Academic literature on the topic 'CO2 fluxe'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'CO2 fluxe.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "CO2 fluxe"
Jamali, H., S. J. Livesley, L. B. Hutley, B. Fest, and S. K. Arndt. "The relationships between termite mound CH<sub>4</sub>/CO<sub>2</sub> emissions and internal concentration ratios are species specific." Biogeosciences 10, no. 4 (April 5, 2013): 2229–40. http://dx.doi.org/10.5194/bg-10-2229-2013.
Full textJamali, H., S. J. Livesley, L. B. Hutley, B. Fest, and S. K. Arndt. "The relationship between termite mound CH<sub>4</sub>/CO<sub>2</sub> emissions and internal concentration ratios are species specific." Biogeosciences Discussions 9, no. 12 (December 7, 2012): 17313–45. http://dx.doi.org/10.5194/bgd-9-17313-2012.
Full textHirsch, A. I. "On using radon-222 and CO<sub>2</sub> to calculate regional-scale CO<sub>2</sub> fluxes." Atmospheric Chemistry and Physics Discussions 6, no. 6 (November 2, 2006): 10929–58. http://dx.doi.org/10.5194/acpd-6-10929-2006.
Full textHirsch, A. I. "On using radon-222 and CO<sub>2</sub> to calculate regional-scale CO<sub>2</sub> fluxes." Atmospheric Chemistry and Physics 7, no. 14 (July 17, 2007): 3737–47. http://dx.doi.org/10.5194/acp-7-3737-2007.
Full textDong, Yuanxu, Mingxi Yang, Dorothee C. E. Bakker, Vassilis Kitidis, and Thomas G. Bell. "Uncertainties in eddy covariance air–sea CO<sub>2</sub> flux measurements and implications for gas transfer velocity parameterisations." Atmospheric Chemistry and Physics 21, no. 10 (May 26, 2021): 8089–110. http://dx.doi.org/10.5194/acp-21-8089-2021.
Full textCui, Hang. "Greenhouse gas emission fluxes from peat bogs in the Arak Lake Basin in 2021." IOP Conference Series: Earth and Environmental Science 937, no. 2 (December 1, 2021): 022035. http://dx.doi.org/10.1088/1755-1315/937/2/022035.
Full textIshidoya, Shigeyuki, Hirofumi Sugawara, Yukio Terao, Naoki Kaneyasu, Nobuyuki Aoki, Kazuhiro Tsuboi, and Hiroaki Kondo. "O<sub>2</sub> : CO<sub>2</sub> exchange ratio for net turbulent flux observed in an urban area of Tokyo, Japan, and its application to an evaluation of anthropogenic CO<sub>2</sub> emissions." Atmospheric Chemistry and Physics 20, no. 9 (May 15, 2020): 5293–308. http://dx.doi.org/10.5194/acp-20-5293-2020.
Full textItoh, Masayuki, Yoshiko Kosugi, Satoru Takanashi, Shuhei Kanemitsu, Ken'ichi Osaka, Yuki Hayashi, Makoto Tani, and Abdul Rahim Nik. "Effects of soil water status on the spatial variation of carbon dioxide, methane and nitrous oxide fluxes in tropical rain-forest soils in Peninsular Malaysia." Journal of Tropical Ecology 28, no. 6 (November 2012): 557–70. http://dx.doi.org/10.1017/s0266467412000569.
Full textErkkilä, Kukka-Maaria, Anne Ojala, David Bastviken, Tobias Biermann, Jouni J. Heiskanen, Anders Lindroth, Olli Peltola, Miitta Rantakari, Timo Vesala, and Ivan Mammarella. "Methane and carbon dioxide fluxes over a lake: comparison between eddy covariance, floating chambers and boundary layer method." Biogeosciences 15, no. 2 (January 19, 2018): 429–45. http://dx.doi.org/10.5194/bg-15-429-2018.
Full textPeng, Z., M. Zhang, X. Kou, X. Tian, and X. Ma. "A regional carbon flux data assimilation system and its preliminary evaluation in East Asia." Atmospheric Chemistry and Physics Discussions 14, no. 14 (August 8, 2014): 20345–81. http://dx.doi.org/10.5194/acpd-14-20345-2014.
Full textDissertations / Theses on the topic "CO2 fluxe"
SILVA, Paulo Ferreira da. "Fluxos de CO2, água e energia em pastagens e caatinga no semiárido pernambucano." Universidade Federal Rural de Pernambuco, 2015. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/6574.
