Satellite and airborne observations of ocean-driven mass-balance processes on Ross Ice Shelf, Antarctica
Increasing mass loss from the Antarctic Ice Sheet has contributed to recent acceleration in the rate of global mean sea-level rise (SLR). Its full SLR potential is ~58 m, and its future contribution remains highly uncertain. The flow of Antarctica’s grounded ice into the ocean, and thus its contribu...
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ftcdlib:oai:escholarship.org:ark:/13030/qt3zd9x4tv 2023-11-12T04:06:38+01:00 Satellite and airborne observations of ocean-driven mass-balance processes on Ross Ice Shelf, Antarctica Becker, Maya Karina Fricker, Helen A 2023-01-01 https://escholarship.org/uc/item/3zd9x4tv en eng eScholarship, University of California qt3zd9x4tv https://escholarship.org/uc/item/3zd9x4tv public Geophysics Remote sensing Physical oceanography Antarctica Ice shelves Iceberg calving Sea-level rise etd 2023 ftcdlib 2023-10-16T18:04:36Z Increasing mass loss from the Antarctic Ice Sheet has contributed to recent acceleration in the rate of global mean sea-level rise (SLR). Its full SLR potential is ~58 m, and its future contribution remains highly uncertain. The flow of Antarctica’s grounded ice into the ocean, and thus its contribution to SLR, is regulated by buttressing from floating ice shelves. Ice-shelf mass loss can reduce this buttressing effect. In this dissertation, I used satellite and airborne remote sensing data to explore three processes by which the ocean drives mass change on Antarctica’s large Ross Ice Shelf (RIS).First, I compared RIS thicknesses estimated from satellite laser altimetry and ROSETTA-Ice airborne radar data to identify a potential area of basal marine-ice accretion (i.e., local mass gain) in the ice-shelf interior. Large uncertainties prevent a definitive conclusion; reducing uncertainties will require additional measurements of ice-column density and firn properties. Second, I showed that airborne radar thickness profiles capture near-front thinning of RIS associated with basal melting by seasonally warmed upper-ocean water.Finally, I investigated the bending of the RIS front due to buoyancy created by the melting-related development of a submerged bench of ice, a mechanism that may lead to mass loss by calving of small icebergs. Profiles of the ice-shelf surface height from two satellite laser altimetry missions (ICESat, 2003–2009; and ICESat-2, 2018–present) reveal that this bending is larger on the eastern section of the RIS front, reflecting along-front variability in near-front ice thickness and ocean conditions. I also found that the surface deformation increased overall between 2018 and 2022. Between the two satellite mission periods, these surface structures grew along sections of the RIS front that experienced large calving events in the early 2000s.Taken together, these studies demonstrate that important mass-balance processes at the interface of ice shelf and ocean occur at small spatial scales that ... Thesis Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf University of California: eScholarship Antarctic The Antarctic Ross Ice Shelf |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Geophysics Remote sensing Physical oceanography Antarctica Ice shelves Iceberg calving Sea-level rise |
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Geophysics Remote sensing Physical oceanography Antarctica Ice shelves Iceberg calving Sea-level rise Becker, Maya Karina Satellite and airborne observations of ocean-driven mass-balance processes on Ross Ice Shelf, Antarctica |
topic_facet |
Geophysics Remote sensing Physical oceanography Antarctica Ice shelves Iceberg calving Sea-level rise |
description |
Increasing mass loss from the Antarctic Ice Sheet has contributed to recent acceleration in the rate of global mean sea-level rise (SLR). Its full SLR potential is ~58 m, and its future contribution remains highly uncertain. The flow of Antarctica’s grounded ice into the ocean, and thus its contribution to SLR, is regulated by buttressing from floating ice shelves. Ice-shelf mass loss can reduce this buttressing effect. In this dissertation, I used satellite and airborne remote sensing data to explore three processes by which the ocean drives mass change on Antarctica’s large Ross Ice Shelf (RIS).First, I compared RIS thicknesses estimated from satellite laser altimetry and ROSETTA-Ice airborne radar data to identify a potential area of basal marine-ice accretion (i.e., local mass gain) in the ice-shelf interior. Large uncertainties prevent a definitive conclusion; reducing uncertainties will require additional measurements of ice-column density and firn properties. Second, I showed that airborne radar thickness profiles capture near-front thinning of RIS associated with basal melting by seasonally warmed upper-ocean water.Finally, I investigated the bending of the RIS front due to buoyancy created by the melting-related development of a submerged bench of ice, a mechanism that may lead to mass loss by calving of small icebergs. Profiles of the ice-shelf surface height from two satellite laser altimetry missions (ICESat, 2003–2009; and ICESat-2, 2018–present) reveal that this bending is larger on the eastern section of the RIS front, reflecting along-front variability in near-front ice thickness and ocean conditions. I also found that the surface deformation increased overall between 2018 and 2022. Between the two satellite mission periods, these surface structures grew along sections of the RIS front that experienced large calving events in the early 2000s.Taken together, these studies demonstrate that important mass-balance processes at the interface of ice shelf and ocean occur at small spatial scales that ... |
author2 |
Fricker, Helen A |
format |
Thesis |
author |
Becker, Maya Karina |
author_facet |
Becker, Maya Karina |
author_sort |
Becker, Maya Karina |
title |
Satellite and airborne observations of ocean-driven mass-balance processes on Ross Ice Shelf, Antarctica |
title_short |
Satellite and airborne observations of ocean-driven mass-balance processes on Ross Ice Shelf, Antarctica |
title_full |
Satellite and airborne observations of ocean-driven mass-balance processes on Ross Ice Shelf, Antarctica |
title_fullStr |
Satellite and airborne observations of ocean-driven mass-balance processes on Ross Ice Shelf, Antarctica |
title_full_unstemmed |
Satellite and airborne observations of ocean-driven mass-balance processes on Ross Ice Shelf, Antarctica |
title_sort |
satellite and airborne observations of ocean-driven mass-balance processes on ross ice shelf, antarctica |
publisher |
eScholarship, University of California |
publishDate |
2023 |
url |
https://escholarship.org/uc/item/3zd9x4tv |
geographic |
Antarctic The Antarctic Ross Ice Shelf |
geographic_facet |
Antarctic The Antarctic Ross Ice Shelf |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf |
op_relation |
qt3zd9x4tv https://escholarship.org/uc/item/3zd9x4tv |
op_rights |
public |
_version_ |
1782327691944394752 |