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Comparação termodinâmica e ambiental (emissões de CO2) das rotas de produção e utilização de combustíveis veiculares derivados de petróleo e gás natural, biocombustíveis, hidrogênio e eletricidade (veículos elétricos).; Thermodynamics and environmental comparison (CO2 emissions) of production and end use routes of vehicle fuels, derived from petroleum, natural gas, biofuels, hydrogen and electricity (electric vehicles).

Flórez-Orrego, Daniel Alexander
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 21/02/2014 PT
Relevância na Pesquisa
66.49%
O setor de transporte é um exemplo de atividade econômica que depende fundamentalmente das cadeias produtivas do petróleo, gás natural e biocombustíveis para sua operação, além de ser um dos principais consumidores da energia primária do país. Portanto, qualquer melhoria nos processos de produção e uso final dos combustíveis veiculares, repercute favoravelmente tanto na utilização dos recursos energéticos e o desempenho do setor, quanto no impacto ambiental e na economia nacional. Nesse sentido, faz-se necessário o desenvolvimento de uma metodologia que permita avaliar as diferentes rotas de produção e uso final, para determinar as principais fontes de degradação da energia e quantificar o impacto ambiental por meio de uma ferramenta apropriada. Uma valiosa ferramenta é a análise exergética ampliada, a qual provê uma oportunidade de quantificar os requerimentos exergéticos totais e não renováveis e as eficiências globais e, desse modo, perseguir e priorizar o uso daquelas fontes de energia mais favoráveis e amigáveis com o meio ambiente. A exergoeconomia, que visa à distribuição racional dos custos exergéticos entre os diversos produtos de uma mesma planta, usa a quantidade de exergia de cada produto como base para a distribuição da exergia despendida no respectivo processo. Desta forma...

Biodiesel CO2 emissions: A comparison with the main fuels in the Brazilian market

Coronado, Christian Rodriguez; de Carvalho, Joao Andrade; Silveira, Jose Luz
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 204-211
ENG
Relevância na Pesquisa
56.63%
The use of biodiesel is increasing as an attractive fuel due to the depleting fossil fuel resources and environmental degradation. This paper presents results of an investigation on the potentials of biodiesel as an alternative fuel and main substitute of diesel oil, comparing the CO2 emissions of the main fuels in the Brazilian market with those of biodiesel, in pure form or blended in different proportions with diesel oil (2%, 5%, and 20%, called B2, B5, and B20, respectively). The results of the study are shown in ton CO2 per m(3) and ton CO2 per year of fuel. The fuels were analyzed considering their chemical composition, stoichiometric combustion parameters and mean consumption for a single vehicle. The fuels studied were: gasoline, diesel oil, anhydrous ethyl alcohol (anhydrous ethanol), and biodiesel from used frying oil and from soybean oil. For the case of biodiesel, its complete life cycle and the closed carbon cycle (photosynthesis) were considered. With data provided by the Brazilian Association of Automotive Vehicle Manufacturers (ANFAVEA) for the number of vehicles produced in Brazil, the emissions of CO2 for the national fleet in 2007 were obtained per type of fuel. With data provided by the Brazilian Department of Transit (DENATRAN) concerning the number of diesel vehicles in the last five years in Brazil...

Portuguese industry and the EU trade emissions directive: development and analysis of CO2 emission scenarios

Borrego, C.; Martins, H.; Lopes, M.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
56.64%
In December 1997, the Kyoto Protocol was adopted, setting limits on the greenhouse gas (GHG) emissions of industrialized countries. The European Union agreed to reduce its emissions of GHG by 8% during the period 2008–2012 in comparison to their 1990 levels. Subsequently, in a scheme known as “burden-sharing”, Portugal was allowed to increase its emissions by 27% in the same period. Large industrial facilities are responsible for a significant share of carbon dioxide (CO2) emissions and are object of a European Directive (2003/87/EC) establishing the scheme for GHG emission allowance trading within the European Union, launched with the purpose of allowing the reduction of GHG emissions cost-effectively. According to the Directive, Member States shall develop a National Allocation Plan (NAP) stating the total quantity of allowances that each one intends to allocate and how it proposes to allocate them among the activities included in the trading scheme. In this work, an analysis of the Portuguese industry is performed, focused on the energy consumption and CO2 emissions levels in the period 1990–2001 and on the estimation of the two parameters for the period 2002–2012, considering different economic growth scenarios and investments on energy reduction technologies. Results show that all the analysed sectors present a significant growth in CO2 emissions...

