Great Lakes Calendar
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Great Lakes Seminar Series with Jeffrey Freymueller, Geodetic Observations of Water Mass Changes in the Great Lakes Basin
July 18, 2024
Changes in total water mass now can be measured by ground-based and space-based observations. As water moved around the planet, the entire Earth deforms as a result of the changing force exerted by the weight of the water, and we can measure these motions using precise GPS observations. The gravity changes due to the changing distribution of water can also be measured using data from the GRACE satellite mission. Because these observations provide estimates of the total water mass changes, we can combine them with measurements of surface water changes to infer changes in groundwater, which are otherwise hard to measure. Previous work showed that the 2012-2019 rise of Great Lakes water levels produced up to about 2 cm of ground subsidence, which we can observe in GPS data. To make accurate estimates of the water mass variations, we will need to fully understand (see more on the website).
Event website: https://ciglr.seas.umich.edu/event/071824-jeffrey-freymueller/
Contact: Margaret Throckmorton, University of Michigan, CIGLR
Email: [email protected]