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dc.contributor.author
Fernández, Rafael Pedro  
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Barrera, Javier Alejandro  
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Iglesias Suarez, Fernando  
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Cuevas, Carlos Alberto  
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Kinnison, Douglas E.  
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Lamarque, Jean Francoise  
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Tilmes, Simone  
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Wales, Pamela  
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Nicely, Julie M.  
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Salawitch, Ross J.  
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Saiz Lopez, Alfonso  
dc.date.available
2022-04-07T11:39:29Z  
dc.date.issued
2019  
dc.identifier.citation
Tropospheric Chemical Impact of Considering a Surrogate vs. an Explicit VSLBr Mechanism on the O3 and HOx Distributions within the CAM-Chem model; EGU General Assembly 2019; Viena; Austria; 2019; 1-1  
dc.identifier.uri
http://hdl.handle.net/11336/154566  
dc.description.abstract
The contribution of very short-lived bromine (VSLBr) represent 5 ± 2 ppt (∼25%) of total stratospheric bromine (WMO, 2018), which is still nowadays dominated by long-lived bromocarbons that do not impact on tropospheric chemistry. Due to their shorter lifetimes, the overall injection to the stratosphere of VSLBr compounds possesses two distinct pathways: i) Source Gas Injection (SGI), where the brominated species are injected as they were emitted at the surface; and ii) Product Gas Injection (PGI), where the photochemical processing of reactive species arising from SG degradation must be considered. Depending on the partitioning and distribution of SGI and PGI, the chemical impact of VSLBr on tropospheric and lowermost stratospheric ozone, HOx and other oxidizing species can be very different. Many Chemistry Climate Models (CCMs) include a simplified treatment of tropospheric VSLBr sources by assuming a long-lived halocarbon (usually CH3Br) as a Surrogate for VSLBr. Even though these surrogate models possess a consistent evolution of the stratospheric bromine loading, CCMs including an explicit VSLBr representation compare better with organic and inorganic bromine observations in the lowermost stratosphere (Wales et al., 2018). Here we used the halogenated version of the CAM-Chem model (Fernandez et al., 2014) to evaluate the chemical impact of considering an explicit treatment of VSLBr versus considering a simplified tropospheric treatment of long-lived CH3Br as surrogate of VSLBr. The explicit mechanism considers a full gas- and aerosol- phase chemical scheme (including sea-salt dehalogenation) as well as time dependent and geographically-distributed VSLBr emissions inventory (Ordoñez et al., 2012), which replaces the typical lower-boundary surface conditions for longlived compounds usually considered in CCMs. An additional baseline simulation neglecting the contribution of VSLBr is also considered. First we show the differences in the overall inorganic bromine (Bry) burden as a function of altitude, latitude and time of the year, and compare the model changes on SGI and PGI for each model configuration. Based on the vertical and latitudinal Bry distributions, we focus the analysis on determining the surrogate vs. explicit VSLBr impact on the tropospheric ozone burden, as well as the changes in HOx and NOx mixing ratios within different regions. In particular, seasonal variations in the Odd-Oxygen chemical loss channels during within the marine boundary layer (MBL), tropical tropopause layer (TTL) and mid-latitudes upper troposphere (UT) are evaluated. Our results indicate that the impact of VSLBr species is strongly underestimated when a simplified treatment of tropospheric VSLBr chemistry is considered, which might have strong climatic impacts.  
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application/pdf  
dc.language.iso
eng  
dc.publisher
Copernicus Publications  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/  
dc.subject
VSLBr Mechanism  
dc.subject
CAM-Chem model  
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Surrogate vs. an Explicit  
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Investigación Climatológica  
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Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Tropospheric Chemical Impact of Considering a Surrogate vs. an Explicit VSLBr Mechanism on the O3 and HOx Distributions within the CAM-Chem model  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.type
info:eu-repo/semantics/conferenceObject  
dc.type
info:ar-repo/semantics/documento de conferencia  
dc.date.updated
2022-03-16T20:58:40Z  
dc.journal.volume
21  
dc.journal.pagination
1-1  
dc.journal.pais
Austria  
dc.journal.ciudad
Viena  
dc.description.fil
Fil: Fernández, Rafael Pedro. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina. Consejo Superior de Investigaciones Científicas. Instituto de Química Física; España. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza; Argentina  
dc.description.fil
Fil: Barrera, Javier Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza; Argentina. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina  
dc.description.fil
Fil: Iglesias Suarez, Fernando. Consejo Superior de Investigaciones Científicas. Instituto de Química Física; España  
dc.description.fil
Fil: Cuevas, Carlos Alberto. Consejo Superior de Investigaciones Científicas. Instituto de Química Física; España  
dc.description.fil
Fil: Kinnison, Douglas E.. No especifíca;  
dc.description.fil
Fil: Lamarque, Jean Francoise. No especifíca;  
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Fil: Tilmes, Simone. No especifíca;  
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Fil: Wales, Pamela. University of Maryland; Estados Unidos  
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Fil: Nicely, Julie M.. No especifíca;  
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Fil: Salawitch, Ross J.. University of Maryland; Estados Unidos  
dc.description.fil
Fil: Saiz Lopez, Alfonso. Consejo Superior de Investigaciones Científicas. Instituto de Química Física; España. University of Maryland; Estados Unidos  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://meetingorganizer.copernicus.org/EGU2019/EGU2019-9247.pdf  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://meetingorganizer.copernicus.org/EGU2019/sessionprogramme/PS  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.geophysical-research-abstracts.net/  
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Autor  
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Autor  
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Autor  
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Autor  
dc.coverage
Internacional  
dc.type.subtype
Congreso  
dc.description.nombreEvento
EGU General Assembly 2019  
dc.date.evento
2019-04-07  
dc.description.ciudadEvento
Viena  
dc.description.paisEvento
Austria  
dc.type.publicacion
Journal  
dc.description.institucionOrganizadora
European Geosciences Union  
dc.source.revista
Geophysical Research Abstracts  
dc.type
Congreso