Full textMade available in DSpace on 2017-03-14T13:22:51Z (GMT). No. of bitstreams: 1 Paulo Ferreira da Silva.pdf: 1871633 bytes, checksum: e99149f8fc75908f1d9ee5e36ea3b553 (MD5) Previous issue date: 2015-07-20
The natural vegetation of Caatinga is relatively well adapted and tolerant to drought and to high temperatures. It is known that forest conversions to pasture and/or crop cultivation are human interventions, which affect energy exchanges, water and carbon between land surface and the atmosphere. However, up to the present moment, there is no study measuring these fluxes in the caatinga and pastures areas in the Brazilian semiarid lands. Thus, this paper aimed at determining the fluxes of energy, H2O and CO2 in areas of caatinga and pastures, as well as at analyzing the seasonal variability patterns of these fluxes. The land activities were carried out in two areas, one of them located on the Buenos Aires farm (7° 59’ 31’’ S and 38° 17’ 59’’ O), and the other located on the Lagoinha farm (07° 56’ 50,4’’ S and 38° 23’ 29’’ O), cultivated with pasture of grass chain (Urochloa mosambicensis), both properties located in the city of Serra Talhada, state of Pernambuco, Brazil. In order to determine the fluxes of energy, H2O and CO2, a methodology of correlation of swirls was adopted, by means of micrometeorological towers, installed in the center of each experimental area. Along with the index of foliar area, we have also measured the aboveground phytomass of both the pasture and the caatinga herbaceous vegetation, as well as water storage in the soil, by means of TDR sensors. On the basis of the results, it has been found that the maximum production of dry pasture mass was in the order of 2,208 kg ha-1 and annual average of 832 kg ha-1. On the other hand, the caatinga dry mass was in the order of 2,559 kg ha-1 and the annual average was 626 kg ha-1. Water storage in the soil (0-40 cm) of pasture was 29% greater than the one of the caatinga. This fact was possibly attributed to the interception of rain by the caatinga canopy. In relation the fluxes of energy, radiation balance (Rb) was used mainly as sensitive flow of heat (H), with 51% in the pasture and 47% in the caatinga. The fraction of Rb used as flow of latent heat (LE) was of 23% in the pasture and 32% in the caatinga. In relation to the evapotranspiration, the caatinga had total values (523 mm) and average values (1,4 mm d-1) greater than the pasture (389 mm and 1,1 mm d-1), possibly due to the greater depth of its radicular system. During the experimental period, the fluxes of daily average CO2 were ˗ 0,91 and ˗ 0,68 μmol m-2 s-1 for the caatinga and the pasture, respectively. Not only during the rainy season but also the dry season, the vegetation acted as atmospheric CO2 sink. The caatinga was more efficient than the pasture, sequestrating in average 14,6 kg of C ha-1 d-1, during the rainy season and 4,3 kg of C ha-1 d-1, in the dry season, while the pasture sequestrated 11,7 kg of C ha-1 d-1, in the rainy season and 2,5 kg of C ha-1 d-1, in the dry season. The caatinga has proved more efficient than the pasture in using soil water (greater ET) and in sequestrating atmospheric CO2.
A vegetação natural da Caatinga é relativamente bem adaptada e tolerante à seca e a altas temperaturas. Sabe-se que a conversão de florestas em pastagens e/ou cultivo de lavouras são intervenções humanas que afetam as trocas de energia, água e carbono entre a superfície da terra e a atmosfera. No entanto, até o momento não se tem nenhum estudo medindo esses fluxos em áreas de caatinga e de pastagens no semiárido brasileiro. Desse modo, este trabalho teve como objetivo determinar os fluxos de energia, H2O e CO2 em áreas de caatinga e de pastagens, além de analisar os padrões de variabilidade sazonal desses fluxos. A s atividades de campo foram realizadas em duas áreas, sendo uma localizada na Fazenda Buenos Aires (7º 59’ 31” S e 38º 17’ 59” O) e a outra localizada na Fazenda Lagoinha (07° 56’ 50,4”S e 38° 23’ 29” O), cultivada com a pastagem capim corrente (Urochloa mosambicensis), ambas propriedades localizadas no Município de Serra Talhada PE. Para a determinação dos fluxos de energia, H2O e CO2 foi usada a metodologia da correlação dos turbilhões, por meio de torres micrometeorológicas instaladas no centro de cada área experimental. Foram medidos o índice de área foliar e a biomassa áerea da pastagem e da vegetação herbácea da caatinga e o armazenamento de água no solo, por meio de sensores TDR. Dos resultados, verificou-se que a produção máxima de massa seca da pastagem foi de 2.208 kg ha-1 e média anual de 832 kg ha-1, já a massa seca máxima da caatinga foi de 2.559 kg ha-1 e a média anual de 626 kg ha-1. O armazenamento de água no solo (0-40 cm) da pastagem foi 29% maior que da caatinga, possivelmente devido a interceptação da chuva pelo dossel da caatinga. Com relação aos fluxos de energia, o saldo de radiação (Rn) foi utilizado principalmente como fluxo de calor sensível (H), com 51% na pastagem e 47% na caatinga. A fração do Rn usada como fluxo de calor latente (LE) foi de 23% na pastagem e 32% na caatinga. Com relação a evapotranspiração, a caatinga teve valores totais (523 mm) e médios (1,4 mm d-1) maiores que a pastagem (389 mm e 1,1 mm d-1), possivelmente, devido a maior profundidade de seu sistema radicular. Durante o período experimental os fluxos de CO2 médios diários foram de -0,91 e -0,68 mol m-2 s-1 para a caatinga e a pastagem, respectivamente. Tanto na estação chuvosa quanto na estação seca, ambas as vegetações atuaram como sumidouro de CO2 atmosférico. A caatinga foi mais eficiente que a pastagem, sequestrando em média 14,6 kg de C ha-1 d-1, na estação chuvosa e 4,3 kg de C ha-1 d-1, na estação seca; enquanto a pastagem sequestrou 11,7 kg de C ha-1 d-1, na estação chuvosa e 2,5 kg de C ha-1 d-1, na estação seca. A caatinga demonstrou ser mais eficiente em usar a água do solo (maior ET) e sequestrar CO2 atmosférico que a pastagem.