Spatial and temporal variability of CO2 emisions in soils under conventional tillage and no-till farming

Carbonell-Bojollo, R.; González- Sánchez, E.; Repullo Ruibérriz De Torres, M.A.; Ordóñez- Fernández, R.; Basch, G.
Fonte: ISTRO Publicador: ISTRO
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
56.63%
Agricultural soils can act as a carbon sink depending on the soil management practices employed. As a result of this functional duality, soil management systems are present in international documents relating to climate change mitigation. Agricultural practices are responsible for 14% of total greenhouse gas emissions (GHG’s) (MMA, 2009)(1). Conservation agriculture (CA) is one of the most effective agricultural systems for reducing CO2 emissions, as it increases the sequestration of atmospheric carbon in the soil. In order to assess the performance of CA in terms of CO2 emissions, a field trial was conducted comparing soil derived CO2 fluxes under No-till (NT) farming and under conventional tillage. Three pilot farms were selected in the cereal-growing area of southern Spain, located in Las Cabezas de San Juan (Seville), Carmona (Seville) and Cordoba. Each pilot farm comprises six experimental plots with an approximate area of five hectares; three of the six plots implement CA practices, while the other three use conventional tillage techniques. The subdivision of each tillage system into 3 plots allowed the simultaneous cropping of the three crops of the wheat-sunflower-legume rotation each year. Results showed that carbon dioxide emissions were 31 to 91% higher in tilled soils than in untilled soils...

Effect of agronomic and environmental factors on CO2 emissions on a dryland rotation

Carbonell-Bojollo, R.; González- Sánchez, E.; Ordóñez- Fernández, R.; Basch, G.; Repullo Ruibérriz de Torres, M.
Fonte: European Conservation Agriculture Federation Publicador: European Conservation Agriculture Federation
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
56.66%
Agriculture is a substantial source of greenhouse gas emissions (GHG) in many countries. Conservation agriculture includes soil management systems that help to reduce CO2 emission levels. However, there are many factors involved in the production of these emissions such as soil management type and time at which the agriculture operations are performed, crop phenological state, the weather, and handling of the residue amongst others. In the long term, the relationships that exist between these factors seem to determine the balance of these emissions. In this study, we analyzed the influence of the soil management system as well as the climatology of the different seasons studied and the phenological state of the different crops implanted. For this purpose a field trial was conducted in Las Cabezas de San Juán (Seville). This pilot farm consisted of six experimental plots with an approximate area of 5 ha; conservation agriculture practices were employed in three of the six plots while traditional tillage management was used in the other three. Within these plots the three crops of the wheat-sunflower-legume rotation were tested simultaneously. The study was conducted over four agricultural seasons - 2009/10, 2010/11, 2011/12 and 2012/13. Each of these cropping seasons were characterised by very different rainfall amounts...

Forest fires in Mediterranean countries: CO2 emissions and mitigation possibilities through prescribed burning

Fernandes, Paulo; Terhi, Vilén
Fonte: Universidade de Trás-os-Montes e Alto Douro Publicador: Universidade de Trás-os-Montes e Alto Douro
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.44%
Forest fires are integral to the Mediterranean Basin but fire incidence has increased dramatically during the past decades and fire is expected to become more prevalent in the future due to climate change. Fuel modification by prescribed burning reduces the spread and intensity potential of subsequent wildfires. We used the most recent published data to calculate the average annual wildfire CO2 emissions in France, Greece, Italy, Portugal and Spain following the IPCC guidelines. The effect of prescribed burning on emissions was calculated for four scenarios of prescribed burning effectiveness based on data from Portugal. Results show that prescribed burning could have a considerable effect on the carbon balance of the Land Use, Land Use Change and Forestry (LULUCF) sector in Mediterranean countries. However, uncertainty in emission estimates remains large, and more accurate data is needed, especially regarding fuel load and fuel consumption in different vegetation types and fuel layers and the total area protected from wildfire per unit area treated by prescribed burning, i.e. the leverage of prescribed burning.

