DOI: 10.5194/tc-7-855-2013
Scopus记录号: 2-s2.0-84883310087
论文题名: Radio-frequency probes of Antarctic ice at South Pole
作者: Besson D ; , Kravchenko I
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 3 起始页码: 855
结束页码: 866
语种: 英语
英文关键词: acoustic array
; amplitude
; astrophysics
; echo sounding
; hardware
; ice flow
; ice sheet
; synchrony
; Antarctica
; East Antarctica
英文摘要: 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. © Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74955
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: University of Kansas, Department of Physics and Astronomy, Lawrence, KS 66045-7582, United States; University of Nebraska - Lincoln, Department of Physics and Astronomy, Lincoln, NE 68588-0299, United States
Recommended Citation:
Besson D,, Kravchenko I. Radio-frequency probes of Antarctic ice at South Pole[J]. Cryosphere,2013-01-01,7(3)