RIBEIRO, Apolo Alves. "Fluxos de CO2 e de vapor d’água em feijão cultivado no agreste meridional pernambucano." Universidade Federal Rural de Pernambuco, 2014. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/6645.
Full textMade available in DSpace on 2017-03-23T13:07:11Z (GMT). No. of bitstreams: 1 Apolo Alves Ribeiro.pdf: 1727548 bytes, checksum: 8e7f8a7459cd445c7152921b7145c618 (MD5) Previous issue date: 2014-12-09
Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq
Many important processes occurring in ecosystems, such as photosynthesis and productivity of vegetation, are associated with the exchange of CO2, water and energy. Accurate measurement of these fluxes are therefore fundamental to a broad understanding of the carbon cycle in terrestrial ecosystems. However, no such study was conducted under the conditions of the Agreste of Pernambuco, with the bean crop. Given the above, this study aimed to quantify the water, energy and CO2 fluxes in soil cultivated with bean under rainfed conditions. The study was conducted in a bean producing area of the city of São João, where were installed sensors to measure these fluxes, using the energy balance method - eddy covariance (energy and CO2 fluxes) and soil water balance method (water fluxes) in the period from 31/05/2013 to 08/20/2013. In addition to these measurements were also measured height, leaf area index (LAI) and the bean yield. Regarding the components of the water balance was found that the flow of water at a depth of 35 cm (deep drainage and/or capillarity rise) had very low values. It was also observed that the periods of high rainfall resulted in higher water storage in soil and increased evapotranspiration (ET). The ET obtained by water balance method had a total and average values of 146.0 mm and 1.78 mm d-1, respectively. The bean presented its highest water consumption during the reproductive period (29/06/2013 to 29/07/2013), with an average value of 2.55 mm d-1. Regarding the energy fluxes, it was found that the latent heat flux (LE) consumed on average 78.46% of the radiation (Rn). The ET, measured by the eddy covariance method, was total value of 179.3 mm, with a mean value of 2.2 mm d-1. Bean yield was 2,050 kg ha-1, with water use efficiency of 1.16 kg m-3. Regarding the CO2 fluxes, it was observed that the same varied from -11.21 to -0.75 mol m-2 s-1, indicating the occurrence of carbon sequestration by the crop. On average, bean sequestered 54 kg C ha-1 per day, the equivalent to 3.3 t C ha-1 during the trial period.
Muitos processos importantes que ocorrem nos ecossistemas, tais como, a fotossíntese e a produtividade da vegetação, estão associados com as trocas de CO2, água e energia. Medições precisas desses fluxos são, portanto, fundamentais para uma ampla compreensão do ciclo do carbono em ecossistemas terrestres. No entanto, nenhum estudo desse tipo foi realizado nas condições do agreste meridional de Pernambuco, com a cultura do feijão. Diante do exposto, o presente trabalho objetivou quantificar os fluxos de água, de energia e de CO2 em solo cultivado com feijão sob condições de sequeiro. O trabalho foi realizado em uma área produtora de feijão do município de São João, onde se instalou sensores para medir esses fluxos, usando as metodologias do balanço de energia - correlação dos turbilhões (fluxos de energia e de CO2) e do balanço hídrico no solo (fluxos de água) no período de 31/05/2013 a 20/08/2013. Também foram determinadas a altura, o índice de área foliar (IAF) e a produtividade do feijão. Em relação aos componentes do balanço hídrico verificou-se que o fluxo de água (drenagem profunda e/ou ascensão capilar) na profundidade de 35 cm teve valores muito baixos, como também que os períodos de elevada pluviosidade resultaram em maior armazenamento de água no solo e maior evapotranspiração (ET). A ET do feijão pelo método do balanço hídrico teve valor total e médio de 146,0 mm e 1,78 mm d-1, respectivamente. A cultura apresentou seu maior consumo de água no período reprodutivo (29/06/2013 a 29/07/2013), com valor médio de 2,55 mm d-1. Quanto aos fluxos de energia, verificou-se que o fluxo de calor latente (LE) consumiu em média 78,46% do saldo de radiação (Rn). A ET medida pela metodologia da correlação dos turbilhões obteve valor total durante o período experimental de 179,3 mm, com média de 2,2 mm d-1. A produtividade do feijão foi de 2.050 kg ha-1, com eficiência do uso de água de 1,16 kg m-3. Em relação aos fluxos de CO2, observou-se que os mesmos variaram de -0,75 a -11,21 mol m-2 s-1, indicando a ocorrência de sequestro de carbono pelo feijão. Em média, o feijão sequestrou 54 kg de C ha-1 por dia, o equivalente a 3,3 t de C ha-1 durante o período experimental.
