Ice shelf density reconstructed from optical televiewer borehole logging

• Published in: Geophysical Research Letters
• Main Authors: Hubbard, Bryn, Tison, Jean-Louis, Philippe, Morgane, Heene, Billie, Pattyn, Frank, Malone, Terry, Freitag, Johannes
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Wiley 2013
• Subjects: Roi Baudouin; Antarc*; Antarctica; Ice Shelf; Ice Shelves
• Online Access: https://epic.awi.de/id/eprint/34442/; https://epic.awi.de/id/eprint/34442/7/grl51094.pdf; https://hdl.handle.net/10013/epic.42690; https://hdl.handle.net/10013/epic.42690.d007

Optical televiewer luminosity logs are compared with densities measured gravimetrically on 520 snow, firn and ice samples from two locations of similar annual temperature (~-14 °C) and contrasting accumulation rates (0.23 and 0.43 m w.e. per year) on the Roi Baudouin Ice Shelf, Antarctica. At the scale of ≥10-1 m, an inverse exponential relationship (R2 = 0.96) is recorded between density and luminosity, indicating (i) that OPTV luminosity provides an effective proxy for density at such ice shelves, and (ii) that densities may be reconstructed from boreholes drilled elsewhere by hot water without the need for core material. Our analysis also suggests that this relationship may hold for newly-formed ice as well as for snow and firn. At the scale of ≤10-1 m, both luminosity and density show similar patterns, but precise correlation is confounded by detailed differences between the two records.