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SUMMARY:Investigation of fine-scale englacial structure using phase-sensit
 ive and polarimetric radar sounding - Tom Jordan\, University of Bristol 
DTSTART:20191029T130000Z
DTEND:20191029T140000Z
UID:TALK133225@talks.cam.ac.uk
CONTACT:Dr Maria Vittoria Guarino
DESCRIPTION:Radar sounding is a geophysical technique that enables investi
 gation of the subglacial and englacial properties of ice sheets. Typically
 \, glaciological information is extracted from geometric analysis of radar
  images (e.g. bed topography and internal ice layering) or radiometric ana
 lysis of the power (e.g. subglacial water and ice temperature). However\, 
 recent advances in phase-sensitive radar sounding provide new opportunitie
 s to investigate `fine-scale’ englacial structure at length-scales beyon
 d the conventional vertical resolution.\n\nIn the first part of the semina
 r I will describe a new phased-based polarimetric technique to measure ice
  fabric: the orientation distribution of ice crystals. Ice fabric is an im
 portant\, but often overlooked\, component of ice rheology and provides in
 formation about past ice deformation. I will describe application of the t
 echnique to slow-flowing ice in the NEEM divide region of Greenland\, and 
 fast-flowing ice in Rutford Ice Stream\, West Antarctica (as part of the B
 EAMISH project). In the second part of the seminar I will describe proof-o
 f-concept for estimation of englacial (vertical) velocity using repeat-pas
 s interferometry applied to airborne radar sounding data. Previous estimat
 ion of englacial velocity has been done using the ground-based ApRES\, and
  the adaptation to airborne data is a step toward mapping the 3D velocity 
 structure of ice sheets.\n
LOCATION:British Antarctic Survey\, Seminar Room 330b
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