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dc.contributor.authorEgan, Sean D.
dc.date.accessioned2020-02-13T18:23:36Z
dc.date.available2020-02-13T18:23:36Z
dc.date.issued2019-12
dc.identifier.urihttp://hdl.handle.net/11122/10895
dc.descriptionThesis (Ph.D.) University of Alaska Fairbanks, 2019en_US
dc.description.abstractThe Weather Research Forecasting with Chemistry (WRF-Chem) model is capable of modeling volcanic emissions of ash, sulfur dioxide and water vapor. Here, it is applied to eruptions from three volcanoes: the 2008 eruption of Kasatochi Volcano in Alaska, the 2010 eruption of Eyjafjallajökull in Iceland and the 2019 eruption of Raikoke in the Kurile Islands. WRF-Chem's ability to model volcanic emissions dispersion is validated through comparison of model output to remote sensing, in situ and field measurements. A sensitivity of the model to modeled plume height is discussed. This work also modifies the base WRF-Chem code in three ways and studies the effects of these modifications. First, volcanic ash aggregation parameterizations are added covering three modes of particle collisions through Brownian motion, differential settling and shear. Second, water vapor emissions from volcanic eruptions are added and coupled to the new aggregation scheme. The effects of these changes are assessed and found to produce volcanic ash concentrations in agreement with in situ measurements of plume concentrations and field measurements of tephra fallout. Third, the model is adapted to include multiple model initializations such that each is perturbed by selecting between two volcanic ash particle sizes and five initial plume heights. This modified WRF-Chem is nested in an application program interface that enables a new, automated, near real-time capability. This capability is assessed and the feasibility of its use as an augmenting tool to current operational VATD models is commented upon.en_US
dc.language.isoen_USen_US
dc.subjectvolcanic gasesen_US
dc.subjectmodelsen_US
dc.subjectvolcanic plumesen_US
dc.subjectvolcanic ashen_US
dc.subjectvolcanic eruptionsen_US
dc.subjectKasatochi Volcanoen_US
dc.subjectEyjafjallajökull Volcanoen_US
dc.subjectIcelanden_US
dc.subjectRaikoke Volcanoen_US
dc.subjectKuril Islandsen_US
dc.titleModeling volcanic ash and sulfur dioxide with the Weather Research Forecasting with Chemistry (WRF-Chem) modelen_US
dc.typeThesisen_US
dc.type.degreephden_US
dc.identifier.departmentDepartment of Chemistryen_US
dc.contributor.chairCahill, Catherine
dc.contributor.chairStuefer, Martin
dc.contributor.committeeWebley, Peter
dc.contributor.committeeLopez, Taryn
dc.contributor.committeeSimpson, William
refterms.dateFOA2020-02-13T18:23:36Z


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