Ice-physics transects collected in fast ice areas at Davis Station in November-December 2015

In situ measurements of ice and snow thickness, and freeboard along an irregular transect on the fast, complementing the repeat ROV (Remotely Operated Vehicle) transects. During our deployment at Davis in 2015 logistics and environmental conditions permitted measurements along 4 transects. The location of the reference grid (ROV box) had its origin (x=0, y=0) at (-68.568904 degrees N,+77.945439 degrees E). Transects 1 – 4 started at x=60, x=70, x=80 and x=90 m and were sampled at y-positions of 0m, 0.5m, 1m, 2m, 4m, 8m, 16m, 32m, 64m, 128m, (256m, and 512m), respectively. Depending on working conditions the overall transect lengths varied from 128 – 512 m.Sampling dates for in situ ice physcis: Transect ID    Date of sampling    Zice and FB measured at    Ice core taken at    Snowpit measured atT1    19/11/2015    0, 0.5, 1, 2, 4, 8, … 64m.    0m, 128m, 512m    0m, 128m, 512mT2    23/11/2015    0, 0.5, 1, 2, 4, 8, … 64m.    0m, 128m, 512m    0m, 128mT3    29/11/2015    0, 0.5, 1, 2, 4, 8, … 64m.    0m, 128m    0m, 128mT4    02/12/2015    0, 0.5, 1, 2, 4, 8, … 64m.    0m, 128m    0m, 128mIce cores and snow pits were collected at the 0m, 50m and 100m mark along the transect, where possible. Additionally, ice cores for density analysis were taken at a few of the ice-core sites for independent verification of ice density.