Multi-Frequency Microwave Interactions of Snow-Covered Arctic First-Year Sea Ice

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dc.contributor.advisorYackel, John J.
dc.contributor.authorNanda Kumar Sreeletha, Vishnu Nandan
dc.contributor.committeememberElse, Brent G. T.
dc.contributor.committeememberHall-Beyer, Mryka C.
dc.contributor.committeememberKim, Jeong Woo
dc.contributor.committeememberTonboe, Rasmus Tage
dc.date2018-11
dc.date.accessioned2018-08-21T21:20:46Z
dc.date.available2018-08-21T21:20:46Z
dc.date.issued2018-08-20
dc.description.abstractIn this thesis, the thermophysical, dielectric and Ku-, X- and C-band polarimetric microwave properties of relatively smooth snow covered first-year sea ice (FYI), from late-winter to pre-early melt onset thermodynamic regime are investigated. Fully-polarimetric microwave backscatter data acquired from a unique, surface-based multi-frequency (Ku-, X- and C-band) scatterometer system is used near-coincident with in situ snow thermophysical measurements, to investigate thermodynamic and electrical state of snow covered FYI. Using a first-order microwave backscatter model, a multi-frequency framework is theoretically established to determine the dominant snow thermophysical properties sensitive to the modeled microwave backscatter, at Ku-, X- and C-band frequencies. Multi-frequency microwave observations acquired from the scatterometer system are then used to inter-compare with modeled backscatter, to investigate the potential of the surface-based system to determine the thermodynamic and electrical state of snow covered FYI, at diurnal and temporal scales, from late-winter to pre-early melt onset. A unique frequency-dependent polarimetric parameter is developed to characterize frequency-dependent changes in microwave backscatter, as a function of snow thickness, polarization and incidence angle. Theoretical and observational findings indicate significant influence of snow salinity affecting microwave propagation through snow covers on FYI, for all three frequencies. These findings are utilized semi-empirically to develop a thickness-dependent snow salinity correction factor to improve FYI freeboard and thickness measurement retrievals from space-borne radar altimeters, operating at Ku-band.en_US
dc.identifier.citationNanda Kumar Sreeletha, V. N. (2018). Multi-Frequency Microwave Interactions of Snow-Covered Arctic First-Year Sea Ice (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/32826en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/32826
dc.identifier.urihttp://hdl.handle.net/1880/107646
dc.language.isoeng
dc.publisher.facultyArts
dc.publisher.facultyGraduate Studies
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subjectRemote Sensing
dc.subjectSea Ice
dc.subjectArctic
dc.subjectSnow
dc.subjectRadar
dc.subjectClimate
dc.subject.classificationGeographyen_US
dc.subject.classificationOceanographyen_US
dc.subject.classificationRemote Sensingen_US
dc.titleMulti-Frequency Microwave Interactions of Snow-Covered Arctic First-Year Sea Ice
dc.typedoctoral thesis
thesis.degree.disciplineGeography
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.item.requestcopytrue
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