Quantifying Surface-Height Change Over a Periglacial Environment With ICESat-2 Laser Altimetry
| Autor: | M. R. Siegfried, M. B. Bryant, R. J. Michaelides, Adrian A. Borsa |
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| Rok vydání: | 2021 |
| Předmět: |
Informatics
Earthquake Source Observations Astronomy Permafrost Biogeosciences ICESat‐2 Remote Sensing InSAR Planetary Sciences: Solar System Objects Ionospheric Physics altimetry Interferometric synthetic aperture radar Permafrost Cryosphere and High‐latitude Processes Seismology Earthquake Interaction Forecasting and Prediction QE1-996.5 Exploration Geophysics Gravity Methods Ocean Predictability and Prediction The Ice Cloud and land Elevation Satellite‐2 (ICESat‐2) on‐orbit performance data discoveries and early science Geology Seasonally Frozen Ground Asteroids Seismic Cycle Related Deformations Tectonic Deformation Oceanography: General Policy Time Variable Gravity Climatology Comets: Dust Tails and Trails Estimation and Forecasting Seismicity and Tectonics Planetary Sciences: Comets and Small Bodies Space Weather Cryosphere Mathematical Geophysics Probabilistic Forecasting Research Article QB1-991 Satellite Geodesy: Results Environmental Science (miscellaneous) Radio Science Cryobiology Earthquake Dynamics Groundwater-related subsidence Comets Magnetospheric Physics Altimeter Geodesy and Gravity Ionosphere Monitoring Forecasting Prediction Gravity anomalies and Earth structure Continental Crust Elevation Policy Sciences Snow Active layer Interferometry General Earth and Planetary Sciences Satellite sense organs Other Subduction Zones Hydrology Transient Deformation Prediction Natural Hazards Forecasting |
| Zdroj: | Earth and Space Science (Hoboken, N.j.) Earth and Space Science, Vol 8, Iss 8, Pp n/a-n/a (2021) |
| ISSN: | 2333-5084 |
| Popis: | We use Ice, Cloud, and land Elevation Satellite 2 (ICESat‐2) laser altimetry crossovers and repeat tracks collected over the North Slope of Alaska to estimate ground surface‐height change due to the seasonal freezing and thawing of the active layer. We compare these measurements to a time series of surface deformation from Sentinel‐1 interferometric synthetic aperture radar (InSAR) and demonstrate agreement between these independent observations of surface deformation at broad spatial scales. We observe a relationship between ICESat‐2‐derived surface subsidence/uplift and changes in normalized accumulated degree days, which is consistent with the thermodynamically driven seasonal freezing and thawing of the active layer. Integrating ICESat‐2 crossover estimates of surface‐height change yields an annual time series of surface‐height change that is sensitive to changes in snow cover during spring and thawing of the active layer throughout spring and summer. Furthermore, this time series exhibits temporal correlation with independent reanalysis datasets of temperature and snow cover, as well as an InSAR‐derived time series. ICESat‐2‐derived surface‐height change estimates can be significantly affected by short length‐scale topographic gradients and changes in snow cover and snow depth. We discuss optimal strategies of post‐processing ICESat‐2 data for permafrost applications, as well as the future potential of joint ICESat‐2 and InSAR investigations of permafrost surface‐dynamics. Key Points ICESat‐2 altimetry can resolve surface subsidence that is related to changes in snow‐cover depth and seasonal thawing of the active layerICESat‐2 measurements of surface‐height change are affected by along‐track topographic gradients and complex surface roughnessComplementary ICESat‐2 and InSAR datasets can be jointly leveraged for future studies in periglacial environments |
| Databáze: | OpenAIRE |
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