Bianchi, Alejandro. "Sea-air CO2 fluxes in the Patagonia sea." Paris 6, 2010. http://www.theses.fr/2010PA066613.
Full textVandeburie, Emile. "CO2-emissions from rivers and streams : Seasonal variation of pCO2-levels and CO2-fluxes." Thesis, Mittuniversitetet, Institutionen för ekoteknik- och hållbart byggande, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-40804.
Full text2020-06-17
Molina, Carpio Luis. "Modélisation inverse des flux de CO2 en Amazonie." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLV040/document.
Full textA better knowledge of the seasonal and inter-annual variations of the Amazon carbon cycle is critical to understand the influence of this terrestrial ecosystem on climate change. Atmospheric inverse modeling is a powerful tool to estimate these variations by extracting the information on the spatio-temporal patterns of surface CO2 fluxes contained in observations of atmospheric CO2. However, the confidence in the Amazon flux estimates obtained from global inversion frameworks is low, given the scarcity of observations in this region.In this context, I started by analyzing in detail the Amazon net ecosystem exchange (NEE) inferred with two global inversions over the period 2002 — 2010. Both inversions assimilated data from the global observation network outside Amazonia, and one of them also assimilated data from four stations in Amazonia that had not been used in previous inversion efforts. I demonstrated that in a global inversion the observations from sites distant from Amazonia, as well as local observations, controlled the NEE inferred through the inversion. The inferred fluxes revealed large-scale structures likely not consistent with the actual NEE in Amazonia. This analysis confirmed the lack of observation sites in Amazonia to provide reliable flux estimates, and exposed the limitations of global frameworks, using low-resolution models to quantify regional fluxes. This limitations justified developing a regional approach.Then I evaluated the benefit of the regional atmospheric model BRAMS, relative to the global forecast system ECMWF, when both models provided the meteorological fields to drive the atmospheric transport model CHIMERE to simulate CO2 transport in tropical South America at high resolution (~35 km). I simulated the CO2 distribution with both transport models―CHIMERE-BRAMS and CHIMERE-ECMWF. I evaluated the model simulations with aircraft measurements in vertical profiles, analyzing the concentrations associated to the individual measurements, but also with horizontal gradients along wind direction between pairs of sites at different altitudes, or vertically integrated. Both transport models simulated the CO2 observations with similar performance, but I found a strong impact of the uncertainty in the transport models. Both individual measurements and horizontal gradients were most sensitive to NEE, but also to biomass burning CO2 emissions (EFIRE) in the dry season. I found that horizontal gradients were more suitable for inversions than individual measurements, since the former were less sensitive fluxes outside South America and further decreased the impact of the transport model uncertainty in altitude.Finally, I developed two analytical regional inversion systems for tropical South America, driven with CHIMERE-BRAMS and CHIMERE-ECMWF, and made inversions with four observation vectors: individual concentration measurements and horizontal gradients at five vertical levels, close to the surface, or horizontal gradients vertically integrated. I found a strong dependency of the inverted regional and sub-regional NEE and EFIRE emissions budgets on both the transport model and the observation vector. Inversions with gradients yielded a better separation of NEE and EFIRE signals. However, the large uncertainties in the inverted fluxes, did not yield high confidence in the estimates. Therefore, even though my study did not improve the knowledge of seasonal and year-to-year variations of the NEE in Amazonia, it demonstrated need of further efforts to improve transport modeling in the region and the inverse modeling strategy, at least through a careful definition of the observation vector that accounts for the characteristics of the available data, and the limitations of the current transport models
Schneider, Julia [Verfasser]. "Dynamics of CO2 fluxes from boreal peatlands / Julia Schneider." Greifswald : Universitätsbibliothek Greifswald, 2011. http://d-nb.info/1016213255/34.
Full textGoret, Marine. "Etude des interactions entre le climat urbain et le CO2 : modélisation des flux de CO2 et application à l'échelle d'une ville." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0119.
