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Dielectric permittivity of snow measured along the route traversed in the Japanese-Swedish Antarctic Expedition 2007/08
Vise andre og tillknytning
Ansvarlig organisasjon
2010 (engelsk)Inngår i: Annals of Glaciology, ISSN 0260-3055, E-ISSN 1727-5644, Vol. 51Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

As a joint contribution of Japan and Sweden to the International Polar Year 2007-09, a field expedition between Syowa and Wasa stations in East Antarctica was carried out in the 2007/08 austral summer season. Along the 2800 km long expedition route, the dielectric permittivity of the upper 1 m snow layer was measured at intervals of approximately 50 km using a snow fork, a parallel-wire transmission-line resonator. More than 2000 measurements were performed under carefully calibrated conditions, mostly in the interior of Antarctica. The permittivity epsilon' was a function of snow density as in previous studies on dry snow, but the values were significantly smaller than those reported before. In the light of the dielectric mixture theory, the relatively smaller e' obtained in this study can be attributed to the snow structures characteristic in the studied region. Our data suggest that the permittivity of snow in the Antarctic interior is significantly affected by weak bonding between snow grains, which is due to depth-hoar formation in the extremely low-temperature conditions.

sted, utgiver, år, opplag, sider
2010. Vol. 51
Emneord [en]
dronning maud land constant frequencies ice ghz geometry density firn Physical Geography Geology
Forskningsprogram
SWEDARP 2007/08, JASE
Identifikatorer
URN: urn:nbn:se:polar:diva-1932OAI: oai:DiVA.org:polar-1932DiVA, id: diva2:810202
Merknad

ISI Document Delivery No.: 640FJ Times Cited: 4 Cited Reference Count: 32 Sugiyama, Shin Enomoto, Hiroyuki Fujita, Shuji Fukui, Kotaro Nakazawa, Fumio Holmlund, Per Sugiyama, Shin/C-2511-2012 National Institute of Polar Research, Tokyo; Swedish Polar Research Secretariat; Japanese Ministry of Education, Science, Sports and Culture [20241007] We thank the members of the JASE 2007/08 for their help in the field. The field activity was a part of the 48th and 49th Japanese Antarctic Research Expedition and supported by the National Institute of Polar Research, Tokyo, and the Swedish Polar Research Secretariat. The snow fork was kindly loaned by K. Fujita of Nagoya University. The surface elevation data used for the map were provided by the US National Snow and Ice Data Center. We thank two anonymous referees for providing careful reviews, and the scientific editor A.M. Smith for handling the paper. This study was funded by the Japanese Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (A), 20241007, 2008-2010. 4 Int glaciol soc Cambridge Geography, Physical; Geosciences, Multidisciplinary

Tilgjengelig fra: 2015-05-06 Laget: 2015-05-06 Sist oppdatert: 2017-12-04

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