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| Titel |
Radio-frequency probes of Antarctic ice at South Pole |
| VerfasserIn |
D. Besson, I. Kravchenko |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 7, no. 3 ; Nr. 7, no. 3 (2013-05-16), S.855-866 |
| Datensatznummer |
250017970
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| Publikation (Nr.) |
 copernicus.org/tc-7-855-2013.pdf |
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| Zusammenfassung |
| Using hardware developed for the ARA (Askaryan Radio Array)
particle astrophysics experiment,
we herein report
on the amplitude and temporal characteristics of polarized surface radar
echo data collected in South Polar ice using
radio sounding equipment with 0.5-ns echo-time sampling.
We observe strong echoes at
6, 9.6, 13.9, 17, and 19 μs following
vertical pulse emission from the surface, corresponding to reflectors
in the upper half of the ice sheet. The synchronicity of those echoes
for all broadcast azimuthal polarizations affirms the lack of observable
birefringence over the upper half of the
ice sheet. Of the five strongest
echoes, three exhibit an evident amplitude
correlation with the local surface ice flow direction,
qualitatively consistent with measurements in East Antarctica.
Combined with other radio echo sounding data, we conclude that
observed birefringent asymmetries at South Pole are generated entirely
in the lower half of the ice sheet. By contrast, birefringent asymmetries
are observed at shallow depths in East Antarctica. |
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