The impact of renewable energy sources on economic growth and CO2 emissions : evidence from Iberian Peninsula

Silva, Filipa Inês Gil
Fonte: Instituto Universitário de Lisboa Publicador: Instituto Universitário de Lisboa
Tipo: Dissertação de Mestrado
Publicado em //2012 ENG
Relevância na Pesquisa
66.61%
Dissertation submitted as partial requirement for the Master’s degree in Economics / JEL Classification: O44 - Environment and Growth; Q42 - Alternative Energy Sources; During the last years, due to a constant increase of the concern about environmental questions and an accompanying development of related policies, there has been an increase in energy production from renewable sources. In this line of thought, the aim of this dissertation is to examine the relationship between renewable energy production, economic growth and CO2 emissions in the Iberian Peninsula, using a Structural Vector Autoregressive model. The innovative contribution of this dissertation is the incorporation of oil prices, as an exogenous variable, since the increase in the price of this raw material in the international market have had very negative impacts on the economies of both countries. This study covers the sample period from 1960 to 2009 and it approaches two distinct analyses: one for aggregate energy production (TRES), considering the total of renewable energy sources; another for disaggregated energy sources, considering hydroelectricity separately from the other renewable sources, due to the high weight of the first in energy production. For the two cases...

Climatic changes: what if the global increase of CO2 emissions cannot be kept under control?

Barreto de Castro,L.A.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2010 EN
Relevância na Pesquisa
66.38%
Climatic changes threaten the planet. Most articles related to the subject present estimates of the disasters expected to occur, but few have proposed ways to deal with the impending menaces. One such threat is the global warming caused by the continuous increase in CO2 emissions leading to rising ocean levels due to the increasing temperatures of the polar regions. This threat is assumed to eventually cause the death of hundreds of millions of people. We propose to desalinize ocean water as a means to reduce the rise of ocean levels and to use this water for populations that need good quality potable water, precisely in the poorest regions of the planet. Technology is available in many countries to provide desalinated water at a justifiable cost considering the lives threatened both in coastal and desertified areas.

CO2 emissions from a tropical hydroelectric reservoir (Balbina, Brazil).

KEMENES, A.; FORSBERG, B. R.; MELACK, J. M.
Fonte: Journal of Geophysical Research, Washington, v. 116, n. G03004, p. 1-11, 2011. Publicador: Journal of Geophysical Research, Washington, v. 116, n. G03004, p. 1-11, 2011.
Tipo: Artigo em periódico indexado (ALICE)
EN
Relevância na Pesquisa
56.65%
Hydroelectric reservoirs can release significant quantities of CO2, but very few results are available from the tropics. The objective of the present study was to estimate the emission of CO2 from the Balbina hydroelectric reservoir in the central Brazilian Amazon. Diffusive and ebullitive emissions were estimated at regular intervals, both above and below the dam, using a combination of static chambers and submerged funnels. Gas releases immediately below the dam were calculated as the difference between gas flux at the entrance and the outflow of the hydroelectric turbines. An inundation model derived from a bathymetric map and daily stage readings was used for spatial and temporal interpolation of reservoir emissions. Annual emissions of CO2, upstream and downstream of Balbina dam for 2005, were estimated as 2450 and 81 Gg C, respectively, for a total annual flux of 2531 Gg C. Upstream emissions were predominantly diffusive with only 0.02 Gg C yr-1 resulting from ebullition. On average, 51% of the downstream emission was released by degassing at the turbine outflow, and the remainder was lost by diffusion from the downstream river. The total annual greenhouse gas emission from Balbina dam, including the CO2 equivalent of previously estimated CH4 emissions...

An Analysis of Various Policy Instruments to Reduce Congestion, Fuel Consumption and CO2 Emissions in Beijing

Anas, Alex; Timilsina, Govinda R.; Zheng, Siqi
Fonte: Banco Mundial Publicador: Banco Mundial
Relevância na Pesquisa
56.6%
Using a nested multinomial logit model of car ownership and personal travel in Beijing circa 2005, this paper compares the effectiveness of different policy instruments to reduce traffic congestion and CO2 emissions. The study shows that a congestion toll is more efficient than a fuel tax in reducing traffic congestion, whereas a fuel tax is more effective as a policy instrument for reducing gasoline consumption and emissions. An improvement in car efficiency would also reduce congestion, fuel consumption, and CO2 emissions significantly; however, this policy benefits only richer households that own a car. Low-income households do better under the fuel tax policy than under the efficiency improvement and congestion toll policies. The congestion toll and fuel tax require the travel cost per mile to more than triple. The responsiveness of aggregate fuel and CO2 are, approximately, a 1 percent drop for each 10 percent rise in the money cost of a car trip.

