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<td style="text-align: left; width: 558.209px; box-sizing: border-box;"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><img alt="Dissertation Defense Announcement at the Cullen College of Engineering" id="image_0" width="600" height="171" style="width: 600px; height: 171px;" src="https://www.egr.uh.edu/sites/www.egr.uh.edu/files/enews/2024/images/dissertation.png"></span>
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Name Dynamics of Antarctic Glaciers Using Differential Interferometric Synthetic Radar Remote
<span style="color: rgb(200, 38, 19);">Sensing </span>Observations and Ice-Sheet Models</h1>
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Natalya Ross</h2>
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<span style="font-family: Arial, sans-serif; font-size: 10.5pt; color: rgb(0, 0, 0);">June 24</span><span style="font-family: Arial, sans-serif; font-size: 7pt; color: black;">th</span><span style="font-family: Arial, sans-serif; font-size: 10.5pt; color: rgb(0, 0, 0);">,
2025, 1:00 to 3:00 p.m. (CST)</span></p>
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<span style="font-family: Arial, sans-serif; font-size: 10.5pt; color: rgb(0, 0, 0);">Location: UH Technology Bridge Building 4, 2</span><span style="font-family: Arial, sans-serif; font-size: 7pt; color: black;">nd</span><span style="font-family: Arial, sans-serif; font-size: 10.5pt; color: rgb(0, 0, 0);"> floor,
NCALM Conference Room Virtual link: </span><span style="font-family: Arial, sans-serif; font-size: 10.5pt; color: rgb(5, 99, 193);"><u>Natalya Ross’ Dissertation Defense</u></span></p>
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Committee Chair:</h4>
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<span style="font-family: Arial, sans-serif; font-size: 10.5pt; color: rgb(0, 0, 0);">Dr. Pietro Milillo, Ph.D.</span></p>
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Committee Members:</h4>
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<span style="font-family: Arial, sans-serif; font-size: 10.5pt; color: rgb(0, 0, 0);">Dr. Craig L. Glennie, Ph.D. | Dr. Hyongki Lee, Ph.D. | Dr. Julia S. Wellner, Ph.D. | Dr. Shuhab D. Khan, Ph.D.</span></p>
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<b>Abstract</b></div>
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Grounding lines, which mark the boundary where a glacier transitions from resting on bedrock to floating in the ocean, are key indicators of glacier stability and ice sheet dynamics. In Antarctica, which holds approximately 58 m of sea level equivalent, grounding
lines are crucial for investigating processes governing glacier behavior and evaluating climate change impacts. While long-term glacier retreat has been studied over decades, grounding lines also experience tide-driven short-term movements, which are less
studied due to limited data and an incomplete understanding of the physics of the process. To address this gap, improved datasets with high temporal and spatial resolution, along with better observation-based modeling, are needed to refine predictions of Antarctic
ice loss and its impact on global sea level rise.</div>
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This dissertation advances grounding line research by utilizing a unique COSMO-SkyMed Differential Interferometric Synthetic Aperture Radar (DInSAR) dataset, enabling precise mapping even in areas not accessible with other techniques. This dataset facilitates
continuous monitoring of grounding line changes over nearly two years (2020 – 2022) and allows for the extrapolation of long-term retreat rates spanning more than 25 years. Given that manual delineation is labor-intensive, this work explores two automated
approaches for grounding line mapping: a deep learning-based method and a phase-gradient-based method. These approaches are compared in terms of accuracy, limitations, and applicability, offering guidance on choosing the most suitable method for different
research needs, streamlining the mapping process. To explore short-term grounding line dynamics, this dissertation uses viscous and viscoelastic modeling frameworks to simulate tide-driven movements, comparing model predictions with DInSAR-derived measurements.
Additionally, based on DInSAR-derived grounding line records, this dissertation analyzes the relationship between short-term grounding line movements and key glacier parameters, and links these findings to long-term glacier retreat rates.</div>
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This dissertation offers new insights into primary physical mechanisms behind glacier movement, helping the cryosphere community refine future models. Its outcomes contribute to enhanced monitoring of grounding lines, provide automation tools to reduce mapping
time, and improve understanding of physical processes governing short-term glacier behavior.</div>
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