Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements

Autores
Palancar, Gustavo Gerardo; Shetter, R. E.; Hall, Samuel R.; Toselli, Beatriz Margarita; Madronich, S.
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Ultraviolet (UV) actinic fluxes measured with two Scanning Actinic Flux Spectroradiometers (SAFS) aboard the NASA DC-8 aircraft are compared with the Tropospheric Ultraviolet-Visible (TUV) model. The observations from 17 days in July-August 2004 (INTEX-NA field campaign) span a wide range of latitudes (28°N-53° N), longitudes (45° Wĝ€"140° W), altitudes (0.1ĝ€"11.9 km), ozone columns (285-353 DU), and solar zenith angles (2°85°). Both cloudy and cloud-free conditions were encountered. For cloud-free conditions, the ratio of observed to clear-sky-model actinic flux (integrated from 298 to 422 nm) was 1.01±0.04, i.e. in good agreement with observations. The agreement improved to 1.00±0.03 for the down-welling component under clear sky conditions. In the presence of clouds and depending on their position relative to the aircraft, the up-welling component was frequently enhanced (by as much as a factor of 8 relative to cloud-free values) while the down-welling component showed both reductions and enhancements of up to a few tens of percent. Including all conditions, the ratio of the observed actinic flux to the cloud-free model value was 1.1±0.3 for the total, or separately 1.0±0.2 for the down-welling and 1.5±0.8 for the up-welling components. The correlations between up-welling and down-welling deviations are well reproduced with sensitivity studies using the TUV model, and are understood qualitatively with a simple conceptual model. This analysis of actinic flux observations illustrates opportunities for future evaluations of photolysis rates in three-dimensional chemistry-transport models.
Fil: Palancar, Gustavo Gerardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Shetter, R. E.. National Center For Atmospheric Research. Amospheric Chemistry División; Estados Unidos
Fil: Hall, Samuel R.. National Center For Atmospheric Research. Amospheric Chemistry División; Estados Unidos
Fil: Toselli, Beatriz Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Madronich, S.. National Center For Atmospheric Research. Amospheric Chemistry División; Estados Unidos
Materia
ACTINIC FLUX
CLOUDS
AIRCRAFT MEASUREMENTS
MODEL CALCULATIONS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/82695
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurementsPalancar, Gustavo GerardoShetter, R. E.Hall, Samuel R.Toselli, Beatriz MargaritaMadronich, S.ACTINIC FLUXCLOUDSAIRCRAFT MEASUREMENTSMODEL CALCULATIONShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Ultraviolet (UV) actinic fluxes measured with two Scanning Actinic Flux Spectroradiometers (SAFS) aboard the NASA DC-8 aircraft are compared with the Tropospheric Ultraviolet-Visible (TUV) model. The observations from 17 days in July-August 2004 (INTEX-NA field campaign) span a wide range of latitudes (28°N-53° N), longitudes (45° Wĝ€"140° W), altitudes (0.1ĝ€"11.9 km), ozone columns (285-353 DU), and solar zenith angles (2°85°). Both cloudy and cloud-free conditions were encountered. For cloud-free conditions, the ratio of observed to clear-sky-model actinic flux (integrated from 298 to 422 nm) was 1.01±0.04, i.e. in good agreement with observations. The agreement improved to 1.00±0.03 for the down-welling component under clear sky conditions. In the presence of clouds and depending on their position relative to the aircraft, the up-welling component was frequently enhanced (by as much as a factor of 8 relative to cloud-free values) while the down-welling component showed both reductions and enhancements of up to a few tens of percent. Including all conditions, the ratio of the observed actinic flux to the cloud-free model value was 1.1±0.3 for the total, or separately 1.0±0.2 for the down-welling and 1.5±0.8 for the up-welling components. The correlations between up-welling and down-welling deviations are well reproduced with sensitivity studies using the TUV model, and are understood qualitatively with a simple conceptual model. This analysis of actinic flux observations illustrates opportunities for future evaluations of photolysis rates in three-dimensional chemistry-transport models.Fil: Palancar, Gustavo Gerardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Shetter, R. E.. National Center For Atmospheric Research. Amospheric Chemistry División; Estados UnidosFil: Hall, Samuel R.. National Center For Atmospheric Research. Amospheric Chemistry División; Estados UnidosFil: Toselli, Beatriz Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Madronich, S.. National Center For Atmospheric Research. Amospheric Chemistry División; Estados UnidosCopernicus Publications2011-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/82695Palancar, Gustavo Gerardo; Shetter, R. E.; Hall, Samuel R.; Toselli, Beatriz Margarita; Madronich, S.; Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements; Copernicus Publications; Atmospheric Chemistry and Physics; 11; 11; 6-2011; 5457-54691680-73161680-7324CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.atmos-chem-phys.net/11/5457/2011/acp-11-5457-2011.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.5194/acp-11-5457-2011info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:45:08Zoai:ri.conicet.gov.ar:11336/82695instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:45:08.532CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements
title Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements
spellingShingle Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements
Palancar, Gustavo Gerardo
ACTINIC FLUX
CLOUDS
AIRCRAFT MEASUREMENTS
MODEL CALCULATIONS
title_short Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements
title_full Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements
title_fullStr Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements
title_full_unstemmed Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements
title_sort Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements
dc.creator.none.fl_str_mv Palancar, Gustavo Gerardo
Shetter, R. E.
