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Potential indirect effects of aerosol on tropical cyclone development

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dc.contributor.authorKrall, Geoffrey Michael, author
dc.contributor.authorCotton, William R., advisor
dc.contributor.authorvan den Heever, Susan C., committee member
dc.contributor.authorEykholt, Richard Eric, 1956-, committee member
dc.coverage.spatialTropics
dc.coverage.temporal2008
dc.date.accessioned2007-01-03T04:52:25Z
dc.date.available2007-01-03T04:52:25Z
dc.date.issued2010
dc.description.abstractObservational and model evidence suggest that a 2008 Western Pacific typhoon (NURI) came into contact with and ingested elevated concentrations of aerosol as it neared the Chinese coast. This study uses a regional model with two-moment bin emulating microphysics to simulate the typhoon as it enters the field of elevated aerosol concentration. A continental field of cloud condensation nuclei (CCN) was prescribed based on satellite and global aerosol model output, then increased for further sensitivity tests. The typhoon was simulated for 96 hours beginning 17 August 2008, the final 60 of which were under varying CCN concentrations as it neared the Philippines and coastal China. The model was initialized with both global reanalysis model data and irregularly spaced dropsonde data from a 2008 observational campaign using an objective analysis routine. At 36 hours, the internal nudging of the model was switched off and allowed to evolve on its own. As the typhoon entered the field of elevated CCN in the sensitivity tests, the presence of additional CCN resulted in a significant perturbation of windspeed, convective fluxes, and hydrometeor species behavior. Initially ingested in the outer rainbands of the storm, the additional CCN resulted in an initial damping and subsequent invigoration of convection. The increase in convective fluxes strongly lag-correlates with increased amounts of supercooled liquid water within the storm domain. As the convection intensified in the outer rainbands the storm drifted over the developing cold-pools, affecting the inflow of air into the convective towers of the typhoon. Changes in the timing and amount of rain produced in each simulation resulted in differing cold-pool strengths and size. The presence of additional CCN increased resulted in an amplification of convection within the storm, except for the extremely high CCN concentration simulation, which showed a damped convection due to the advection of pristine ice away from the storm. This study examines the physical mechanisms that could potentially alter a tropical cyclone (TC) in intensity and dynamics upon ingesting elevated levels of CCN.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierKrall_colostate_0053N_10192.pdf
dc.identifierETDF2010200113ATMS
dc.identifier.urihttp://hdl.handle.net/10217/44964
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectaerosol
dc.subjecttropical cyclone
dc.subjectatmospheric modeling
dc.subject.lcshAtmospheric aerosols
dc.subject.lcshAtmospheric models
dc.subject.lcshCyclones -- Tropics
dc.titlePotential indirect effects of aerosol on tropical cyclone development
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineAtmospheric Science
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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