The data set comprises a collection of 5 digital terrains models (DTMs) showing the sea ice surface topography for ponded first year ice during the 2012 July–August ICE12/ACCESS cruise north of Svalbard onboard R/V “Lance” in the southwestern Nansen Basin (82.3◦ N, 21.5◦ E). ICE12 drift north of Svalbard in July-August 2015. ICE12 featured an eight-day ice station, 26 July to 3 August 2012, in an area of very close, 9/10 concentration, drift ice. The ice floe that “Lance” was moored to during the drift had a diameter of approximately 600 m and a modal ice thickness of 0.8 m. The surface topography for 5 segments of ICE12 floe is derived using photogrammetry from the series of images acquired by ICE camera setup during survey flights on 28.07.2012 and 31.07.12. Data are presented on a regular 2 cm mesh in UTM coordinates and covers the areas from 11000 to 14000 m2 per segment . As an output formats the ascii XYZ table is used.

Samples for Uranium 236 and I 129. Collected on ship CTD during cast 42 and 44 in June between 5m and 400m depth.

Ocean microstructure profile from a lead during leg 2 (floe 2) with VMP250 microstructure profiler

Sensible & latent heat fluxes, momentum flux, roughness length, boundary layer height, and CO2 flux from intermittent deployments of eddy-covariance system by KOPRI scientists.

Temperature, Humidity, wind speed and direction (radiosondes), boundary layer height

Cloud mask, base height, top-height, phase, and boundary layer height

Bromoform (CHBr3) fluxes from sea ice measured with chamber technique

Methane (CH4) fluxes from sea ice measured using chambers

Microtcats and Tinytags deployed on a rope measured ocean temperature from surface down to 100 m depth.

Processed, quality-controlled data from the 300 kHz RDI ADCP (SN 20687) deployed from the ice floe 22 January - 21 February, 2015.