ELAINE CRISTINA ARAUJO
6 resultados
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- Carbon dioxide and methane levels in surface waters along the São Vicente island in coastal region of São Paulo state2024 - ARAUJO, ELAINE C.; ANDRADE, IZABEL S.; MACEDO, FERNANDA de M.; CORREA, THAIS; ANDRADE, THAIS; BRAGA, ELISABETE S.; ANDRADE, MARIA de F.; LANDULFO, EDUARDOVarious studies explore the relationship between the rising levels of CO2 and CH4 (greenhouse gasses) in the atmosphere and climate changes, and how these increases are connected to human activities. The escalation of these gas species may have implications for the environment. Concerning coastal systems, the rise in greenhouse gas emissions could impact the environment through multiple pathways because the atmosphere and superficial ocean waters also have significant exchanges. The main purpose of this work is to study Greenhouse gasses (GHG), such as CO2 and CH4, on the superficial waters of the coastal region of São Paulo coast. The data were collected in situ on a vessel provided by the Institute of Oceanography of São Paulo University (IOUSP). The campaign was conducted in spring 2022 (10-11 Оctober) in the south of the coast of São Paulo state, traveling through cities with anthropogenic impacts in principal Santos city, which is located the main port of Sul America. For these in situ measurements a portable gas analyzer Microportable Greenhouse Gas Analyzers (LGR-ICOS ™ GLA Series) was used to detect the CO2 and CH4 spectra through the Off-Axis Integrated Cavity Output Spectroscopy (OA-ICOS) technique.
Artigo IPEN-doc 30956 Preliminary study of greenhouse gases near to Santos and São Sebastião ports2024 - ARAUJO, ELAINE C.; ANDRADE, IZABEL da S.; CORREA, THAIS; ANDRADE, THAIS; MACEDO, FERNANDA de M.; BRAGA, ELISABETE S.; ANDRADE, MARIA de F.; LANDULFO, EDUARDOThe carbon biogeochemical cycle in nature involves the atmosphere, ocean, terrestrial and marine biota, and mineral reservoirs, with major fluxes between the atmosphere and both terrestrial biota and ocean waters. Studies link the increase of CO2 and CH4 (GHG) to climate change and anthropogenic activities. Coastal zones have a significant impact on the carbon cycle. This study examines GHG concentrations in estuary systems close to port zones, focusing on Santos and São Sebastião ports in São Paulo, Brazil. Santos Port, the largest in Latin America, and São Sebastião Port, with a petroleum terminal, can be significant contributors of GEE. A preliminary campaign measured CO2 and CH4 for 27 hours using a portable GHG analyzer on the research vessel Albacora from the University of São Paulo's Oceanographic Institute. Results showed promising GHG concentrations, with CO2 levels above 420 ppm near Santos and above 450 ppm near São Sebastião, for methane, the major concentration was ~3 ppm, but in short period of acquisitions, in the major part of traject the level was between ~1.8 - ~1.9 ppm.Artigo IPEN-doc 30947 Assessment of methane concentrations in estuarine regions on the coast of the state of São Paulo2024 - CORREA, THAIS; ANDRADE, IZABEL da S.; MACEDO, FERNANDA de M.; ARAUJO, ELAINE C.; ANDRADE, MARIA de F.; BRAGA, ELISABETE S.; LANDULFO, EDUARDOWe evaluated concentrations of atmospheric CH4, which is considered one of the main gases causing global warming. We observed methane concentrations in the Cananéia-Iguape estuarine system on the southern coast of the state of São Paulo, Brazil and in the Santos estuary, Baixada Santista region, coast of the state of São Paulo, Brazil. The south coast region is widely studied as it presents very well-preserved fauna and flora and thus offers an important background on natural emissions. Data acquisition was carried out by a portable gas analyzer (LGR-ICOSTM GLA131), this equipment has a high sensitivity in detecting the gases under study and was placed on board the research vessels Albacora and Alpha Delphini owned by the Institute of Oceanography at the University of São Paulo in campaigns that were carried out between 2021 and 2023 in specific periods. The concentrations observed during the exploratory campaigns in the estuaries on the coast of the State of São Paulo (Iguape Cananéia Estuarine-Lagunar Complex and Santos Estuary) behaved