Profiling of CH4 background mixing ratio in the lower troposphere with Raman lidar

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dc.contributor.authorVESELOVSKII, IGORpt_BR
dc.contributor.authorGOLOUB, PHILIPPEpt_BR
dc.contributor.authorHU, QIAOYUNpt_BR
dc.contributor.authorPODVIN, THIERRYpt_BR
dc.contributor.authorWHITEMAN, DAVID N.pt_BR
dc.contributor.authorKORENSKIY, MIKHAELpt_BR
dc.contributor.authorLANDULFO, EDUARDOpt_BR
dc.coverageInternacionalpt_BR
dc.date.accessioned2019-08-05T13:33:15Z
dc.date.available2019-08-05T13:33:15Z
dc.date.issued2019pt_BR
dc.description.abstractWe present the results of methane profiling in the lower troposphere using LILAS Raman lidar from the Lille University observatory platform (France). The lidar is based on a frequency-tripled Nd:YAG laser, and nighttime profiling up to 4000 with 100m height resolution is possible for methane. Agreement between the measured photoncounting rate in the CH4 Raman channel in the free troposphere and numerical simulations for a typical CH4 background mixing ratio (2 ppm) confirms that CH4 Raman scattering is detected. The mixing ratio is calculated from the ratio of methane (395.7 nm) and nitrogen (386.7 nm) Raman backscatters, and within the planetary boundary layer, an increase of the CH4 mixing ratio, up to a factor of 2, is observed. Different possible interfering factors, such as leakage of the elastic signal and aerosol fluorescence, have been taken into consideration. Tests using backscattering from clouds confirmed that the filters in the Raman channel provide sufficient rejection of elastic scattering. The measured methane profiles do not correlate with aerosol backscattering, which corroborates the hypothesis that, in the planetary boundary layer, not aerosol fluorescence but CH4 is observed. However, the fluorescence contribution cannot be completely excluded and, for future measurements, we plan to install an additional control channel close to 393 nm, where no strong Raman lines exist and only fluorescence can be observed.pt_BR
dc.format.extent119-128pt_BR
dc.identifier.citationVESELOVSKII, IGOR; GOLOUB, PHILIPPE; HU, QIAOYUN; PODVIN, THIERRY; WHITEMAN, DAVID N.; KORENSKIY, MIKHAEL; LANDULFO, EDUARDO. Profiling of CH4 background mixing ratio in the lower troposphere with Raman lidar: a feasibility experiment. <b>Atmospheric Measurement Techniques</b>, v. 12, n. 1, p. 119-128, 2019. DOI: <a href="https://dx.doi.org/10.5194/amt-12-119-2019">10.5194/amt-12-119-2019</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/30023.
dc.identifier.doi10.5194/amt-12-119-2019pt_BR
dc.identifier.fasciculo1pt_BR
dc.identifier.issn1867-1381pt_BR
dc.identifier.orcid0000-0002-9691-5306pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-9691-5306
dc.identifier.percentilfi71.505pt_BR
dc.identifier.percentilfiCiteScore82.00
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/30023
dc.identifier.vol12pt_BR
dc.relation.ispartofAtmospheric Measurement Techniquespt_BR
dc.rightsopenAccesspt_BR
dc.subjectraman spectroscopy
dc.subjectoptical radar
dc.subjecttroposphere
dc.subjectmethane
dc.subjectfeasibility studies
dc.titleProfiling of CH4 background mixing ratio in the lower troposphere with Raman lidarpt_BR
dc.typeArtigo de periódicopt_BR
dspace.entity.typePublication
ipen.autorEDUARDO LANDULFO
ipen.codigoautor503
ipen.contributor.ipenauthorEDUARDO LANDULFO
ipen.date.recebimento19-08
ipen.identifier.fi3.668pt_BR
ipen.identifier.fiCiteScore6.3
ipen.identifier.ipendoc25815pt_BR
ipen.identifier.iwosWoSpt_BR
ipen.range.fi3.000 - 4.499
ipen.range.percentilfi50.00 - 74.99
ipen.subtituloa feasibility experimentpt_BR
ipen.type.genreArtigo
relation.isAuthorOfPublicatione4dff370-e8c1-4437-846a-ef18a3ad606b
relation.isAuthorOfPublication.latestForDiscoverye4dff370-e8c1-4437-846a-ef18a3ad606b
sigepi.autor.atividadeLANDULFO, EDUARDO:503:920:Npt_BR
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