Rise of Great Lakes surface water, sinking of the upper Midwest of the United States, and viscous collapse of the forebulge of the former Laurentide ice sheet ...
Great Lakes water levels rose 0.7–1.2 m from 2013 to 2019, increasing surface water volume by 285 km3. Solid Earth's elastic response to the increased mass load is nearly known: the Great Lakes floor fell 8–22 mm and the adjacent land fell 3–14 mm. Correcting GPS measurements for this predicted...
| Main Author: | |
|---|---|
| Format: | Dataset |
| Language: | unknown |
| Published: |
Root
2023
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.48577/jpl.dm6neg https://dataverse.jpl.nasa.gov/citation?persistentId=doi:10.48577/jpl.DM6NEG |
| Summary: | Great Lakes water levels rose 0.7–1.2 m from 2013 to 2019, increasing surface water volume by 285 km3. Solid Earth's elastic response to the increased mass load is nearly known: the Great Lakes floor fell 8–22 mm and the adjacent land fell 3–14 mm. Correcting GPS measurements for this predicted elastic loading (1) straightens position-time series, making the evolution of position more nearly a constant velocity and (2) reduces estimates of subsidence rate in Wisconsin, Michigan, and southern Ontario by 0.5–2 mm/yr, improving constraints on postglacial rebound. GPS records Wisconsin and Michigan to have subsided at 1–4 mm/yr. We find this sinking to be produced primarily by viscous collapse of the former Laurentide ice sheet forebulge and secondarily by elastic Great Lakes loading. We infer water on land in the Great Lakes watershed to be total water change observed by GRACE minus Great Lakes surface water smeared by a Gaussian distribution. Water stored on land each year reaches a maximum in March, six ... |
|---|