Melting temperature changes during slip across subglacial cavities drive basal mass exchange
The importance of glacier sliding has motivated a rich literature describing the thermomechanical interactions between ice, liquid water and bed materials. Early recognition of the gradient in melting temperature across small bed obstacles led to focused studies of regelation. An appreciation for th...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2022-02-01
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| Series: | Journal of Glaciology |
| Subjects: | |
| Online Access: | https://www.cambridge.org/core/product/identifier/S0022143021001076/type/journal_article |
| _version_ | 1811155718333530112 |
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| author | Alan W. Rempel Colin R. Meyer Kiya L. Riverman |
| author_facet | Alan W. Rempel Colin R. Meyer Kiya L. Riverman |
| author_sort | Alan W. Rempel |
| collection | DOAJ |
| description | The importance of glacier sliding has motivated a rich literature describing the thermomechanical interactions between ice, liquid water and bed materials. Early recognition of the gradient in melting temperature across small bed obstacles led to focused studies of regelation. An appreciation for the limits on ice deformation rates downstream of larger obstacles highlighted a role for cavitation, which has subsequently gained prominence in descriptions of subglacial drainage. Here, we show that the changes in melting temperature that accompany changes in normal stress along a sliding ice interface near cavities and other macroscopic drainage elements cause appreciable supercooling and basal mass exchange. This provides the basis of a novel formation mechanism for widely observed laminated debris-rich basal ice layers. |
| first_indexed | 2024-04-10T04:39:16Z |
| format | Article |
| id | doaj.art-0c58b305d42142138edf1402c97d8821 |
| institution | Directory Open Access Journal |
| issn | 0022-1430 1727-5652 |
| language | English |
| last_indexed | 2024-04-10T04:39:16Z |
| publishDate | 2022-02-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Journal of Glaciology |
| spelling | doaj.art-0c58b305d42142138edf1402c97d88212023-03-09T12:41:13ZengCambridge University PressJournal of Glaciology0022-14301727-56522022-02-016819720310.1017/jog.2021.107Melting temperature changes during slip across subglacial cavities drive basal mass exchangeAlan W. Rempel0Colin R. Meyer1https://orcid.org/0000-0002-1209-1881Kiya L. Riverman2https://orcid.org/0000-0002-8033-3096Department of Earth Sciences, University of Oregon, Eugene OR, USAThayer School of Engineering, Dartmouth College, Hanover NH, USACollege of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis OR, USAThe importance of glacier sliding has motivated a rich literature describing the thermomechanical interactions between ice, liquid water and bed materials. Early recognition of the gradient in melting temperature across small bed obstacles led to focused studies of regelation. An appreciation for the limits on ice deformation rates downstream of larger obstacles highlighted a role for cavitation, which has subsequently gained prominence in descriptions of subglacial drainage. Here, we show that the changes in melting temperature that accompany changes in normal stress along a sliding ice interface near cavities and other macroscopic drainage elements cause appreciable supercooling and basal mass exchange. This provides the basis of a novel formation mechanism for widely observed laminated debris-rich basal ice layers.https://www.cambridge.org/core/product/identifier/S0022143021001076/type/journal_articleBasal iceice physicsmelt-basalsubglacial processes |
| spellingShingle | Alan W. Rempel Colin R. Meyer Kiya L. Riverman Melting temperature changes during slip across subglacial cavities drive basal mass exchange Journal of Glaciology Basal ice ice physics melt-basal subglacial processes |
| title | Melting temperature changes during slip across subglacial cavities drive basal mass exchange |
| title_full | Melting temperature changes during slip across subglacial cavities drive basal mass exchange |
| title_fullStr | Melting temperature changes during slip across subglacial cavities drive basal mass exchange |
| title_full_unstemmed | Melting temperature changes during slip across subglacial cavities drive basal mass exchange |
| title_short | Melting temperature changes during slip across subglacial cavities drive basal mass exchange |
| title_sort | melting temperature changes during slip across subglacial cavities drive basal mass exchange |
| topic | Basal ice ice physics melt-basal subglacial processes |
| url | https://www.cambridge.org/core/product/identifier/S0022143021001076/type/journal_article |
| work_keys_str_mv | AT alanwrempel meltingtemperaturechangesduringslipacrosssubglacialcavitiesdrivebasalmassexchange AT colinrmeyer meltingtemperaturechangesduringslipacrosssubglacialcavitiesdrivebasalmassexchange AT kiyalriverman meltingtemperaturechangesduringslipacrosssubglacialcavitiesdrivebasalmassexchange |