Full textClimate and CO2 are closely tied. The link between them is so well established that the objectives for global warming mitigation are expressed in terms of the maximum amount of CO2 equivalent that can be emitted. The amount of CO2 present in the atmosphere at a given time is the result of complex exchanges and equilibriums between the atmosphere and the earth's surface. The latter is composed not only of oceans, vegetation and natural soils, but also cities. Exchanges between the atmosphere and urban surfaces come mainly from four contributors: building emissions, road traffic, human respiration and urban vegetation. Two of these contributors depend on climate: buildings and vegetation. Buildings emissions, at least at high and medium latitudes, are strongly related to space heating, and therefore fluctuate with the outside temperature. As for the vegetation, its growth and open-up speed depends on the weather and climate conditions and more particularly on temperature, precipitation and solar radiation. The CO2 emitted by the city is then transported through the atmosphere by the local atmospheric circulation which is the result of the synoptic situation modified by the city's influence. Therefore there are strong interactions between climate and CO2 at the city scale: the city's carbon footprint depends on the local climate, and the transport of CO2 through the atmosphere is influenced by the atmospheric circulation induced by the city. The aim of this thesis is to study these interactions. That's why, the modeling of CO2 exchanges between urban surfaces and the atmosphere has been added to the urban micro-climate model TEB. This allows to verify that the physical processes that link CO2 emissions/uptakes in the city and the urban climate are well identified and understood. The model is evaluated on two case studies each of which specifically assessed one of the contributors to city/atmosphere CO2 exchanges that is weather-sensitive: the buildings on the Toulouse site (France), and the vegetation on the Kumpula site (Finland). These two sites demonstrate the model's ability to reproduce CO2 exchanges between urban surfaces and the atmosphere as well as their daily and seasonal cycles. The Toulouse site underlines the importance of a detailed knowledge of the inhabitants' energy behaviour in order to simulate the CO2 emissions of buildings. Kumpula site demonstrates the ability of the ISBA model, designed to describe the interactions between non-urban vegetation and the atmosphere, to describe the CO2 exchanges between urban vegetation and the atmosphere. The model, thus validated, is used to carry our simulations of CO2 emissions from buildings on the scale of the entire urban agglomeration of Toulouse. These simulations once again highlighted the necessity of a good knowledge of the inhabitant's energy behaviors: on our case study (four days in winter), the 2°C reduction of the nigth-time space heating setpoint temperature reduces CO2 emissions by 33%. During these simulations, the transport of CO2 emitted by the city through the atmosphere is also monitored. This shows that, despite a calm wind situation, the CO2 plume created by the city dissipates rapidly (less than a day), limiting the increase in CO2 concentration over the city. Simulations on other cities are neeeded to determine if this result can be generalized. During this thesis, we studied climate/CO2 interactions at the city scale. In the future, it would be interesting to carry out simulations in future climate or in coupled mode with climate models in order to study the feedback between local and global climate/CO2 links
Fonseca, Fábio Luís Alves da. "Variação diurna do fluxo de CO2 na interface ar-mar do Oceano Atlântico Equatorial." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/14/14133/tde-27062013-114814/.
Full textThe diurnal cycle of CO2 is estimated for the month of August on the Atlantic Ocean using a gas transfer algorithm. The algorithm is based on the Monin-Obukhov similarity theory for turbulent transfer at the air-sea interface and the physics of the CO2 transfer at the oceanic molecular layer.
Carvalho, Felipe Rust de. "Fluxo de CO2 e CH4 em uma lagoa tropical (Pantanal, Brasil) com gradiente de turbidez." Universidade Federal de Juiz de Fora, 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/413.
