Investigations of glacier terminus changes on weekly to decadal time scales. Black, T. E. ![Investigations of glacier terminus changes on weekly to decadal time scales [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex Glacier retreat and mass loss are contributing to global sea-level rise and environmental change. One method to improve our understanding of how glaciers affect local and global environments is to measure historical and ongoing glacier retreat. In this dissertation, I use satellite images to measure glacier terminus change in Greenland and Alaska. In both regions, I quantify glacier retreat and advance on time scales ranging from seasons to decades.In northwest and central-west Greenland, I investigate multi-decadal outlet glacier retreat and its potential driving mechanisms from 1972 through 2021. Over this time period, glaciers in this region of Greenland represented nearly half of Greenland’s total contribution to sea-level rise. I show that regional glacier retreat accelerated from 1996, and that this retreat is most sensitive to runoff and ocean temperatures. Because runoff and ocean temperatures can influence terminus positions through several mechanisms, it is likely that multiple mechanisms are contributing to the observed retreat in this region. I also examine multi-decadal glacier retreat, as well as seasonal terminus variations, for maritime glaciers in Kenai Fjords National Park, Alaska, from 1984 through 2021. I show that most glaciers retreated substantially, and those that did not were predominantly tidewater. Seasonally, tidewater, lake-terminating, and land-terminating glaciers all tended to retreat during the summer; in the winter, tidewater glaciers tended to advance, while lake-terminating glaciers continued to retreat, and land-terminating glaciers were more variable. Glacier change in Kenai Fjords National Park is driving changes in landcover and viewscapes, which affects local ecosystems and ecotourism. Finally, I characterize seasonal terminus variations around the full margin of Greenland at monthly and six-day temporal resolution. I show that nearly 75% of outlet glaciers exhibit terminus position seasonality, with seasonal retreat typically beginning in mid-May and continuing through early October. The onset and duration of the retreat period appears to be related to the timing of the onset of melt, while the magnitude of terminus position seasonality correlates with glacier velocity. Glacier dynamics are influenced by conditions at the terminus, and terminus position seasonality can affect projections of future ice-sheet mass balance.
@article{black_investigations_nodate,
title = {Investigations of glacier terminus changes on weekly to decadal time scales},
url = {https://digital.lib.washington.edu/researchworks/items/1b81758a-79f3-439c-9664-5c12c8adecbd},
abstract = {Glacier retreat and mass loss are contributing to global sea-level rise and environmental change. One method to improve our understanding of how glaciers affect local and global environments is to measure historical and ongoing glacier retreat. In this dissertation, I use satellite images to measure glacier terminus change in Greenland and Alaska. In both regions, I quantify glacier retreat and advance on time scales ranging from seasons to decades.In northwest and central-west Greenland, I investigate multi-decadal outlet glacier retreat and its potential driving mechanisms from 1972 through 2021. Over this time period, glaciers in this region of Greenland represented nearly half of Greenland’s total contribution to sea-level rise. I show that regional glacier retreat accelerated from 1996, and that this retreat is most sensitive to runoff and ocean temperatures. Because runoff and ocean temperatures can influence terminus positions through several mechanisms, it is likely that multiple mechanisms are contributing to the observed retreat in this region. I also examine multi-decadal glacier retreat, as well as seasonal terminus variations, for maritime glaciers in Kenai Fjords National Park, Alaska, from 1984 through 2021. I show that most glaciers retreated substantially, and those that did not were predominantly tidewater. Seasonally, tidewater, lake-terminating, and land-terminating glaciers all tended to retreat during the summer; in the winter, tidewater glaciers tended to advance, while lake-terminating glaciers continued to retreat, and land-terminating glaciers were more variable. Glacier change in Kenai Fjords National Park is driving changes in landcover and viewscapes, which affects local ecosystems and ecotourism. Finally, I characterize seasonal terminus variations around the full margin of Greenland at monthly and six-day temporal resolution. I show that nearly 75\% of outlet glaciers exhibit terminus position seasonality, with seasonal retreat typically beginning in mid-May and continuing through early October. The onset and duration of the retreat period appears to be related to the timing of the onset of melt, while the magnitude of terminus position seasonality correlates with glacier velocity. Glacier dynamics are influenced by conditions at the terminus, and terminus position seasonality can affect projections of future ice-sheet mass balance.},
language = {en},
urldate = {2024-09-26},
author = {Black, Taryn E.},
keywords = {/unread},
}
Downloads: 0
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Over this time period, glaciers in this region of Greenland represented nearly half of Greenland’s total contribution to sea-level rise. I show that regional glacier retreat accelerated from 1996, and that this retreat is most sensitive to runoff and ocean temperatures. Because runoff and ocean temperatures can influence terminus positions through several mechanisms, it is likely that multiple mechanisms are contributing to the observed retreat in this region. I also examine multi-decadal glacier retreat, as well as seasonal terminus variations, for maritime glaciers in Kenai Fjords National Park, Alaska, from 1984 through 2021. I show that most glaciers retreated substantially, and those that did not were predominantly tidewater. Seasonally, tidewater, lake-terminating, and land-terminating glaciers all tended to retreat during the summer; in the winter, tidewater glaciers tended to advance, while lake-terminating glaciers continued to retreat, and land-terminating glaciers were more variable. Glacier change in Kenai Fjords National Park is driving changes in landcover and viewscapes, which affects local ecosystems and ecotourism. Finally, I characterize seasonal terminus variations around the full margin of Greenland at monthly and six-day temporal resolution. I show that nearly 75% of outlet glaciers exhibit terminus position seasonality, with seasonal retreat typically beginning in mid-May and continuing through early October. The onset and duration of the retreat period appears to be related to the timing of the onset of melt, while the magnitude of terminus position seasonality correlates with glacier velocity. 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In both regions, I quantify glacier retreat and advance on time scales ranging from seasons to decades.In northwest and central-west Greenland, I investigate multi-decadal outlet glacier retreat and its potential driving mechanisms from 1972 through 2021. Over this time period, glaciers in this region of Greenland represented nearly half of Greenland’s total contribution to sea-level rise. I show that regional glacier retreat accelerated from 1996, and that this retreat is most sensitive to runoff and ocean temperatures. Because runoff and ocean temperatures can influence terminus positions through several mechanisms, it is likely that multiple mechanisms are contributing to the observed retreat in this region. I also examine multi-decadal glacier retreat, as well as seasonal terminus variations, for maritime glaciers in Kenai Fjords National Park, Alaska, from 1984 through 2021. I show that most glaciers retreated substantially, and those that did not were predominantly tidewater. Seasonally, tidewater, lake-terminating, and land-terminating glaciers all tended to retreat during the summer; in the winter, tidewater glaciers tended to advance, while lake-terminating glaciers continued to retreat, and land-terminating glaciers were more variable. Glacier change in Kenai Fjords National Park is driving changes in landcover and viewscapes, which affects local ecosystems and ecotourism. Finally, I characterize seasonal terminus variations around the full margin of Greenland at monthly and six-day temporal resolution. I show that nearly 75\\% of outlet glaciers exhibit terminus position seasonality, with seasonal retreat typically beginning in mid-May and continuing through early October. The onset and duration of the retreat period appears to be related to the timing of the onset of melt, while the magnitude of terminus position seasonality correlates with glacier velocity. 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