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- G51C-0181: Exploring the anatomy of the GNSS seasonal signal in the arid western United States.
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Board 0181‚ Hall EFG (Poster Hall)NOLA CC
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Nina Miller, University of Nevada Reno (First Author, Presenting Author)
Corne Kreemer, University of Nevada, Reno
Earth’s crust subtly moves in response to changes in surface loading, and scientists use precise GPS stations to track those motions. To study any specific process responsible for the movement—like changing lake levels—we must first isolate the part of the GPS signal tied to that process. However, factors such as reference-frame definitions, air-pressure changes, heavy precipitation, and other local influences can obscure the signal of interest. In our study, we compare GPS-measured deformation at three major lakes in the arid western United States—Lake Mead, Great Salt Lake, and Mono Lake—with simple elastic predictions of how the ground should flex as seasonal lake levels rise and fall. Even after applying rigorous filters to remove broad seasonal “noise,” some stations show unexpected seasonal patterns. These surprises reveal missing elements in our models and data-processing workflows. By developing more robust methods to disentangle overlapping signals, we aim to help researchers use GPS data more reliably to monitor groundwater storage, lake loading, and other climate-driven movements of Earth’s crusts.
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