Why Have CO2 Emissions Increased in the Transport Sector in Asia? Underlying Factors and Policy Options

Timilsina, Govinda R.; Shrestha, Ashish
Fonte: Banco Mundial Publicador: Banco Mundial
Relevância na Pesquisa
66.76%
Rapidly increasing emissions of carbon dioxide from the transport sector, particularly in urban areas, is a major challenge to sustainable development in developing countries. This study analyzes the factors responsible for transport sector CO2 emissions growth in selected developing Asian countries during 1980-2005. The analysis splits the annual emissions growth into components representing economic development; population growth; shifts in transportation modes; and changes in fuel mix, emission coefficients, and transportation energy intensity. The study also reviews existing government policies to limit CO2 emissions growth, particularly various fiscal and regulatory policy instruments. The study finds that of the six factors considered, three - economic development, population growth, and transportation energy intensity - are responsible for driving up transport sector CO2 emissions in Bangladesh, the Philippines, and Vietnam. In contrast, only economic development and population growth are responsible in the case of China...

Atmospheric Stabilization of CO2 Emissions : Near-term Reductions and Intensity-based Targets

Timilsina, Govinda R.
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Relevância na Pesquisa
66.78%
This study analyzes CO2 emissions reduction targets for various countries and geopolitical regions by the year 2030 in order to stabilize atmospheric concentrations of CO2 at the level of 450 ppm (550 ppm including non CO2 greenhouse gases). It also determines CO2 intensity cuts that would be needed in those countries and regions if the emission reductions were achieved through intensity-based targets while assuming no effect on forecasted economic growth. Considering that the stabilization of CO2 concentrations at 450 ppm requires the global trend of CO2 emissions to reverse before 2030, this study develops two scenarios: reversing the global CO2 trend in (i) 2020 and (ii) 2025. The study shows that global CO2 emissions would be 42 percent above the 1990 level in 2030 if the increasing trend of global CO2 emissions is reversed by 2020. If reversing the trend is delayed by 5 years, the 2030 global CO2 emissions would be 52 percent higher than the 1990 level. The study also finds that to achieve these targets while maintaining assumed economic growth...

CO2 emissions from Illinois Basin coals and influence of their petrographic composition

Drobniak, Agnieszka; Mastalerz, Maria; Chadwick, Crystal
Fonte: Universidade de Indiana Publicador: Universidade de Indiana
Tipo: Conferência ou Objeto de Conferência
EN_US
Relevância na Pesquisa
66.76%
This poster was presented at the 27th annual meeting of The Society for Organic Petrology, Denver, Colorado, 12-16 September, 2010.; Lithotypes from Pennsylvanian high-volatile bituminous coals from the Illinois Basin were isolated by hand and analyzed to investigate the influence of their chemical and petrographic composition on the amount of CO2 emissions during combustion. Heating values and ultimate carbon contents were used to calculate CO2 emissions from individual lithotypes as well as whole seam samples. The influence of maceral composition, vitrinite reflectance (Ro), and other selected coal properties on calculated CO2 emissions was investigated for the Danville, Springfield, and Lower Block Coal Members of the Dugger, Petersburg, and Brazil Formations, respectively. In general, little difference in CO2 emissions has been documented for each of the four locations. Calculated mean values of CO2 emission from bulk seam samples vary from 86.04 to 88.38 (in kg of CO2 per gigajoule [GJ]). Emissions from selected lithotypes show more variations. In fusains, CO2 emissions vary from 78.93 to 95.58, with 89.58 being the average. Fusain is the lithotype that has the highest average emissions of all lithotypes studied. For vitrains...