Full textApproved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-01-25T17:38:33Z (GMT) No. of bitstreams: 1 feliperustdecarvalho.pdf: 1379176 bytes, checksum: 9466af729223375427c4edf2872e7dd1 (MD5)
Made available in DSpace on 2016-01-25T17:38:34Z (GMT). No. of bitstreams: 1 feliperustdecarvalho.pdf: 1379176 bytes, checksum: 9466af729223375427c4edf2872e7dd1 (MD5) Previous issue date: 2015-05-26
Ecossistemas de água doce (rios, lagos e reservatórios) desempenham um papel essencial na ciclagem de carbono nos continentes. Esses ambientes são fontes significantes de gases de efeito estufa (GEE) para a atmosfera, principalmente de gás carbônico (CO2) e metano (CH4). Apesar do aumento do número de estimativas, a dinâmica e o controle das emissões naturais de GEE em ambientes aquáticos ainda é pouco estudada, especialmente nos trópicos. O objetivo geral da dissertação foi estimar os fluxos de CO2 e CH4 em uma lagoa tropical rasa com gradiente de turbidez. O trabalho foi realizado na lagoa Sinhá Mariana (MT), uma lagoa pantaneira com a ocorrência de duas regiões hidrológicas distintas; a lagoa é ligada ao rio Mutum de águas claras, pobre em material em suspensão, e baixa turbidez e ao rio Cuiabá de águas túrbidas, que apresenta alta taxa de material em suspensão. Duas coletas foram realizadas no ambiente, caracterizando os períodos hidrológicos de águas altas e águas baixas. A variação temporal, espacial e o pulso de inundação mostraram serem fatores importantes no fluxo de CO2, que variou de -4,95 mmol m-2 d-1 a 282 mmol m-2 d-1 nos períodos amostrados e diferenças significativas foram observadas entre um período e outro, com maiores emissões no período de águas altas (142 ± 40 mmol m-2 d-1) e menores nas águas baixas (2,3 ± 11,5 mmol m-2 d-1). Além disso, os fluxos de CO2 foram significantemente m/aiores nas proximidades do rio Mutum e menores na região túrbida e intermediária da lagoa, em ambos os períodos. Diferentemente, o fluxo total de CH4, embora estimado apenas nas águas altas, registrou os maiores valores médios na região de maior turbidez da lagoa (10,9 ± 6,9 mmol m-2 d-1), seguido pela região intermediária (5,1 ± 3,9 mmol m-2 d-1) e pela região influenciada pela água clara (2,5 ± 1,4 mmol m-2 d-1). A ebulição foi o principal processo de emissão de CH4, responsável por 78% do fluxo total. O gradiente de turbidez registrado ao longo da lagoa pareceu ter sido um fator determinante na dinâmica do fluxo tanto de CO2 quanto do CH4. Os dados deste trabalho reforçam a necessidade da amostragem espacial dos fluxos de CH4 e CO2 em lagos tropical, além de reforçar que estes fluxos podem ser controlados principalmente pela turbidez e pelo pulso de inundação (CO2).
Freshwater ecosystems (lakes, rivers and reservoirs) play an essential role in carbon cycling in the continents. These environments are significant sources of greenhouse gases (GHG), especially carbon dioxide (CO2) and methane (CH4), to the atmosphere. Despite the increase in the number of estimates, the natural GHG emissions dynamics in aquatic environments is still poorly studied, especially in the tropics. The general aim of this work was to estimate the CO2 and CH4 fluxes in a shallow tropical lake with turbidity gradient. The work was conducted in the Sinhá Mariana lake (MT), a wetland lake with the occurrence of two distinct hydrological regions; the lake is connected to the Mutum river (clear water), poor in suspended material with low turbidity, and connected to the Cuiabá River (turbid waters), which features high rate of suspension material. Samples were taken for characterizing the hydrological periods of high and low water. The temporal, spatial variation and the flood pulse shoed to be important factors affecting the CO2 flux, which ranged from -4.95 mmol m-2 d-1 to 282 mmol m-2 d-1. Significant differences were observed from one period to another, with higher emissions during high waters (142 ± 40 mmol m-2 d-1) and lower in the low water (2.3 ± 11.5 mmol m-2 d-1). In addition, the CO2 flux was significantly higher near the Mutum river and lower in the turbid region, in both periods. The total CH4 flux, although estimated only in high waters, showed the highest mean rates in the higher turbidity region of the lake (10.9 ± 6.9 mmol m-2 d-1), followed by the intermediate region (5.1 ± 3.9 mmol m-2 d-1) and the area influenced by clear water (2.5 ± 1.4 mmol m-2 d-1). The ebullition flux was the main CH4 emission pathway, responsible for 78% of the total flux. The turbidity gradient observed along the lake appeared to have been a determining factor in the flux dynamics of both CO2 and CH4. This study data reinforce the need for spatial sampling of CH4 and CO2 fluxes in tropical lakes, in addition to reinforcing that these fluxes can be controlled by turbidity and by the flood pulse (CO2).
Boiron, Olivier. "Caractérisation aérothermique d'un laser CO2 de puissance à flux axial rapide." Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX22093.
Full textBooks on the topic "CO2 fluxe"
Fagnocchi, Giuseppe. Lineamenti di storia della letteratura flautistica: Con un sommario di storia dello strumento. Faenza: Mobydick, 1999.
Find full textFagnocchi, Giuseppe. Lineamenti di storia della letteratura flautistica: Con un sommario di storia dello strumento. Faenza [Ravenna]: Mobydick, 1999.
Find full textSugimoto, Hiroyuki. A method forestimating the sea-air CO2 flux in the Pacific Ocean. Tsukuba-shi: Meteorological Research Institute, 2012.
Find full textKoring, Kristina. CO2-Emissionsminderungspotential und technologische Auswirkungen der Oxyfuel-Technologie im Zementklinkerbrennprozess. Düsseldorf: Verlag Bau + Technik GmbH, 2013.
Find full textOxy-fuel combustion for power generation and carbon dioxide (CO2) capture. Oxford: Woodhead Pub., 2011.
