Radar sounding data of the ice sheet measured using 179 MHz polarimetric radar during the JASE traverse 2007/2008

Radio techniques were very important in the JASE traverse to detect subsurface conditions continuously. We used variety of radars and microwave radiometers to survey the englacial and subglacial environment. First, we used three radars to investigate ice thickness and the internal structure. They are (i) 179 MHz pulse-modulated radar which detects phase and polarization of both along and across the track, (ii) a 179 MHz pulse modulated radar and (iii) 60 MHz pulse modulated radar. These radars recorded continuous data along the traverse line. Second, we used two radars to understand shallow conditions (<~100 m) of snow and firn. One was a Snow Radar. Another was a Ground Penetrating Radar (GPR) with a 270 MHz antenna. Third, we used 5 channels of microwave radiometers to understand the radio emission and shallow structure of the ice sheet. They are 6 GHz (V and H), 18 GHz (V) and 36 GHz (V and H). A suite of these radio-glaciology measurements accomplished invaluable sets of field data to better understand internal structure of the Antarctic ice sheet in a very wide area. This data set is for radar (i). The radar was operated along a route “S16 – Mizuho – Dome Fuji- JASE Meeting Point (75°53’S; 25°50’E; 3661 m a.s.l.) – Dome Fuji”. We used two pulse widths, 500 ns and 60 ns. Antennas were three elements Yagi type. Orientation dependency is also measured everyday at the camp site.