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| Titel |
Inversion for firn density-depth profile using phase-sensitive radar. |
| VerfasserIn |
Robert Arthern, Hugh Corr, Fabien Gillet-Chaulet, Robert Hawley |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055470
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| Zusammenfassung |
| Translating satellite measurements of ice sheet volume change into sea level contribution
requires knowledge of the profile of density as a function of depth within the ice sheet, and
how this profile changes over time. This paper describes an interferometric method of
inverting ground-penetrating radar returns for the profile of firn density as a function of
depth. The method is an interferometric implementation of the common-midpoint
approach, performed using a phase sensitive ground-penetrating radar. By recording the
phase difference of returns with a range of antenna separations, the different path
lengths through the firn allow a unique recovery of parameters that describe the
density profile. Our results suggest that the use of a phase sensitive radar can recover
differences in two-way travel time to an accuracy about twenty times greater than has
been reported for conventional processing of ground-penetrating radar returns.
In a test of the method performed at Summit station in Greenland, the recovered
density-depth profile agreed with ice core data to within 5% root-mean-square error. |
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