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dc.contributor.author
Palancar, Gustavo Gerardo
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dc.contributor.author
Lefer, B. L.
dc.contributor.author
Hall, S. R.
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Shaw, W. J.
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Corr, C. A.
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Herndon, S. C.
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Slusser, J. R.
dc.contributor.author
Madronich, S.
dc.date.available
2016-12-26T13:36:06Z
dc.date.issued
2013-01
dc.identifier.citation
Palancar, Gustavo Gerardo; Lefer, B. L.; Hall, S. R. ; Shaw, W. J.; Corr, C. A. ; et al.; Effect of aerosols and NO2 concentration on ultraviolet actinic flux near Mexico City during MILAGRO: measurements and model calculations; Copernicus Publications; Atmospheric Chemistry and Physics; 13; 1-2013; 1011-1022
dc.identifier.issn
1680-7316
dc.identifier.uri
http://hdl.handle.net/11336/10044
dc.description.abstract
Urban air pollution absorbs and scatters solar ultraviolet (UV) radiation, and thus has a potentially large effect on tropospheric photochemical rates. We present the first detailed comparison between actinic fluxes (AF) in the wavelength range 330–420 nm measured in highly polluted conditions and simulated with the Tropospheric UltravioletVisible (TUV) model. Measurements were made during the MILAGRO campaign near Mexico City in March 2006, at a ground-based station near Mexico City (the T1 supersite) and from the NSF/NCAR C-130 aircraft. At the surface, measured AF values are typically smaller than the model by up to 25 % in the morning, 10 % at noon, and 40 % in the afternoon, for pollution-free and cloud-free conditions. When measurements of PBL height, NO2 concentration and aerosols optical properties are included in the model, the agreement improves to within ±10 % in the morning and afternoon, and ±3 % at noon. Based on daily averages, aerosols account for 68 % and NO2 for 25 % of AF reductions observed at the surface. Several overpasses from the C-130 aircraft provided the opportunity to examine the AF perturbations aloft, and also show better agreement with the model when aerosol and NO2 effects are included above and below the flight altitude. TUV model simulations show that the vertical structure of the actinic flux is sensitive to the choice of the aerosol single scattering albedo (SSA) at UV wavelengths. Typically, aerosols enhance AF above the PBL and reduce AF near the surface. However, for highly scattering aerosols (SSA > 0.95), enhancements can penetrate well into the PBL, while for strongly absorbing aerosols (SSA < 0.6) reductions in AF are computed in the free troposphere as well as in the PBL. Additional measurements of the SSA at these wavelengths are needed to better constrain the effect of aerosols on the vertical structure of the AF.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Copernicus Publications
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Actinic Flux
dc.subject
México City
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Milagro Campaign
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Aerosols And No2 Concentration
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Effect of aerosols and NO2 concentration on ultraviolet actinic flux near Mexico City during MILAGRO: measurements and model calculations
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-12-19T18:05:37Z
dc.identifier.eissn
1680-7324
dc.journal.volume
13
dc.journal.pagination
1011-1022
dc.journal.pais
Alemania
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dc.journal.ciudad
Gottingen
dc.description.fil
Fil: Palancar, Gustavo Gerardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto de Investigaciones en Físicoquímica de Córdoba; Argentina. National Center For Atmospheric Research. Amospheric Chemistry Division; Estados Unidos
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Fil: Lefer, B. L.. University Of Houston; Estados Unidos
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Fil: Hall, S. R. . National Center For Atmospheric Research. Amospheric Chemistry Division; Estados Unidos
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Fil: Shaw, W. J.. Department of Energy. Pacific Northwest National Laboratory; Estados Unidos
dc.description.fil
Fil: Corr, C. A. . Earth Systems Research Center. University of New Hampshire; Estados Unidos
dc.description.fil
Fil: Herndon, S. C. . Aerodyne Research Inc.; Estados Unidos
dc.description.fil
Fil: Slusser, J. R.. UV-B Monitoring And Research Program, USDA, Colorado State University; Estados Unidos
dc.description.fil
Fil: Madronich, S. . National Center For Atmospheric Research. Amospheric Chemistry Division; Estados Unidos
dc.journal.title
Atmospheric Chemistry and Physics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.atmos-chem-phys.net/13/1011/2013/acp-13-1011-2013.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.5194/acp-13-1011-2013
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