Wet Fluxes
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Hourly interaction between wind speed and energy fluxes in Brazilian Wetlands - Mato Grosso - Brazil
ABSTRACT Matter and energy flux dynamics of wetlands are important to understand environmental processes that govern biosphere-atmosphere interactions across ecosystems. This study presents analyses about hourly interaction between wind speed and energy fluxes in Brazilian Wetlands - Mato Grosso - Brazil. This study was conducted in Private Reserve of Natura
An. Acad. Bras. Ciênc.. Publicado em: 01/12/2016
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2. Levantamento dos níveis de radioatividade natural em águas do alto Vale do Ribeira à planície costeira do litoral sul do Estado de São Paulo / Assessment of natural radioctivity levels in waters from Higher Ribeira Valley until the southern Sao Paulo State coastal plain
The complex exchange of fluvial, subsurface and seawater within a coastal area directly affects global biogeochemical cycles and the application of isotopic tracers, mainly natural radionuclides from U and Th series, is a powerful tool to track sources and sinks of trace elements and nutrients to this systems. The unique Ra signature applied to quantify the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/11/2010
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3. VARIAÇÃO SAZONAL DA ACUMULAÇÃO E FLUXO NOTURNOS DE ESCALARES EM UMA PASTAGEM NA REGIÃO AMAZÔNICA / SEASONAL VARIATION OF SCALAR NOCTURNAL ACCUMULATION AND FLUXES OVER A PASTURE IN AMAZONIA
Carbon dioxide and Radon nocturnal vertical accumulations over a pasture site at the Amazon region are investigated. The site is characterized by a strong thermal stability along the night, which is responsible for suppressing a good portion of the local turbulent mixing. Therefore, it is problematic to use techniques such as the eddy covariance for estimati
Publicado em: 2010
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4. Study of the use of alternative fluxing agents to the feldspar in porcelainized stoneware tile compositions / Estudo da utilização de fundentes alternativos ao feldspato em composições de porcelanato
The porcelainized stoneware has been outstanding in the current market of ceramic tiles because it offers excellent technical and esthetic features. In this research traditional ceramic raw materials were selected and a standard formulation reported in the literature was adopted, aiming to replace the vitreous phase former (feldspar) from the composition by
Publicado em: 2010
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5. Composição isotópica e fluxos de CO2 em área de Cerrado (Parque Estadual de Vassununga, SP) / Isotopic composition and carbon dioxide fluxes in an area of Cerrado (State Park of Vassununga, SP)
The presente study was carreid out in area o Cerrado strictu senso located at the State Park of Vassununga, closed to the Santa Rita do Passa Quatro city, São Paulo State, Brazil. The aim was of the present work was to measure de CO2 fluxes released through respiration processes of the vegetation and soil (heterotrophic and autotrophic) to check the relativ
Publicado em: 2010
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6. Avaliação do impacto das condições hídricas do solo no início da estação chuvosa de 2004/2005 / Evaluation of the hydric soil conditions role on the 2004/2005 rainy season onset
Some studies have been showed that the surface heat fluxes are important to the monsoon system around the world. The importance of the soil moisture on seasonal forecasts has also been pointed out. Therefore, the influence of the soil moisture on the early stages of the South America (SA) monsoon system was the aim of this study. Moreover, it is aimed to kno
Publicado em: 2009
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7. Deposição atmosférica de espécies químicas em Ribeirão Preto, uma importante cidade canavieira do estado de São Paulo / Deposição atmosférica de espécies químicas em Ribeirão Preto, uma importante cidade canavieira do estado de São Paulo
Rain water samples were collected based on events at the University of São Paulo - campus Ribeirão Preto - from August 2002 to December 2005. About 84% (n=127) of the samples had excess of acidity, with an average pH of 5.12. There was no correlation between the pH values and the sugar cane harvest period. The Volume Weighed Means (VWM, in mol L-1) for K+
Publicado em: 2007
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8. Fatores que influem na emissão de CO2 e CH4 em áreas alagáveis interfluviais do médio Rio Negro
Wetlands in the Amazon basin have been shown to be a globally significant source of methane and carbon dioxide, important greenhouse gases. However interfluvial savanna wetlands of Negro River basin have not been characterized. Here we describe the hydrometeorology and their influence on emissions of CO2 and CH4 from these wetlands to improve regional emissi
Publicado em: 2007
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9. Composição química da chuva e aporte atmosférico na Ilha Grande, RJ
Wet (n = 21) and dry (n = 23) deposition samples were collected from March to September 2002 at the southern coast of Ilha Grande. Rainwater pH varied from 4.3 to 6.3 and ionic concentrations (in µmol L-1) decreased in the order Cl- > Na+ > Mg2+ > SO4(2-) > NO3- ~ NH4+ > K+ ~ H+ > Ca2+. Scavenging of sea-salt aerosols was the major source of Cl-, Na+, Mg2+,
Química Nova. Publicado em: 2006-06
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10. Fluxo do CO2 proveniente da respiração do solo em áreas de floresta nativa da Amazônia / CO2 flux from soil respiration in areas of native Amazon forest
Carbon dioxide is an important contributor to the greenhouse effect, and by extension, the global climate system as a whole; it is generated and consumed through the activities of terrestrial and aquatic microorganisms. Tropical forest CO2 fluxes at the soil-atmosphere interface depend on changes in the physical, chemical and biological characteristics of th
Publicado em: 2006
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11. DISSOLVED ORGANIC CARBON CONCENTRATIONS AND BALANCES IN TWO WATERSHEDS OF RONDÔNIA: COMPARASION BETWEEN FOREST AND PASTURE / "Concentrações e balanços de carbono orgânico dissolvido em duas bacias do Estado de Rondônia: uma comparação entre floresta e pastagem"
Dissolved Organic Carbon (DOC) is one of the main fractions of organic carbon exported in rivers and other flow paths in watersheds. In the Amazon, studies of DOC in waters focus mainly on the large basins of the central region, with few analyses of changes in its dynamics after the replacement of forests by pastures, one of the most important land use chang
Publicado em: 2006
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12. An analysis of surface fluxes and of the microclimate on cerrado, sugarcane and eucalyptus: implications for regional climate changes / Uma análise dos fluxos de superfície e do microclima sobre cerrado, cana-de-açúcar e eucalipto, com implicações para mudanças climáticas regionais
This work investigates potential regional scale temperature and precipitation changes in the São Paulo state, caused by land use changes. We analised micrometeorological measurements, in the period February 2005 to February 2006, over three different ecosystems (cerrado, sugar cane and eucalyptus plantation). The surface energy balances showed that over the
Publicado em: 2006