Drill hole measurements of fast ice and sub-ice platelet layer thickness, and snow depth in McMurdo Sound - November/December 2011 ...

• Main Authors: Langhorne, Patricia J, Leonard, Gregory, Gough, Alexander J, Hughes, Kenneth G, Haas, Christian, Beckers, Justin F, Price, Daniel, Barnsdale, Kelvin, Rack, Wolfgang, Brett, Gemma Marie
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Antarctica; Fast ice; Freeboard; Snow layer; Sub-ice platelet layer; Event label; Date/Time of event; Longitude of event; Latitude of event; Identification; Sea ice thickness; Sub-ice platelet-layer thickness; Snow thickness; Ice drill; Antarctic sea ice thickness Harbinger of change in the Southern Ocean AntSeaIce; Antarctic; Southern Ocean; McMurdo Sound; Antarc*; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.933079; https://doi.pangaea.de/10.1594/PANGAEA.933079

The thicknesses of sea ice and sub-ice platelet layer were measured at regular intervals on fast ice in McMurdo Sound, Antarctica in November and December of 2011. Thirty-metre cross-profiles were established at each site, and snow depths were measured at 0.5 m intervals along the transect lines with a metal ruler. A mean snow depth for each site was derived from these 120 measurements. Freeboard, sea ice thickness and sub-ice platelet layer thickness were recorded at five locations at each site - at the central crossing point and at the end points of each transect. The mean of these was then calculated and taken as representative of the site. Ice thicknesses were measured by using a tape measure with a brass T-anchor attached at the zero mark. This was deployed vertically through the drill-hole and allowed to rotate to a horizontal alignment when exiting the bottom of the drill-hole at the ice-ocean interface. From this position the anchor is slowly pulled upwards until some resistance is met and the first ...