as described in the literature, regions with greater anthropic impact present higher values of methane concentrations in the atmosphere, low-impact regions have lower methane concentrations.Artigo IPEN-doc 30945 Investigating methane emissions from Landfill in the Metropolitan Region of São Paulo2024 - SILVA, THAIS A. da; ARAUJO, ELAINE C.; ANDRADE, IZABEL da S.; ANDRADE, MARIA de F.; LANDULFO, EDUARDOThis research addresses the escalating global levels of atmospheric methane, emphasizing the critical need for understanding its sources and behavior. Landfills are identified as methane super emitters, because its rates range from 1,000 to 3,000 kg/h. Focusing on the Landfill in the district of São Mateus, in the city of São Paulo, the study aims to investigate the significance of landfills in the rising methane levels, emphasizing the impact of super emitters and methane hotspots. Field campaigns conducted on February 15th and April 06th, 2023, utilized a portable greenhouse gas analyzer (ABB) to measure methane concentrations. Meteorological parameters from ERA5 and the AERMOD Modeling System were used for a comprehensive analysis. The results highlight elevated methane concentrations around the Landfill, emphasizing its role as a significant methane super emitter. The study underscores the importance of such analyses in understanding the impact of landfills on atmospheric methane levels.Artigo IPEN-doc 27050 Correlation study between air quality data and the Lidar system in Cubatao, Sao Paulo2017 - ARAUJO, ELAINE C.; ANDRADE, IZABEL da S.; MACEDO, FERNANDA de M.; CORREA, THAIS; SALANI, MARIA H.G. de A.; COSTA, RENATA F. da; RAMOS, SERGIANA dos P.; MARQUES, MARCIA T.A.; LOPES, DANIEL S.; GUARDANI, MARIA L.G.; LANDULFO, EDUARDO; GUARDANI, ROBERTOWe present here the results of two methods with a scanning multiwavelength elastic lidar system and Beta Ray method (CETESB) realized in an industrial area. The objective is a comparer of these two methods to identify fixed sources of aerosol and to monitor plume dispersion. The results of the two aligned techniques indicate that can provide information on the concentration, spatial and temporal distribution of aerosol.Artigo IPEN-doc 26790 Correlation between two different real time data acquisition systems2019 - MACEDO, FERNANDA M.; CORREA, THAIS; ARAUJO, ELAINE; ANDRADE, IZABEL; ARLEQUES, ANTONIO G.; MIRANDA, JULIANA T. de M.; SILVA, JONATAN da; GUARDANI, ROBERTO; VESELOVSKII, IGOR; LANDULFO, EDUARDOFugitive emissions, defined as unintended or irregular leaks of gases and vapors, these are an important source of pollutants to the atmosphere, which is difficult to monitor and control. These sources are present in different sites, including megacities like São Paulo that are growing in size and economic activity. At the same time, there is a remarkable growth in concerns about the environmental issues associated with these activities. In a constantly changing world, with increasing concentrations of greenhouse gases (GHGs), among them methane (CH4) and volatile organic compounds (VOC), mitigation of atmospheric emission of these gases to contain global warming, make field campaigns in the metropolitan region of São Paulo very relevant. Optical remote sensing techniques as lidar can attend the need for real time and trustable information on fugitive emissions. The Cavity Ringdown Laser Spectroscopy (CRDS) technique was adopted because it is widely used in the detection of gas samples that absorb light at specific wavelengths and also for their ability to detect mole fractions up to the parts per trillion level. The Raman lidar system used includes a commercial laser pulsed Nd:YAG Quantel S.A., model CFR 200, with wavelengths of 355 nm, 353 nm and 396 nm, 120 mJ pulse power, with laser repetition rate of 20 Hz and pulse width of 20 s, with a spatial resolution of 7,5 m. The system includes an ethernet interface, used together with LabView software to control the measurement and readout of the acquired data. The mixing ratio of CH4 can be observed within the planetary boundary layer. The measured methane profiles correlate with the acquisitions made with the CRDS, however, an additional contribution of control data in which the Raman lines detect with high sensitivity.