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Short-Timescale Dynamics of Marine-T...

Kane, Emily.

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Short-Timescale Dynamics of Marine-Terminating Glaciers in Western Greenland.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Short-Timescale Dynamics of Marine-Terminating Glaciers in Western Greenland./
Author:	Kane, Emily.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	82 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-06, Section: B.
Contained By:	Dissertations Abstracts International82-06B.
Subject:	Environmental science. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27995207
ISBN:	9798557012836

Short-Timescale Dynamics of Marine-Terminating Glaciers in Western Greenland.
Kane, Emily.

Short-Timescale Dynamics of Marine-Terminating Glaciers in Western Greenland. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 82 p.

Source: Dissertations Abstracts International, Volume: 82-06, Section: B.

Thesis (Ph.D.)--University of California, Irvine, 2020.

This item must not be sold to any third party vendors.

Iceberg calving is a major component of glacier mass ablation that is not well understood due to a lack of detailed temporal and spatial observations. For better understanding, it is critical to examine processes occurring on the time scale of calving processes, sub-daily to sub-hourly. Current satellites are not able to observe the same location at time scales small enough to measure sub-daily phenomena. This research aims to increase the temporal resolution of ice speed and elevation measurements during the calving season to allow for analysis of short-term variations that are otherwise unobserved. We measure glacier speed and surface elevation at 3-minute intervals using a portable radar interferometer at three marine-terminating glaciers in West Greenland over two summer field campaigns. We detect diurnal variations in glacier speed caused by tidal height changes that propagate far inland, the effect of which varies by glacier but are consistent with simple models where basal stress is tidally modulated. We find no speed up from ice shedding off the calving face or the detachment of floating ice blocks, as expected. We detect a 30% speedup within a few hundred meters of the ice front that persists for days when calving removes full thickness grounded ice blocks. Within one ice thickness from the calving front, we detect strain rates 2 to 3 times larger than observable from satellite data, which has implications for studying iceberg calving as a fracturing process, in particular to select an appropriate value of the threshold tensile stress necessary for ice cliff failure.

ISBN: 9798557012836Subjects--Topical Terms:

677245
Environmental science.
Subjects--Index Terms:

Calving

Short-Timescale Dynamics of Marine-Terminating Glaciers in Western Greenland.
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245 1 0 $a Short-Timescale Dynamics of Marine-Terminating Glaciers in Western Greenland.
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300 $a 82 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-06, Section: B.
500 $a Advisor: Rignot, Eric.
502 $a Thesis (Ph.D.)--University of California, Irvine, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a Iceberg calving is a major component of glacier mass ablation that is not well understood due to a lack of detailed temporal and spatial observations. For better understanding, it is critical to examine processes occurring on the time scale of calving processes, sub-daily to sub-hourly. Current satellites are not able to observe the same location at time scales small enough to measure sub-daily phenomena. This research aims to increase the temporal resolution of ice speed and elevation measurements during the calving season to allow for analysis of short-term variations that are otherwise unobserved. We measure glacier speed and surface elevation at 3-minute intervals using a portable radar interferometer at three marine-terminating glaciers in West Greenland over two summer field campaigns. We detect diurnal variations in glacier speed caused by tidal height changes that propagate far inland, the effect of which varies by glacier but are consistent with simple models where basal stress is tidally modulated. We find no speed up from ice shedding off the calving face or the detachment of floating ice blocks, as expected. We detect a 30% speedup within a few hundred meters of the ice front that persists for days when calving removes full thickness grounded ice blocks. Within one ice thickness from the calving front, we detect strain rates 2 to 3 times larger than observable from satellite data, which has implications for studying iceberg calving as a fracturing process, in particular to select an appropriate value of the threshold tensile stress necessary for ice cliff failure.
590 $a School code: 0030.
650 4 $a Environmental science. $3 677245
650 4 $a Remote sensing. $3 535394
650 4 $a Geophysics. $3 535228
650 4 $a European studies. $3 3168420
650 4 $a Marine geology. $3 3173821
650 4 $a Information technology. $3 532993
650 4 $a Climate change. $2 bicssc $3 2079509
653 $a Calving
653 $a Glaciology
653 $a Greenland
653 $a InSAR
653 $a Marine-terminating glaciers
653 $a Terrestrial Radar
653 $a Iceberg calving
653 $a Basal stress
653 $a Ice blocks
653 $a Ice thickness
653 $a Fracturing process
653 $a Ice cliff failure
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690 $a 0799
690 $a 0373
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710 2 $a University of California, Irvine. $b Earth System Science - Ph.D.. $3 2100202
773 0 $t Dissertations Abstracts International $g 82-06B.
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792 $a 2020
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27995207