Surface albedo in different land-use and cover types in Amazon forest region – ScienceOpen
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      Surface albedo in different land-use and cover types in Amazon forest region Translated title: Albedo de superfície em diferentes classes de uso e cobertura do solo em região de floresta amazônica

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          Abstract

          Abstract Albedo is the portion of energy from the Sun that is reflected by the earth's surface, thus being an important variable that controls climate and energy processes on Earth. Surface albedo is directly related to the characteristics of the Earth’s surface materials, making it a useful parameter to evaluate the effects of original soil cover replacement due to human occupation. This study evaluated the changes in the surface albedo values due to the conversion of vegetation to other land uses and to analyze the applicability of the use of albedo in the spatial delimitation of land-use classes in the transitional region between the Cerrado and Amazon biomes. Surface albedo measurements were obtained from processing of Landsat Thematic Mapper data in the Geographic Information System (GIS), and land-use information were collected using Google Earth high-resolution images. The results show that human activities such as the cultivation of crops and burning have contributed substantially to variations in the surface albedo, and that albedo estimates from Landsat imagery have the potential to help in the recognition and delimitation of features of land use and cover.

          Translated abstract

          Resumo Albedo é a porção de energia solar refletida pela superfície terrestre, sendo assim, uma importante variável que controla os processos climáticos e energéticos sobre a Terra. Albedo da superfície está diretamente relacionado com as características dos materiais da superfície da Terra, tornando-se um parâmetro útil para avaliar os efeitos da substituição de cobertura do solo original devido à ocupação humana. Este estudo objetivou avaliar as alterações nos valores de albedo da superfície em função da conversão da vegetação em outras formas de uso do solo, e analisar a aplicabilidade do uso do albedo na delimitação espacial de classes de uso do solo em região de transição entre os biomas Cerrado e Amazônia. As medidas de albedo da superfície foram obtidas a partir de processamento de dados Landsat Thematic Mapper em sistema SIG e as informações de uso do solo foram obtidas usando imagem de alta resolução do Google Earth. Os resultados demonstram que ações antrópicas sobre a superfície, como desenvolvimento de lavouras e queimadas contribuem substancialmente para as mudanças no albedo de superfície, e que as estimativas de albedo a partir de imagens Landsat apresentam potencial para auxiliar na identificação e delimitação de feições de uso e cobertura do solo.

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          Modelling conservation in the Amazon basin.

          Expansion of the cattle and soy industries in the Amazon basin has increased deforestation rates and will soon push all-weather highways into the region's core. In the face of this growing pressure, a comprehensive conservation strategy for the Amazon basin should protect its watersheds, the full range of species and ecosystem diversity, and the stability of regional climates. Here we report that protected areas in the Amazon basin--the central feature of prevailing conservation approaches--are an important but insufficient component of this strategy, based on policy-sensitive simulations of future deforestation. By 2050, current trends in agricultural expansion will eliminate a total of 40% of Amazon forests, including at least two-thirds of the forest cover of six major watersheds and 12 ecoregions, releasing 32 +/- 8 Pg of carbon to the atmosphere. One-quarter of the 382 mammalian species examined will lose more than 40% of the forest within their Amazon ranges. Although an expanded and enforced network of protected areas could avoid as much as one-third of this projected forest loss, conservation on private lands is also essential. Expanding market pressures for sound land management and prevention of forest clearing on lands unsuitable for agriculture are critical ingredients of a strategy for comprehensive conservation.
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            Biogeophysical effects of land use on climate: Model simulations of radiative forcing and large-scale temperature change

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              Effects of Amazon and Central Brazil deforestation scenarios on the duration of the dry season in the arc of deforestation

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                ambiagua
                Revista Ambiente & Água
                Rev. Ambient. Água
                Instituto de Pesquisas Ambientais em Bacias Hidrográficas (Taubaté, SP, Brazil )
                1980-993X
                April 2018
                : 13
                : 2
                : e2120
                Affiliations
                [1] Cuiabá Mato Grosso orgnameUniversidade Federal de Mato Grosso orgdiv1Programa de Pós-Graduação em Física Ambiental Brazil thiagofaria@ 123456ufmt.br
                [2] Campo Grande orgnameUniversidade Federal do Mato Grosso do Sul orgdiv1Laboratório de Ciências Atmosféricas Brazil thiago.r.rodrigues@ 123456ufms.br
                Article
                S1980-993X2018000200300
                10.4136/ambi-agua.2120
                0a0d6a71-421a-492d-a4a2-1f8c535632f7

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 04 April 2017
                : 20 January 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 41, Pages: 0
                Product

                SciELO Brazil

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                Articles

                reflectância,remote sensing.,reflectance,Landsat 5,sensoriamento remoto.

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