Meltwater Retention and Refreezing Processes in Glacier Snow and Firn
| dc.contributor.advisor | Marshall, Shawn | |
| dc.contributor.author | samimi, samira | |
| dc.contributor.committeemember | Else, Brent | |
| dc.contributor.committeemember | MacFerrin, Michael | |
| dc.contributor.committeemember | Moorman, Brian J | |
| dc.contributor.committeemember | Pietroniro, Alain | |
| dc.contributor.committeemember | Rennermalm, Asa K | |
| dc.date | 2022-02 | |
| dc.date.accessioned | 2022-01-18T15:55:58Z | |
| dc.date.available | 2022-01-18T15:55:58Z | |
| dc.date.issued | 2020-01-14 | |
| dc.description.abstract | Glacier mass losses from all the regions of the world are a strong indication of global warming. The sum of glacier and ice sheet contributions is the dominant source of global sea level rise over the past two decades, and mass loss from the Greenland Ice Sheet is increasing due to significant increases in surface melt and runoff. A fraction of summer meltwater is retained as liquid water or refrozen ice as meltwater percolates into cold (sub-zero) underlying snow and firn, which helps to reduce the summer runoff. However, there are challenges to quantifying both infiltration and refreezing of meltwater in heterogeneous snow and firn and to understanding the spatial variability of these processes. In this study, I introduce a new method to continuously monitor meltwater infiltration and refreezing in snow and firn, applying Time Domain Reflectometry (TDR) measurements of dielectric permittivity as an indirect measure of snow/firn liquid water content. To my knowledge, this is the first application of TDR to studies of ice sheet hydrology. I developed and conducted field experiments on Haig Glacier in the Canadian Rocky Mountains and at DYE-2, Greenland, including in situ measurements of the evolution of subsurface temperature and liquid water content through a summer melt season. My studies aim to advance understanding of meltwater infiltration and refreezing processes in supraglacial snow and firn. In addition, my field data can help the modelling community to build more accurate models of firn hydrology in the percolation zone of glaciers and ice sheets, in support of glacier mass balance modelling. | en_US |
| dc.identifier.citation | Samimi, S. (2022). Meltwater Retention and Refreezing Processes in Glacier Snow and Firn (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.) | en_US |
| dc.identifier.doi | http://dx.doi.org/10.11575/PRISM/39512 | |
| dc.identifier.uri | http://hdl.handle.net/1880/114297 | |
| dc.language.iso | eng | en_US |
| dc.publisher.faculty | Arts | en_US |
| dc.publisher.institution | University of Calgary | en |
| dc.rights | University 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. | en_US |
| dc.subject | Glaciology | en_US |
| dc.subject | Ice Sheet Hydrology | en_US |
| dc.subject | Meltwater Retention | en_US |
| dc.subject | Climate Change | en_US |
| dc.subject | Hydrology | en_US |
| dc.subject.classification | Geography | en_US |
| dc.title | Meltwater Retention and Refreezing Processes in Glacier Snow and Firn | en_US |
| dc.type | doctoral thesis | en_US |
| thesis.degree.discipline | Geography | en_US |
| thesis.degree.grantor | University of Calgary | en_US |
| thesis.degree.name | Doctor of Philosophy (PhD) | en_US |
| ucalgary.item.requestcopy | true | en_US |