Drill hole measurements of fast ice and sub-ice platelet layer thickness, and snow depth in McMurdo Sound - November 2017 ...

• Main Authors: Langhorne, Patricia J, Leonard, Gregory, Brett, Gemma Marie, Rack, Wolfgang, Haas, Christian, Fraser, Eamon, Xie, Hongjie, Bault, Jennifer, Gao, Yongli
• 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; Deep South National Science Challenge Targeted observations and process-informed modeling of Antarctic sea ice TOPOMASI; Polynyas, ice production, and seasonal evolution in the Ross Sea PIPERS; Antarc*; Antarctic; McMurdo Sound; Ross Sea; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.933076; https://doi.pangaea.de/10.1594/PANGAEA.933076

The thicknesses of sea ice and sub-ice platelet layer were measured at regular intervals on fast ice in McMurdo Sound, Antarctica in November of 2017. 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 MagnaProbe. 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 measurement is ...