Results 31 to 40 of about 1,522 (283)

AN AUTOMATIC EXTRACTION METHOD FOR ANTARCTIC SUBGLACIAL LAKE BASED ON RADIO ECHO SOUNDING DATA [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2021
Detection of subglacial lakes and interpretation their hydrological connectivity is of great importance to understanding the mass balance of Antarctic ice sheet.
D. Wang, D. Wang, T. Feng, T. Feng, T. Hao, T. Hao, R. Li, R. Li   +7 more
doaj   +1 more source

Morphology of bottom surfaces of glacier ice tongues in the East Antarctic region

Annals of Geophysics, 2001
During three Antarctic summer campaigns (1995/97/99) Radio Echo Sounding (RES) system data from some glacier ice tongues in the East Antarctic regions between Victoria Land and George V Land were collected.
E. Zuccheretti, A. Zirizzotti, A. Passerini, I. E. Tabacco, M. Chiappini, C. Bianchi   +5 more
doaj   +1 more source

Anisotropic scattering in radio-echo sounding: insights from northeast Greenland [PDF]

The Cryosphere
Anisotropic scattering and birefringence-induced power extinction are two distinct mechanisms affecting the azimuthal power response in radio-echo sounding (RES) of ice sheets.
T. A. Gerber, T. A. Gerber, D. A. Lilien, D. A. Lilien, N. F. Nymand, D. Steinhage, O. Eisen, O. Eisen, D. Dahl-Jensen, D. Dahl-Jensen   +9 more
doaj   +1 more source

Hydrothermal structure of a polythermal glacier in Spitsbergen by measurements and numerical modeling

Лëд и снег, 2016
Thickness of the upper cold ice layer in the ablation area of the polythermal glacier Grønfjordbreen (Spitsbergen) was estimated by means of numerical modeling.
A. V. Sosnovsky, Yu. Ya. Macheret, A. F. Glazovsky, I. I. Lavrentiev   +3 more
doaj   +1 more source

Deep multi-scale learning for automatic tracking of internal layers of ice in radar data

Journal of Glaciology, 2021
In this study, our goal is to track internal ice layers on the Snow Radar data collected by NASA Operation IceBridge. We examine the application of deep learning methods on radar data gathered from polar regions.
Maryam Rahnemoonfar, Masoud Yari, John Paden, Lora Koenig, Oluwanisola Ibikunle   +4 more
doaj   +1 more source

Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers [PDF]

Journal of Glaciology, 1975
An electromagnetic linearly-polarized signal transmitted through the glacier in a vertical direction, reflected from the bedrock, and received with a receiving antenna, is found to be changed into one either partially or elliptically polarized. The polarization changes are believed to be due mainly to the crystal structure of the glacier and anisotropy
V. V. Bogorodskiy, G. V. Trepov, B. A. Fedorov   +2 more
openaire   +1 more source

A compact lightweight multipurpose ground-penetrating radar for glaciological applications

, 2011
We describe a compact lightweight impulse radar for radio-echo sounding of subsurface structures designed specifically for glaciological applications. The radar operates at frequencies between 10 and 75 MHz.
Frolovskiy, K., Lapazaran Izargain, Javier Jesús, Machío, F., Navarro Valero, Francisco José, Vasilenko, Evgeniy   +4 more
core   +1 more source

Accidents and opportunities: a history of the radio echo-sounding of Antarctica, 1958–79 [PDF]

The British Journal for the History of Science, 2008
AbstractThis paper explores the history of radio echo-sounding (RES), a technique of glaciological surveying that from the late 1960s has been used to examine Antarctica's sub-glacial morphology. Although the origins of RES can be traced back to two accidental findings, its development relied upon the establishment of new geopolitical conditions, which
Siegert, Martin, Turchetti, S., Dean, K., Naylor, S.   +3 more
openaire   +3 more sources

Penetration of Antarctic subglacial lakes by VHF electromagnetic pulses: Information on the depth and electrical conductivity of basal water bodies

, 1999
Owing to the high level of absorption of very high frequency radio waves in water, previous investigators of airborne radio echo sounding (RES) data from Antarctica have assumed that the depth of subglacial lakes cannot be measured directly by this ...
Martin J. Siegert, Siegert, M. J., Michael R. Gorman, Gorman, M. R.   +3 more
core   +1 more source

Ice stream or not? Radio-echo sounding of Carlson Inlet, West Antarctica [PDF]

The Cryosphere, 2011
The Antarctic Ice Sheet loses mass to the surrounding ocean mainly by drainage through a network of ice streams: fast-flowing glaciers bounded on either side by ice flowing one or two orders of magnitude more slowly.
E. C. King
doaj   +1 more source