Find full textSavage, Kathleen. BOREAS TGB-1 [i.e. TGB-3] CH4 and CO2 chamber flux data over NSA upland sites. Greenbelt, Md: NASA Goddard Space Flight Center, 2000.
Find full textR, Moore Tim, and Goddard Space Flight Center, eds. BOREAS TGB-1 [i.e. TGB-3] CH4 and CO2 chamber flux data over NSA upland sites. Greenbelt, Md: NASA Goddard Space Flight Center, 2000.
Find full textSavage, Kathleen. BOREAS TGB-1 [i.e. TGB-3] CH4 and CO2 chamber flux data over NSA upland sites. Greenbelt, Md: NASA Goddard Space Flight Center, 2000.
Find full textMeg, Lundstrom, ed. O poder do fluxo: Formas práticas de transformar sua vida com coincidências significativas. Rio de Janeiro: Rocco, 2000.
Find full textUnited States. National Oceanic and Atmospheric Administration, ed. LONG-TERM STUDIES OF PARTICULATE FLUX ON AND NEAR THE JUAN DE FUCA RIDGE... NOAA TECHNICAL MEMORANDUM OAR PMEL-118... U.S. DEPARTMENT OF COM. [S.l: s.n., 2001.
Find full textBook chapters on the topic "CO2 fluxe"
Kürsten, E., and P. Burschel. "Co2-Mitigation By Agroforestry." In Terrestrial Biospheric Carbon Fluxes:, 533–44. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1982-5_36.
Full textLenz-Wiedemann, Victoria I. S., Tim G. Reichenau, Christian W. Klar, and Karl Schneider. "CO2 Fluxes and Transpiration." In Regional Assessment of Global Change Impacts, 287–93. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-16751-0_36.
Full textOverdieck, D. "Effects of Atmospheric CO2 Enrichment on CO2 Exchange Rates of Beech Stands in Small Model Ecosystems." In Terrestrial Biospheric Carbon Fluxes:, 259–77. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1982-5_17.
Full textAkhand, Anirban, Abhra Chanda, Sourav Das, Sugata Hazra, and Tomohiro Kuwae. "CO2 Fluxes in Mangrove Ecosystems." In Blue Carbon in Shallow Coastal Ecosystems, 185–221. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1295-3_7.
Full textLuxmoore, R. J., S. D. Wullschleger, and P. J. Hanson. "Forest Responses to Co2 Enrichment and Climate Warming." In Terrestrial Biospheric Carbon Fluxes:, 309–23. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1982-5_20.
Full textSauerbeck, D. R. "Co2-Emissions From Agriculture: Sources and Mitigation Potentials." In Terrestrial Biospheric Carbon Fluxes:, 381–88. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1982-5_25.
Full textOrr, James C. "Accord Between Ocean Models Predicting Uptake of Anthropogenic CO2." In Terrestrial Biospheric Carbon Fluxes:, 465–81. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1982-5_32.
Full textTeskey, Robert O., Mary Anne McGuire, Jasper Bloemen, Doug P. Aubrey, and Kathy Steppe. "Respiration and CO2 Fluxes in Trees." In Advances in Photosynthesis and Respiration, 181–207. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68703-2_9.
Full textBlanke, Michael M. "CO2 Fluctuations and CO2 Fluxes in a Fruit Tree Orchard." In Impacts of Global Change on Tree Physiology and Forest Ecosystems, 173–77. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-015-8949-9_23.
Full textDale, Virginia H., Sandra Brown, Elizabeth P. Flint, Charles A. S. Hall, Richard A. Houghton, Louis R. Iverson, John F. Richards, and James Uhlig. "Estimating CO2 Flux from Tropical Forests." In Effects of Land-Use Change on Atmospheric CO2 Concentrations, 365–78. New York, NY: Springer New York, 1994. http://dx.doi.org/10.1007/978-1-4613-8363-5_9.
Full textConference papers on the topic "CO2 fluxe"
Zhao, Yuan, Majid Molki, and Michael M. Ohadi. "Heat Transfer and Pressure Drop of CO2 Flow Boiling in Microchannels." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1433.
Full textJeong, Siyoung, Eunsang Cho, and Hark-koo Kim. "Evaporative Heat Transfer and Pressure Drop of CO2 in a Microchannel Tube." In ASME 3rd International Conference on Microchannels and Minichannels. ASMEDC, 2005. http://dx.doi.org/10.1115/icmm2005-75180.
Full textGulev, S. K., S. A. Josey, M. Bourassa, Lars-Anders Breivik, M. F. Cronin, Chris Fairall, Sarah Gille, et al. "Surface Energy, CO2 Fluxes and Sea Ice." In OceanObs'09: Sustained Ocean Observations and Information for Society. European Space Agency, 2010. http://dx.doi.org/10.5270/oceanobs09.pp.19.
