Evaluation of the influence of aerosols on radiative processes and turbulent surface flows within the Aburrá Valley

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dc.contributor.advisorHoyos, Carlos Davidspa
dc.contributor.advisorHerrera Mejía, Lauraspa
dc.contributor.authorRoldán Henao, Nataliaspa
dc.date.accessioned2021-02-25T21:00:10Zspa
dc.date.available2021-02-25T21:00:10Zspa
dc.date.issued2020-11-20spa
dc.description.abstractEl Valle de Aburrá, un valle densamente poblado ubicado en Colombia, con una topografía de alta complejidad en la cordillera de los Andes, ha experimentado en los últimos cinco años la aparición de episodios críticos de contaminación atmosférica, caracterizados por un aumento en la concentración de aerosoles. Este estudio combina información en tierra y satelital para estudiar los impactos de los aerosoles troposféricos en la radiación, los flujos de energía, capa límite atmosférica, propiedades de las nubes y precipitación en la escala local (Valle de Aburrá) y regional (Colombia). En el valle de Aburrá, la dispersión y absorción de los aerosoles disminuyen la radiación en superficie hasta más de -40 W/m2; adicionalmente inhiben los flujos de calor latente y sensible, modificando de esta forma la evolución de la capa límite atmosférica. En Colombia, los efectos de los aerosoles están relacionados con los eventos de quema de biomasa que ocurren anualmente en el norte y el este de Colombia. Dado que cada gota de nube necesita una partícula de aerosol (un núcleo de condensación de la nube) para su activación, los aerosoles en Colombia y el Valle también han modificado las propiedades de las nubes. Este estudio encontró reducciones en el tamaño de las gotas de nubes para diferentes tipos de nubes. También investigamos los impactos de los aerosoles en la nube convectivas, y llegamos a la conclusión de que el proceso de difusión podría retrasarse durante episodios de alta concentración de aerosoles. Evaluamos las interacciones aerosoles-nube-precipitación, encontrando un aumento en los eventos de lluvia por la tarde debido a la presencia de aerosoles. Las modificaciones resultantes en las propiedades meteorológicas del Valle de Aburrá podrían inducir retroalimentaciones positivas que conducirían a mayores aumentos en la concentración de contaminantes.spa
dc.description.abstractThe Aburrá Valley, a densely populated valley in Colombia, with highly complex topography at the Andes mountain range, has experienced during the past five years the onset of several critical air pollution episodes, which are characterized by an increase in aerosol concentration. This study combines ground-based and satellite information to study aerosols' impacts on radiation, energy fluxes, atmospheric boundary layer, clouds properties, and precipitation in a local (Aburrá Valley) and regional (Colombia) scale. In the Aburrá Valley, aerosols' scattering and absorption diminish the surface radiation by as much as -40 W/m2; they also inhibit the latent and sensible heat fluxes, thus modifying the evolution of the boundary layer. In Colombia, aerosols' effects are linked to the biomass burning events that annually occur to the north and to the east of Colombia. Since every cloud droplet needs an aerosol particle (a cloud condensation nuclei) for activation, aerosols in Colombia and in the Valley have also modified the cloud properties. This study found reductions in cloud droplets' size for different cloud types. We investigated aerosols' impacts on convective clouds, concluding that the diffusion process could be retarded during high aerosol concentration episodes. We assessed the aerosols-cloud-precipitation interactions, finding an increase in afternoon-rainfall events due to aerosols' presence. The resultant modifications in the Aburrá Valley's meteorological properties could induce a positive feedback that leads to greater increases in pollutants' concentration.spa
dc.description.additionalLínea de investigación: Hidroclimatología, Calidad del airespa
dc.description.degreelevelMaestríaspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/79310
dc.language.isoengspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Medellínspa
dc.publisher.departmentDepartamento de Geociencias y Medo Ambientespa
dc.publisher.programMedellín - Minas - Maestría en Ingeniería - Recursos Hidráulicosspa
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dc.rightsDerechos reservados - Universidad Nacional de Colombiaspa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-SinDerivadas 4.0 Internacionalspa
dc.rights.licenseAtribución-SinDerivadas 4.0 Internacionalspa
dc.rights.spaAcceso abiertospa
dc.rights.urihttp://creativecommons.org/licenses/by-nd/4.0/spa
dc.subject.ddc620 - Ingeniería y operaciones afines::627 - Ingeniería hidráulicaspa
dc.subject.proposalaerosolseng
dc.subject.proposalaerosolesspa
dc.subject.proposalatmospheric boundary layereng
dc.subject.proposalcapa límite atmosféricaspa
dc.subject.proposalmeteorologíaspa
dc.subject.proposalmeteorologyeng
dc.subject.proposalradiationeng
dc.subject.proposalradiaciónspa
dc.subject.proposalabsorptioneng
dc.subject.proposalabsorciónspa
dc.subject.proposalscatteringeng
dc.subject.proposaldispersiónspa
dc.subject.proposalcloud condensation nucleiseng
dc.subject.proposalnúcleos de condensación de nubesspa
dc.subject.proposalContamination - Valle de Aburrá (Antioquia, Colombia)eng
dc.subject.proposalContaminación industrial - Valle de Aburrá (Antioquia, Colombia)spa
dc.titleEvaluation of the influence of aerosols on radiative processes and turbulent surface flows within the Aburrá Valleyspa
dc.title.alternativeEvaluación de la influencia de aerosoles en procesos radiativos y flujos superficiales turbulentos dentro del Valle de Aburráspa
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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