Langhorne, Patricia J; Leonard, Gregory; Brett, Gemma Marie; Rack, Wolfgang; Haas, Christian; Fraser, Eamon; Xie, Hongjie; Bault, Jennifer; Gao, Yongli (2021): Drill hole measurements of fast ice and sub-ice platelet layer thickness, and snow depth in McMurdo Sound - November 2017 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.933076
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
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 taken. This resistance is taken to mark the sub-ice platelet layer/ocean interface. The tape measure is then pulled harder, forcing the bar to pass through the sub-ice platelet layer until it sits flush against the sea ice/sub-ice platelet layer interface where a second measurement is taken. Measurement sites were about 10 km apart.
Related to:
Brett, Gemma Marie; Irvin, Anne; Rack, Wolfgang; Haas, Christian; Langhorne, Patricia J; Leonard, Greg H (2020): Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf. Journal of Geophysical Research: Oceans, 125(3), e2019JC015678, https://doi.org/10.1029/2019JC015678
Brett, Gemma Marie; Leonard, Gregory; Rack, Wolfgang; Haas, Christian; Langhorne, Patricia J (in review): Winter growth and tidal variability of the sub-ice platelet layer observed with electromagnetic induction soundings. The Cryosphere Discussions, https://doi.org/10.5194/tc-2021-61
Brett, Gemma Marie; Price, Daniel; Rack, Wolfgang; Langhorne, Patricia J (2021): Satellite altimetry detection of ice-shelf-influenced fast ice. The Cryosphere, 15(8), 4099-4115, https://doi.org/10.5194/tc-15-4099-2021
Haas, Christian; Langhorne, Patricia J; Rack, Wolfgang; Leonard, Greg H; Brett, Gemma Marie; Price, Daniel; Beckers, Justin F (2021): Airborne mapping of the sub-ice platelet layer under fast ice in McMurdo Sound, Antarctica. The Cryosphere, 15(1), 247-264, https://doi.org/10.5194/tc-15-247-2021
Hoppmann, Mario; Richter, Maren E; Smith, Inga J; Jendersie, Stefan; Langhorne, Patricia J; Thomas, David N; Dieckmann, Gerhard S (2020): Platelet ice, the Southern Ocean's hidden ice: a review. Annals of Glaciology, 61(83), 341-368, https://doi.org/10.1017/aog.2020.54
Project(s):
Funding:
National Science Foundation (NSF), grant/award no. 134717: Polynyas, ice production, and seasonal evolution in the Ross Sea
Coverage:
Median Latitude: -77.627268 * Median Longitude: 165.041891 * South-bound Latitude: -77.842300 * West-bound Longitude: 163.802970 * North-bound Latitude: -77.181894 * East-bound Longitude: 166.400000
Date/Time Start: 2017-11-02T00:00:00 * Date/Time End: 2017-11-21T00:00:00
Event(s):
McMurdo-2017_1 * Latitude: -77.816667 * Longitude: 166.200000 * Date/Time: 2017-11-04T00:00:00 * Location: McMurdo Sound * Method/Device: Ice drill (ICEDRILL)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Brett, Gemma Marie | |||
