Mapping bottomfast sea ice in Arctic lagoons using Sentinel-1 interferometery
Thesis (M.S.) University of Alaska Fairbanks, 2022 Sea ice is an important component of Arctic coastal ecosystems. Where the water is shallow enough, it can extend all the way to the seafloor and become bottomfast sea ice (BSI), the lateral extent of which depends upon ice thickness and the regional...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/13090 2023-05-15T14:48:44+02:00 Mapping bottomfast sea ice in Arctic lagoons using Sentinel-1 interferometery Pratt, Jacob W. Mahoney, Andy Iken, Katrin Kasper, Jeremy Romanovsky, Vladimir 2022-08 http://hdl.handle.net/11122/13090 en_US eng http://hdl.handle.net/11122/13090 Department of Geosciences Sea ice Arctic Coast Climatic changes Lagoons Synthetic aperture radar Arctic regions Ice cores Master of Science in Geophysics Thesis ms 2022 ftunivalaska 2023-02-23T21:38:02Z Thesis (M.S.) University of Alaska Fairbanks, 2022 Sea ice is an important component of Arctic coastal ecosystems. Where the water is shallow enough, it can extend all the way to the seafloor and become bottomfast sea ice (BSI), the lateral extent of which depends upon ice thickness and the regional nearshore slope. Sea ice thickness is a well-known indicator of climate change in the Arctic and in areas with gently sloping seafloors, we expect the extent of BSI to be a sensitive indicator of changes in ice thickness. Contact with the seafloor can help cool and aggregate subsea permafrost and restrict under-ice habitats. It also prevents or reduces motion experienced by floating landfast ice in response to wind, ocean, and ice forcing. Bottomfast ice is in turn more stable than floating ice with implications for human activities on ice. BSI cannot easily be distinguished from floating landfast ice using optical imagery and synthetic aperture radar (SAR) is not typically able to penetrate to the bottom of saline ice. As a result, large-scale mapping of BSI has previously been limited to brackish waters near Arctic deltas, where (SAR) can detect the ice-water interface. However, recent work has demonstrated that SAR interferometry (InSAR) can be used to delineate BSI based on an absence of small-scale surface motion over time. Here, we utilize the Alaska Satellite Facility's Hybrid Pluggable Processing Pipeline (HyP3): A cloud-based infrastructure to process interferograms from the entire Sentinel-1 record over three lagoon systems across the Beaufort Sea coast of Alaska near Utqiagvik, Prudhoe Bay, and Kaktovik. We develop and test a mapping approach that discriminates bottomfast ice based on a near-zero gradient in interferometric phase change, which on floating lagoon ice is primarily caused by surface motion from tides and thermal stress. This enables the comparison of the date of onset, maximum extent, and seasonal evolution of BSI between the lagoons from 2016-2020. We also evaluate the use of ... Thesis Arctic Beaufort Sea Climate change Ice permafrost Prudhoe Bay Sea ice Alaska University of Alaska: ScholarWorks@UA Arctic Fairbanks |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Sea ice Arctic Coast Climatic changes Lagoons Synthetic aperture radar Arctic regions Ice cores Master of Science in Geophysics |
spellingShingle |
Sea ice Arctic Coast Climatic changes Lagoons Synthetic aperture radar Arctic regions Ice cores Master of Science in Geophysics Pratt, Jacob W. Mapping bottomfast sea ice in Arctic lagoons using Sentinel-1 interferometery |
topic_facet |
Sea ice Arctic Coast Climatic changes Lagoons Synthetic aperture radar Arctic regions Ice cores Master of Science in Geophysics |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2022 Sea ice is an important component of Arctic coastal ecosystems. Where the water is shallow enough, it can extend all the way to the seafloor and become bottomfast sea ice (BSI), the lateral extent of which depends upon ice thickness and the regional nearshore slope. Sea ice thickness is a well-known indicator of climate change in the Arctic and in areas with gently sloping seafloors, we expect the extent of BSI to be a sensitive indicator of changes in ice thickness. Contact with the seafloor can help cool and aggregate subsea permafrost and restrict under-ice habitats. It also prevents or reduces motion experienced by floating landfast ice in response to wind, ocean, and ice forcing. Bottomfast ice is in turn more stable than floating ice with implications for human activities on ice. BSI cannot easily be distinguished from floating landfast ice using optical imagery and synthetic aperture radar (SAR) is not typically able to penetrate to the bottom of saline ice. As a result, large-scale mapping of BSI has previously been limited to brackish waters near Arctic deltas, where (SAR) can detect the ice-water interface. However, recent work has demonstrated that SAR interferometry (InSAR) can be used to delineate BSI based on an absence of small-scale surface motion over time. Here, we utilize the Alaska Satellite Facility's Hybrid Pluggable Processing Pipeline (HyP3): A cloud-based infrastructure to process interferograms from the entire Sentinel-1 record over three lagoon systems across the Beaufort Sea coast of Alaska near Utqiagvik, Prudhoe Bay, and Kaktovik. We develop and test a mapping approach that discriminates bottomfast ice based on a near-zero gradient in interferometric phase change, which on floating lagoon ice is primarily caused by surface motion from tides and thermal stress. This enables the comparison of the date of onset, maximum extent, and seasonal evolution of BSI between the lagoons from 2016-2020. We also evaluate the use of ... |
author2 |
Mahoney, Andy Iken, Katrin Kasper, Jeremy Romanovsky, Vladimir |
format |
Thesis |
author |
Pratt, Jacob W. |
author_facet |
Pratt, Jacob W. |
author_sort |
Pratt, Jacob W. |
title |
Mapping bottomfast sea ice in Arctic lagoons using Sentinel-1 interferometery |
title_short |
Mapping bottomfast sea ice in Arctic lagoons using Sentinel-1 interferometery |
title_full |
Mapping bottomfast sea ice in Arctic lagoons using Sentinel-1 interferometery |
title_fullStr |
Mapping bottomfast sea ice in Arctic lagoons using Sentinel-1 interferometery |
title_full_unstemmed |
Mapping bottomfast sea ice in Arctic lagoons using Sentinel-1 interferometery |
title_sort |
mapping bottomfast sea ice in arctic lagoons using sentinel-1 interferometery |
publishDate |
2022 |
url |
http://hdl.handle.net/11122/13090 |
geographic |
Arctic Fairbanks |
geographic_facet |
Arctic Fairbanks |
genre |
Arctic Beaufort Sea Climate change Ice permafrost Prudhoe Bay Sea ice Alaska |
genre_facet |
Arctic Beaufort Sea Climate change Ice permafrost Prudhoe Bay Sea ice Alaska |
op_relation |
http://hdl.handle.net/11122/13090 Department of Geosciences |
_version_ |
1766319818656448512 |