Full textPark, C. Y., and P. S. Hrnjak. "CO2 Flow Boiling Heat Transfer and Flow Pattern at Low Temperatures in Horizontal Smooth Tubes." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15184.
Full textF. Mazadiego, L., F. Grandia, J. Elio, B. Nissi, O. Vaselli, M. Ortega, J. Caballero, E. Vilanova, E. Chacón, and J. Llamas. "Baseline of Soil-Atmosphere CO2 Flux in the Hontomin Site (Burgos, Spain)." In Third EAGE CO2 Geological Storage Workshop. Netherlands: EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20143803.
Full textKozlov, Boris, Dmitry Makhan'ko, and Mai The Nguyen. "Volume Discharges in CO2-Laser Mixtures at Atmospheric Pressures With High Energy Density." In 2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE). IEEE, 2020. http://dx.doi.org/10.1109/efre47760.2020.9242065.
Full textGARCIA, C., C. A. HABERT, and C. P. BORGES. "CO2 CAPTURE FROM FLUE GAS USING MEMBRANE CONTACTORS." In XXII Congresso Brasileiro de Engenharia Química. São Paulo: Editora Blucher, 2018. http://dx.doi.org/10.5151/cobeq2018-co.067.
Full textJiang, Pei-Xue, Zhi-Hui Li, and Chen-Ru Zhao. "Convection Heat Transfer of CO2 at Supercritical Pressures in a Vertical Mini Tube." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18343.
Full textZhu, Min, Fangfang Wu, Heng Ma, Shuqun Wu, and Chaohai Zhang. "Introduction of Al2O3 Rods into DBD for CO2 Conversion: Understanding the Synergistic Effect of Plasma-Catalysis." In 2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE). IEEE, 2020. http://dx.doi.org/10.1109/efre47760.2020.9241992.
Full textZada, Kyle R., M. Kevin Drost, and Brian M. Fronk. "Application of Microscale Devices for Megawatt Scale Concentrating Solar Power Plants." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52529.
Full textReports on the topic "CO2 fluxe"
Lisa L. Robbins and Kimberly K. Yates. Direct Measurement of CO2 Fluxes in Marine Whitings. Office of Scientific and Technical Information (OSTI), July 2001. http://dx.doi.org/10.2172/859282.
Full textMichael C. Trachtenberg. Biomimetic Membrane for CO2 Capture from Flue Gas. Office of Scientific and Technical Information (OSTI), May 2007. http://dx.doi.org/10.2172/926669.
Full textLiang Hu. CO2 Capture from Flue Gas by Phase Transitional Absorption. Office of Scientific and Technical Information (OSTI), June 2009. http://dx.doi.org/10.2172/975092.
Full textTanny, Josef, Gabriel Katul, Shabtai Cohen, and Meir Teitel. Application of Turbulent Transport Techniques for Quantifying Whole Canopy Evapotranspiration in Large Agricultural Structures: Measurement and Theory. United States Department of Agriculture, January 2011. http://dx.doi.org/10.32747/2011.7592121.bard.
Full textTim Merkel, Karl Amo, Richard Baker, Ramin Daniels, Bilgen Friat, Zhenjie He, Haiqing Lin, and Adrian Serbanescu. MEMBRANE PROCESS TO SEQUESTER CO2 FROM POWER PLANT FLUE GAS. Office of Scientific and Technical Information (OSTI), March 2009. http://dx.doi.org/10.2172/1015458.
Full textTsouris, Costas, Gerilynn Moline, and Douglas Aaron. Separation of CO2 from Flue Gas and Potential for Geologic Sequestration. Office of Scientific and Technical Information (OSTI), December 2022. http://dx.doi.org/10.2172/1902800.
Full textFung, Inez. Final report on "Modeling Diurnal Variations of California Land Biosphere CO2 Fluxes". Office of Scientific and Technical Information (OSTI), July 2014. http://dx.doi.org/10.2172/1147169.
Full textKeller, Jason, Scott Bridgham, and Qianlai Zhuang. UNDERSTANDING MECHANISTIC CONTROLS OF HETEROTROPHIC CO2 AND CH4 FLUXES IN A PEATLAND WITH DEEP SOIL WARMING AND ATMOSPHERIC CO2 ENRICHMENT. Office of Scientific and Technical Information (OSTI), April 2021. http://dx.doi.org/10.2172/1778095.
Full textAndrews, Rodney. SEPARATION OF CO2 FROM FLUE GASES BY CARBON-MULTIWALL CARBON NANOTUBE MEMBRANES. Office of Scientific and Technical Information (OSTI), March 2001. http://dx.doi.org/10.2172/788129.
Full textAndrews, Rodney. SEPARATION OF CO2 FROM FLUE GASES BY CARBON-MULTIWALL CARBON NANOTUBE MEMBRANES. Office of Scientific and Technical Information (OSTI), November 2001. http://dx.doi.org/10.2172/792162.
Full text