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Record #125851:

A reassessment of the in-situ dielectric constant of polar firn / Austin Kovacs, Anthony J. Gow, Rexford M. Morey.

Title: A reassessment of the in-situ dielectric constant of polar firn / Austin Kovacs, Anthony J. Gow, Rexford M. Morey.
Author(s): Kovacs, Austin.
Gow, Anthony J.
Morey, Rexford M.
Date: 1993.
In: CRREL Report. (1993.), Vol. 93-26 (1993)
Abstract: Success in using VHF and UHF frequency systems for sounding polar ice sheets has been tempered by uncertainty in in-situ dielectric constant ε', which controls effective velocity of electromagnetic wave propagating in air--ice mixture. Empirical equation for determining this constant vs density (specific gravity, ρ) was proposed by Robin and co-workers (1969), where ε'=(1+0.851 ρ)². However, this expression met with uncertainty because wide-angle radar refraction sounding techniques have produced values of ε' that are lower than Robin's equation predicts. This report discusses radar soundings made on McMurdo Ice Shelf, Antarctica, and compares resulting ε' values with Robin's equation, laboratory measurements on firn and ice, and other expressions given for determining ε' vs specific gravity of dry ice and firn. Findings indicate that form of Robin's equation is valid, but could be slightly improved to read ε'=(1+0.845 ρ)². Suggests why previous wide-angle radar sounding studies did not reproduce Robin's findings.
Notes:

CRREL Report. Vol. 93-26 :iii, 1-22 (1993).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.578.46 -- Snow cover and snow patches.
551.578.463 -- Snow cover, firnification.
537.226 -- Ice, dielectrical properties.
551.324.28 -- Ice shelves: McMurdo Ice Shelf.
551.321 -- Glaciological methods and instruments.
551.321.61 -- Ice sounding, geophysical methods.
53.087.23 -- Remote sensing.
621.396.96 -- Radar.
E3 -- Glaciology: instruments and methods.
(*7) -- Antarctic regions.
(*76) -- Ross Dependency.
SPRI record no.: 125851

MARCXML

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100 1# ‡aKovacs, Austin.
245 12 ‡aA reassessment of the in-situ dielectric constant of polar firn /‡cAustin Kovacs, Anthony J. Gow, Rexford M. Morey.
260 ## ‡a[S.l.] :‡b[s.n.],‡c1993.
300 ## ‡ap. iii, 1-22 :‡bill., diags., tables, map.
500 ## ‡aCRREL Report. Vol. 93-26 :iii, 1-22 (1993).
520 3# ‡aSuccess in using VHF and UHF frequency systems for sounding polar ice sheets has been tempered by uncertainty in in-situ dielectric constant ε', which controls effective velocity of electromagnetic wave propagating in air--ice mixture. Empirical equation for determining this constant vs density (specific gravity, ρ) was proposed by Robin and co-workers (1969), where ε'=(1+0.851 ρ)². However, this expression met with uncertainty because wide-angle radar refraction sounding techniques have produced values of ε' that are lower than Robin's equation predicts. This report discusses radar soundings made on McMurdo Ice Shelf, Antarctica, and compares resulting ε' values with Robin's equation, laboratory measurements on firn and ice, and other expressions given for determining ε' vs specific gravity of dry ice and firn. Findings indicate that form of Robin's equation is valid, but could be slightly improved to read ε'=(1+0.845 ρ)². Suggests why previous wide-angle radar sounding studies did not reproduce Robin's findings.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.578.46 -- Snow cover and snow patches.‡2udc
650 07 ‡a551.578.463 -- Snow cover, firnification.‡2udc
650 07 ‡a537.226 -- Ice, dielectrical properties.‡2udc
650 07 ‡a551.324.28 -- Ice shelves: McMurdo Ice Shelf.‡2udc
650 07 ‡a551.321 -- Glaciological methods and instruments.‡2udc
650 07 ‡a551.321.61 -- Ice sounding, geophysical methods.‡2udc
650 07 ‡a53.087.23 -- Remote sensing.‡2udc
650 07 ‡a621.396.96 -- Radar.‡2udc
650 07 ‡aE3 -- Glaciology: instruments and methods.‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
651 #7 ‡a(*76) -- Ross Dependency.‡2udc
700 1# ‡aGow, Anthony J.
700 1# ‡aMorey, Rexford M.
773 0# ‡7nnas ‡tCRREL Report. ‡gVol. 93-26 (1993) ‡wSPRI-54834
917 ## ‡aUnenhanced record from Muscat, imported 2019
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