IAOOS winter SIMBA data during N-ICE 2015 North of Svalbard

• Main Authors: Sennéchael, Nathalie, Provost, Christine, Villacieros-robineau, Nicolas, Calzas, Michel, Guillot, Antoine, Savy, Jean-philippe, Garracio, Magali, