at different time scales in São Paulo, Brazil

    This paper presents a study about the sensitivity of cloud-to-ground (CG) lightning activity to changes in surface air temperature at daily, monthly, yearly, and decadal timescales in the city of São Paulo (Brazil). Lightning data collected in the city by the Brazilian Lightning Detection Network (...
    • por Portal Padrão
    • publicado
    • 23/08/2008
    • 3:42 PM

    First versus subsequent return-stroke current and field peaks in negative cloud-to-ground lightning discharges

    We examine relative magnitudes of electric field peaks of first and subsequent return strokes in negative cloud-to-ground lightning flashes recorded in Florida, Austria, Brazil, and Sweden. On average, the electric field peak of the first stroke is appreciably, 1.7 to 2.4 times, larger than the fiel...
    • por Portal Padrão
    • publicado
    • 23/08/2008
    • 3:41 PM

    Relatório de Desenvolvimento Humano 2007/2008

    O modo como actuamos hoje relativamente às alterações climáticas acarreta consequências que perdurarão um século ou mais. Num futuro próximo, o resultado das emissões de gases com efeito de estufa não será reversível. Os gases retentores de calor emitidos em 2008 irão permanecer na atmo...
    • por Portal Padrão
    • publicado
    • 26/01/2008
    • 3:10 PM