Determination of CH4 in mangrove area using LIDAR Raman and Cavity Ringdown Laser Spectroscopy
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2019
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SP SCHOOL OF ADVANCED SCIENCE ON ATMOSPHERIC AEROSOLS
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Natural wetlands are considered important sources of atmospheric methane, and several researchers
have attempted to quantify global emissions from wetland environments. Therefore, this project
was conducted an experimental data sample in Itanhaém region, which explored the spatial
variability of methane flow within a system with no anthropogenic wetland impact known as
mangrove. The study area is located in the coastal region of São Paulo state, region of Atlantic
Forest preservation, with large mangrove area. Since remote sensing is a method non-invasive, we
were able to detect the emission of methane in areas that do not undergo human intervention,
estimating the release of natural gas. The Lidar Raman method reduce the complexity system
and cost of mobile and real-time analytics. The 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. For an exchange and precision data
the Cavity Ringdown Laser Spectroscopy (CRDS) was used functioned with light absorbing at
specific wavelengths and its ability to detect mole fractions in ppt (part per trillion) detecting small
amounts of gases. Advances in CRDS in cavity-enhanced absorption spectroscopy techniques
provide dramatic increases in optical path length and, as a result, allow ultra-sensitive trace
gas measurements using robust, reliable and near-infrared temperature room-temperature diode
lasers. The results indicated that the spatial variability of the flow within a wetland ecosystem can
introduce significant results when compared to areas with impacts with fugitive gases, as well as
in extrapolations to larger areas, even if the extension of the ecosystem is well known.
Como referenciar
CORREA, T. Determination of CH4 in mangrove area using LIDAR Raman and Cavity Ringdown Laser Spectroscopy. In: SP SCHOOL OF ADVANCED SCIENCE ON ATMOSPHERIC AEROSOLS, July 22 - August 2, 2019, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Física - USP, 2019. p. 79-79. Disponível em: http://repositorio.ipen.br/handle/123456789/32217. Acesso em: 26 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.