The Influence of Bubbles on the Seasonal SAR Backscatter Response of Perennially Ice-Covered Lakes, Antarctica
Antarctica is home to numerous perennially ice-covered (PIC) lakes that host rich benthic microbial ecosystems. These lakes are covered by a thick floating ice cover year-round and often have water columns supersaturated in dissolved gases, resulting in heavily bubbled ice covers, altering the optic...
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Université d'Ottawa / University of Ottawa
2023
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Online Access: | http://hdl.handle.net/10393/45641 https://doi.org/10.20381/ruor-29845 |
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ftunivottawa:oai:ruor.uottawa.ca:10393/45641 2023-12-24T10:11:33+01:00 The Influence of Bubbles on the Seasonal SAR Backscatter Response of Perennially Ice-Covered Lakes, Antarctica Gaudreau, Adam Lacelle, Denis 2023-11-20 application/pdf http://hdl.handle.net/10393/45641 https://doi.org/10.20381/ruor-29845 en eng Université d'Ottawa / University of Ottawa http://hdl.handle.net/10393/45641 http://dx.doi.org/10.20381/ruor-29845 Synthetic aperture radar (SAR) Antarctica perennially ice-cover lake bubbles dissolved gas Thesis 2023 ftunivottawa https://doi.org/10.20381/ruor-29845 2023-11-26T00:00:14Z Antarctica is home to numerous perennially ice-covered (PIC) lakes that host rich benthic microbial ecosystems. These lakes are covered by a thick floating ice cover year-round and often have water columns supersaturated in dissolved gases, resulting in heavily bubbled ice covers, altering the optical properties of the ice and the amount of light that penetrates into the water column. Thus, understanding the optical properties of perennial lake ice can have important scientific implications to the study of life on Earth and the search for extraterrestrial life. Synthetic aperture radar (SAR) remote sensing has been used rigorously for over 50 years to study and monitor the seasonal response and long-term trends of backscatter over seasonally ice-covered (SIC) Arctic lakes. Limited studies have assessed the impacts of dissolved gases and ice/water interface bubbles on SAR backscatter variability over SIC lakes. The seasonal backscatter response of Antarctic PIC lakes remains unexplored; their physical nature asserts that their backscatter response should largely be decoupled from seasonal factors according to SIC lake backscatter theory. Additionally, gas supersaturated PIC lakes are ideal candidates to better understand the role of gas buildup and bubble formation on the backscatter response from floating ice covers. This thesis leverages a dense stack of Sentinel-1 C-band SAR imagery over Lake Untersee, a well-sealed PIC lake in East Antarctica, to explore the relationships between SAR backscatter and ice/water interface bubbles. This analysis integrates field measurements and temporal observations at the ice/water interface. Lastly, a brief comparative analysis extends to other ice covers, including moat-forming PIC lakes, as well as first-year and multi-year Arctic sea and lake ice. It is shown that Lake Untersee has a seasonal backscatter regime that is linked to air temperature. A strong correlation is found between the timing of backscatter intensity increase in winter and ice thickness. This relationship ... Thesis Antarc* Antarctic Antarctica Arctic East Antarctica uO Research (University of Ottawa - uOttawa) Antarctic Arctic East Antarctica Untersee ENVELOPE(13.467,13.467,-71.350,-71.350) |
institution |
Open Polar |
collection |
uO Research (University of Ottawa - uOttawa) |
op_collection_id |
ftunivottawa |
language |
English |
topic |
Synthetic aperture radar (SAR) Antarctica perennially ice-cover lake bubbles dissolved gas |
spellingShingle |
Synthetic aperture radar (SAR) Antarctica perennially ice-cover lake bubbles dissolved gas Gaudreau, Adam The Influence of Bubbles on the Seasonal SAR Backscatter Response of Perennially Ice-Covered Lakes, Antarctica |
topic_facet |
Synthetic aperture radar (SAR) Antarctica perennially ice-cover lake bubbles dissolved gas |
description |
Antarctica is home to numerous perennially ice-covered (PIC) lakes that host rich benthic microbial ecosystems. These lakes are covered by a thick floating ice cover year-round and often have water columns supersaturated in dissolved gases, resulting in heavily bubbled ice covers, altering the optical properties of the ice and the amount of light that penetrates into the water column. Thus, understanding the optical properties of perennial lake ice can have important scientific implications to the study of life on Earth and the search for extraterrestrial life. Synthetic aperture radar (SAR) remote sensing has been used rigorously for over 50 years to study and monitor the seasonal response and long-term trends of backscatter over seasonally ice-covered (SIC) Arctic lakes. Limited studies have assessed the impacts of dissolved gases and ice/water interface bubbles on SAR backscatter variability over SIC lakes. The seasonal backscatter response of Antarctic PIC lakes remains unexplored; their physical nature asserts that their backscatter response should largely be decoupled from seasonal factors according to SIC lake backscatter theory. Additionally, gas supersaturated PIC lakes are ideal candidates to better understand the role of gas buildup and bubble formation on the backscatter response from floating ice covers. This thesis leverages a dense stack of Sentinel-1 C-band SAR imagery over Lake Untersee, a well-sealed PIC lake in East Antarctica, to explore the relationships between SAR backscatter and ice/water interface bubbles. This analysis integrates field measurements and temporal observations at the ice/water interface. Lastly, a brief comparative analysis extends to other ice covers, including moat-forming PIC lakes, as well as first-year and multi-year Arctic sea and lake ice. It is shown that Lake Untersee has a seasonal backscatter regime that is linked to air temperature. A strong correlation is found between the timing of backscatter intensity increase in winter and ice thickness. This relationship ... |
author2 |
Lacelle, Denis |
format |
Thesis |
author |
Gaudreau, Adam |
author_facet |
Gaudreau, Adam |
author_sort |
Gaudreau, Adam |
title |
The Influence of Bubbles on the Seasonal SAR Backscatter Response of Perennially Ice-Covered Lakes, Antarctica |
title_short |
The Influence of Bubbles on the Seasonal SAR Backscatter Response of Perennially Ice-Covered Lakes, Antarctica |
title_full |
The Influence of Bubbles on the Seasonal SAR Backscatter Response of Perennially Ice-Covered Lakes, Antarctica |
title_fullStr |
The Influence of Bubbles on the Seasonal SAR Backscatter Response of Perennially Ice-Covered Lakes, Antarctica |
title_full_unstemmed |
The Influence of Bubbles on the Seasonal SAR Backscatter Response of Perennially Ice-Covered Lakes, Antarctica |
title_sort |
influence of bubbles on the seasonal sar backscatter response of perennially ice-covered lakes, antarctica |
publisher |
Université d'Ottawa / University of Ottawa |
publishDate |
2023 |
url |
http://hdl.handle.net/10393/45641 https://doi.org/10.20381/ruor-29845 |
long_lat |
ENVELOPE(13.467,13.467,-71.350,-71.350) |
geographic |
Antarctic Arctic East Antarctica Untersee |
geographic_facet |
Antarctic Arctic East Antarctica Untersee |
genre |
Antarc* Antarctic Antarctica Arctic East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Arctic East Antarctica |
op_relation |
http://hdl.handle.net/10393/45641 http://dx.doi.org/10.20381/ruor-29845 |
op_doi |
https://doi.org/10.20381/ruor-29845 |
_version_ |
1786166916159635456 |