Impact of Renewables Deployment on the CO2 Price and the CO2 Emissions in the European Electricity Sector

VAN DEN BERGH, Kenneth; DELARUE, Erik; D'HAESELEER, William
Fonte: Instituto Universitário Europeu Publicador: Instituto Universitário Europeu
Tipo: Trabalho em Andamento Formato: application/pdf
EN
Relevância na Pesquisa
66.6%
As of 2005, electricity generators in Europe operate under the European Union Emission Trading System (EU ETS). At the same time, European Member States have launched support mechanisms to stimulate the deployment of renewable electricity sources (RES-E). RES-E injections displace CO2 emissions within the sectors operating under the EU ETS and they reduce the demand for European Union Allowances (EUAs), therefore reducing the EUA price. This paper presents the results of an ex-post analysis to quantify the impact of RES-E deployment on the EUA price and CO2 emissions in the Western and Southern European electricity sector during the period from 2007 to 2010. This study shows that the CO2 displacement from the electricity sector to other ETS sectors due to RES-E deployment can be up to more than 10 % of historical CO2 emissions in the electricity sector. The EUA price decrease caused by RES-E deployment varies between zero and multiple times the historical EUA price.

O impacto energético e as emissões de CO2 dos veículos eléctricos em Portugal

Pimenta, Carlos Manuel Mateus
Fonte: Instituto Politécnico de Lisboa Publicador: Instituto Politécnico de Lisboa
Tipo: Dissertação de Mestrado
Publicado em /12/2011 POR
Relevância na Pesquisa
56.69%
Para a diminuição da dependência energética de Portugal face às importações de energia, a Estratégia Nacional para a Energia 2020 (ENE 2020) define uma aposta na produção de energia a partir de fontes renováveis, na promoção da eficiência energética tanto nos edifícios como nos transportes com vista a reduzir as emissões de gases com efeito de estufa. No campo da eficiência energética, o ENE 2020 pretende obter uma poupança energética de 9,8% face a valores de 2008, traduzindo-se em perto de 1800 milhões de tep já em 2015. Uma das medidas passa pela aposta na mobilidade eléctrica, onde se prevê que os veículos eléctricos possam contribuir significativamente para a redução do consumo de combustível e por conseguinte, para a redução das emissões de CO2 para a atmosfera. No entanto, esta redução está condicionada pelas fontes de energia utilizadas para o abastecimento das baterias. Neste estudo foram determinados os consumos de combustível e as emissões de CO2 de um veículo de combustão interna adimensional representativo do parque automóvel. É também estimada a previsão de crescimento do parque automóvel num cenário "Business-as-Usual", através dos métodos de previsão tecnológica para o horizonte 2010-2030...

Empirics of the international inequality in CO2 emissions intensity : explanatory factors according to complementary decomposition methodologies

Duro Moreno, Juan Antonio; Teixidó-Figueras, Jordi; Padilla, Emilio
Fonte: Universitat Autònoma de Barcelona. Departament d'Economia Aplicada Publicador: Universitat Autònoma de Barcelona. Departament d'Economia Aplicada
Tipo: Trabalho em Andamento Formato: application/pdf
Publicado em //2013 ENG
Relevância na Pesquisa
66.52%
This paper analyses the international inequalities in CO2 emissions intensity for the period 1971- 2009 and assesses explanatory factors. Multiplicative, group and additive methodologies of inequality decomposition are employed. The first allows us to clarify the separated role of the carbonisation index and the energy intensity in the pattern observed for inequalities in CO2 intensities; the second allows us to understand the role of regional groups; and the third allows us to investigate the role of different fossil energy sources (coal, oil and gas). The results show that, first, the reduction in global emissions intensity has coincided with a significant reduction in international inequality. Second, the bulk of this inequality and its reduction are attributed to differences between the groups of countries considered. Third, coal is the main energy source explaining these inequalities, although the growth in the relative contribution of gas is also remarkable. Fourth, the bulk of inequalities between countries and its decline are explained by differences in energy intensities, although there are significant differences in the patterns demonstrated by different groups of countries.

The causal factors of international inequality in CO2 emissions per capita : a regression-based inequality decomposition analysis

Duro Moreno, Juan Antonio; Teixidó-Figueras, Jordi; Padilla, Emilio
Fonte: Universitat Autònoma de Barcelona. Departament d'Economia Aplicada Publicador: Universitat Autònoma de Barcelona. Departament d'Economia Aplicada
Tipo: Trabalho em Andamento Formato: application/pdf
Publicado em //2014 CAT
Relevância na Pesquisa
66.47%
This paper uses the possibilities provided by the regression-based inequality decomposition (Fields, 2003) to explore the contribution of different explanatory factors to international inequality in CO2 emissions per capita. In contrast to previous emissions inequality decompositions, which were based on identity relationships (Duro and Padilla, 2006), this methodology does not impose any a priori specific relationship. Thus, it allows an assessment of the contribution to inequality of different relevant variables. In short, the paper appraises the relative contributions of affluence, sectoral composition, demographic factors and climate. The analysis is applied to selected years of the period 1993–2007. The results show the important (though decreasing) share of the contribution of demographic factors, as well as a significant contribution of affluence and sectoral composition.