Hall, Samuel R.
Toselli, Beatriz Margarita
Madronich, S.
author Palancar, Gustavo Gerardo
author_facet Palancar, Gustavo Gerardo
Shetter, R. E.
Hall, Samuel R.
Toselli, Beatriz Margarita
Madronich, S.
author_role author
author2 Shetter, R. E.
Hall, Samuel R.
Toselli, Beatriz Margarita
Madronich, S.
author2_role author
author
author
author
dc.subject.none.fl_str_mv ACTINIC FLUX
CLOUDS
AIRCRAFT MEASUREMENTS
MODEL CALCULATIONS
topic ACTINIC FLUX
CLOUDS
AIRCRAFT MEASUREMENTS
MODEL CALCULATIONS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Ultraviolet (UV) actinic fluxes measured with two Scanning Actinic Flux Spectroradiometers (SAFS) aboard the NASA DC-8 aircraft are compared with the Tropospheric Ultraviolet-Visible (TUV) model. The observations from 17 days in July-August 2004 (INTEX-NA field campaign) span a wide range of latitudes (28°N-53° N), longitudes (45° Wĝ€"140° W), altitudes (0.1ĝ€"11.9 km), ozone columns (285-353 DU), and solar zenith angles (2°85°). Both cloudy and cloud-free conditions were encountered. For cloud-free conditions, the ratio of observed to clear-sky-model actinic flux (integrated from 298 to 422 nm) was 1.01±0.04, i.e. in good agreement with observations. The agreement improved to 1.00±0.03 for the down-welling component under clear sky conditions. In the presence of clouds and depending on their position relative to the aircraft, the up-welling component was frequently enhanced (by as much as a factor of 8 relative to cloud-free values) while the down-welling component showed both reductions and enhancements of up to a few tens of percent. Including all conditions, the ratio of the observed actinic flux to the cloud-free model value was 1.1±0.3 for the total, or separately 1.0±0.2 for the down-welling and 1.5±0.8 for the up-welling components. The correlations between up-welling and down-welling deviations are well reproduced with sensitivity studies using the TUV model, and are understood qualitatively with a simple conceptual model. This analysis of actinic flux observations illustrates opportunities for future evaluations of photolysis rates in three-dimensional chemistry-transport models.
Fil: Palancar, Gustavo Gerardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Shetter, R. E.. National Center For Atmospheric Research. Amospheric Chemistry División; Estados Unidos
Fil: Hall, Samuel R.. National Center For Atmospheric Research. Amospheric Chemistry División; Estados Unidos
Fil: Toselli, Beatriz Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Madronich, S.. National Center For Atmospheric Research. Amospheric Chemistry División; Estados Unidos
description Ultraviolet (UV) actinic fluxes measured with two Scanning Actinic Flux Spectroradiometers (SAFS) aboard the NASA DC-8 aircraft are compared with the Tropospheric Ultraviolet-Visible (TUV) model. The observations from 17 days in July-August 2004 (INTEX-NA field campaign) span a wide range of latitudes (28°N-53° N), longitudes (45° Wĝ€"140° W), altitudes (0.1ĝ€"11.9 km), ozone columns (285-353 DU), and solar zenith angles (2°85°). Both cloudy and cloud-free conditions were encountered. For cloud-free conditions, the ratio of observed to clear-sky-model actinic flux (integrated from 298 to 422 nm) was 1.01±0.04, i.e. in good agreement with observations. The agreement improved to 1.00±0.03 for the down-welling component under clear sky conditions. In the presence of clouds and depending on their position relative to the aircraft, the up-welling component was frequently enhanced (by as much as a factor of 8 relative to cloud-free values) while the down-welling component showed both reductions and enhancements of up to a few tens of percent. Including all conditions, the ratio of the observed actinic flux to the cloud-free model value was 1.1±0.3 for the total, or separately 1.0±0.2 for the down-welling and 1.5±0.8 for the up-welling components. The correlations between up-welling and down-welling deviations are well reproduced with sensitivity studies using the TUV model, and are understood qualitatively with a simple conceptual model. This analysis of actinic flux observations illustrates opportunities for future evaluations of photolysis rates in three-dimensional chemistry-transport models.
publishDate 2011
dc.date.none.fl_str_mv 2011-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/82695
Palancar, Gustavo Gerardo; Shetter, R. E.; Hall, Samuel R.; Toselli, Beatriz Margarita; Madronich, S.; Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements; Copernicus Publications; Atmospheric Chemistry and Physics; 11; 11; 6-2011; 5457-5469
1680-7316
1680-7324
CONICET Digital
CONICET
url http://hdl.handle.net/11336/82695
identifier_str_mv Palancar, Gustavo Gerardo; Shetter, R. E.; Hall, Samuel R.; Toselli, Beatriz Margarita; Madronich, S.; Ultraviolet actinic flux in clear and cloudy atmospheres: Model calculations and aircraft-based measurements; Copernicus Publications; Atmospheric Chemistry and Physics; 11; 11; 6-2011; 5457-5469
1680-7316
1680-7324
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.atmos-chem-phys.net/11/5457/2011/acp-11-5457-2011.html
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-11-5457-2011
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Copernicus Publications
publisher.none.fl_str_mv Copernicus Publications
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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