| 2 | Date/Time of event | Date/Time | Brett, Gemma Marie | |||
| 3 | Longitude of event | Longitude | Brett, Gemma Marie | |||
| 4 | Latitude of event | Latitude | Brett, Gemma Marie | |||
| 5 | Identification | ID | Brett, Gemma Marie | Object | ||
| 6 | Sea ice thickness | EsEs | m | Brett, Gemma Marie | ||
| 7 | Sub-ice platelet-layer thickness | SIPL | m | Brett, Gemma Marie | ||
| 8 | Freeboard | Freeboard | m | Brett, Gemma Marie | ||
| 9 | Snow thickness | Snow thick | m | Brett, Gemma Marie |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
115 data points
Data
| 1 Event | 2 Date/Time | 3 Longitude | 4 Latitude | 5 ID | 6 EsEs [m] | 7 SIPL [m] | 8 Freeboard [m] | 9 Snow thick [m] |
|---|---|---|---|---|---|---|---|---|
| McMurdo-2017_23 | 2017-11-02 | 166.0000 | -77.8333 | 1 | 2.15 | 1.32 | 0.16 | 0.22 |
| McMurdo-2017_2 | 2017-11-03 | 166.4000 | -77.7667 | 2 | 1.89 | 0.81 | 0.09 | 0.27 |
| McMurdo-2017_3 | 2017-11-03 | 166.0000 | -77.7667 | 3 | 1.95 | 1.29 | 0.07 | 0.34 |
| McMurdo-2017_1 | 2017-11-04 | 166.2000 | -77.8167 | 4 | 2.14 | 0.98 | 0.15 | 0.22 |
| McMurdo-2017_7 | 2017-11-04 | 166.4000 | -77.6667 | 5 | 1.87 | 0.12 | 0.12 | 0.17 |
| McMurdo-2017_4 | 2017-11-06 | 165.6000 | -77.7667 | 6 | 2.22 | 3.01 | 0.20 | 0.19 |
| McMurdo-2017_22 | 2017-11-06 | 165.6000 | -77.8333 | 7 | 2.35 | 5.78 | 0.30 | 0.10 |
| McMurdo-2017_5 | 2017-11-08 | 165.2000 | -77.7667 | 8 | 2.23 | 3.25 | 0.21 | 0.14 |
| McMurdo-2017_6 | 2017-11-08 | 164.8000 | -77.7667 | 9 | 2.26 | 1.64 | 0.23 | 0.05 |
| McMurdo-2017_11 | 2017-11-09 | 164.8000 | -77.6667 | 10 | 1.95 | 1.90 | 0.18 | 0.10 |
| McMurdo-2017_70 | 2017-11-09 | 164.5064 | -77.6667 | 11 | 1.97 | 0.22 | 0.18 | 0.04 |
| McMurdo-2017_20 | 2017-11-10 | 164.8000 | -77.8243 | 12 | 2.26 | 1.53 | 0.23 | 0.04 |
| McMurdo-2017_24 | 2017-11-10 | 164.8000 | -77.8423 | 13 | 3.87 | 1.61 | 0.42 | 0.05 |
| McMurdo-2017_21 | 2017-11-11 | 165.2000 | -77.8333 | 14 | 2.27 | 4.76 | 0.26 | 0.12 |
| McMurdo-2017_71 | 2017-11-14 | 163.9577 | -77.3735 | 15 | 1.96 | 0.18 | 0.16 | 0.10 |
| McMurdo-2017_76 | 2017-11-14 | 164.1844 | -77.4111 | 16 | 2.06 | 0.13 | 0.18 | 0.06 |
| McMurdo-2017_77 | 2017-11-14 | 163.9449 | -77.4603 | 17 | 1.87 | 0.34 | 0.15 | 0.10 |
| McMurdo-2017_75 | 2017-11-15 | 164.0847 | -77.2892 | 18 | 1.91 | 0.00 | 0.19 | 0.03 |
| McMurdo-2017_72 | 2017-11-18 | 163.8813 | -77.2795 | 19 | 1.99 | 0.19 | 0.15 | 0.15 |
| McMurdo-2017_73 | 2017-11-18 | 163.8030 | -77.1819 | 20 | 1.95 | 0.10 | 0.18 | 0.04 |
| McMurdo-2017_74 | 2017-11-18 | 163.9993 | -77.1819 | 21 | 2.00 | 0.13 | 0.19 | 0.03 |
| McMurdo-2017_EM31_1 | 2017-11-21 | 166.1997 | -77.7165 | 22 | 1.77 | 0.55 | 0.09 | 0.19 |
| McMurdo-2017_EM31_2 | 2017-11-21 | 165.6021 | -77.7166 | 23 | 1.94 | 1.05 | 0.14 | 0.12 |