An analysis of the performance of certification schemes in the hotel sector in terms of CO2 emissions reduction.

Houlihan-Wiberg, Aoife Anne-marie
Fonte: University of Cambridge; Department of Architecture Publicador: University of Cambridge; Department of Architecture
Tipo: Thesis; doctoral; PhD
EN
Relevância na Pesquisa
66.8%
No page 475 due to incorrect pagination - dissertation complete.; In assessing the impact of global tourism on climate change, emissions from transport receive the most attention although emissions associated with accommodation account for more than 20% of the total. A plethora of hotel certification schemes have been established worldwide that assess various environmental performance indicators, among them energy use. However, none explicitly quantify CO2 emissions, and in many, energy is poorly accounted for, or other non-energy related factors are weighted so that the overall impact of energy use (and hence CO2 emission) is weak. The main thrust of the research is to ascertain the effect of certification on CO2 emissions. The research questions whether the certification schemes are robust and rigorous and whether the results are credible. First, four widely used certification schemes are compared Nordic Swan (Scandinavia), Green Globe (Worldwide), EU Flower (European) and Green Hospitality Award (Ireland). The key issues are identified such as performance and process related criteria, use of benchmarks, and the weighting of different categories. A comparison is made with LEED-EB...

Economic Input-Output Analysis of China's CO2 Emissions

A, Rouna
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Masters' project
Publicado em 25/04/2013 EN_US
Relevância na Pesquisa
66.59%
China, as the biggest GHG emitter and the largest developing country, has been urged by international society to take responsibilities for reducing GHG, especially in the post-Kyoto commitment period. Currently, the United Nations Framework Convention on Climate Change (UNFCCC) assigns the responsibility to parties who produce the GHG, using the production-based GHG emissions inventories. However, some scholars argue that if consumption-based GHG emissions inventories were used, China would be less responsible for GHG emissions because GHG emissions embedded in exporting products directly contribute to its total emissions. This paper analyzes China’s CO2 emissions in 2007 using Economic Input-Output (EIO) method, and finds that China’s domestic emissions make up a large proportion of total emissions, and export-embodied emissions accounts for 15% of domestic emissions. What’s more, results of production-based accounting method are different from results of consumption-based accounting method. These two different methods mainly impact the emissions from regions that belong to eastern China. If China attempts to implement environmental policies to achieve the emissions reduction target, different regional characteristics need to be considered.

RADON AND CO2 EMISSIONS IN DIFFERENT GEOLOGICAL ENVIRONMENTS AS A TOOL FOR MONITORING VOLCANIC AND SEISMIC ACTIVITY IN CENTRAL PART OF COLOMBIA

Londoño B.,John Makario
Fonte: Boletin de Geología Publicador: Boletin de Geología
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2009 EN
Relevância na Pesquisa
56.61%
222Rn (radon) and CO2 emissions in soil has been measured during a lapse time of several years in three different geological environments at the central part of Colombia, namely Nevado del Ruiz Volcano (NRV), an active volcanic area, Coffee Axes (CA), an active tectonic zone, and Cerro Machín Volcano (CMV), a zone starting a volcanic reactivation process, in order to compare levels of emissions and to monitoring volcanic and seismic activity. Three networks were deployed, with a total of 16 stations. NRV zone showed the highest values of radon emission, followed by CMV and finally CA. Temporal changes of radon and CO2 emissions were detected for CA and CMV, related with seismic activity. Although NRV showed stability during the studied period, in agreement with steady tendency in radon emissions, high levels of radon emission were detected. This could be related with the level of activity of NRV, which is still in an active stage, and probably there is a delay effect on its activity, implying a future increase in its activity. For CMV, some temporal changes were detected too, associated probably with the increase in activity of this volcano. 222Rn/CO2 ratios were calculated for several stations. Ratios were similar for the three zones...