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Short-term variations of Icelandic ice cap mass inferred from cGPS coordinate time series
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Compton_et_al-2017-Geochemistr ...
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FInal Published Version
Author
Compton, KathleenBennett, Richard A.
Hreinsdóttir, Sigrún
van Dam, Tonie
Bordoni, Andrea
Barletta, Valentina
Spada, Giorgio
Affiliation
Univ Arizona, Dept GeosciIssue Date
2017-06
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AMER GEOPHYSICAL UNIONCitation
Short-term variations of Icelandic ice cap mass inferred from cGPS coordinate time series 2017, 18 (6):2099 Geochemistry, Geophysics, GeosystemsRights
© 2017. American Geophysical Union. All Rights Reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
As the global climate changes, understanding short-term variations in water storage is increasingly important. Continuously operating Global Positioning System (cGPS) stations in Iceland record annual periodic motionthe elastic response to winter accumulation and spring melt seasonswith peak-to-peak vertical amplitudes over 20 mm for those sites in the Central Highlands. Here for the first time for Iceland, we demonstrate the utility of these cGPS-measured displacements for estimating seasonal and shorter-term ice cap mass changes. We calculate unit responses to each of the five largest ice caps in central Iceland at each of the 62 cGPS locations using an elastic half-space model and estimate ice mass variations from the cGPS time series using a simple least squares inversion scheme. We utilize all three components of motion, taking advantage of the seasonal motion recorded in the horizontal. We remove secular velocities and accelerations and explore the impact that seasonal motions due to atmospheric, hydrologic, and nontidal ocean loading have on our inversion results. Our results match available summer and winter mass balance measurements well, and we reproduce the seasonal stake-based observations of loading and melting within the 1 sigma confidence bounds of the inversion. We identify nonperiodic ice mass changes associated with interannual variability in precipitation and other processes such as increased melting due to reduced ice surface albedo or decreased melting due to ice cap insulation in response to tephra deposition following volcanic eruptions, processes that are not resolved with once or twice-yearly stake measurements.Note
6 Month Embargo; Published Online: 14 June 2017ISSN
15252027Version
Final published versionSponsors
NSF Graduate Research Fellowship [DGE-1143953]; P.E.O. Scholar Award; Arizona Geological Society Geoscience Scholarship; University of Arizona; NSF [EAR-0711446]; Icelandic Center for Research RANNIS [60243011]Additional Links
http://doi.wiley.com/10.1002/2017GC006831ae974a485f413a2113503eed53cd6c53
10.1002/2017GC006831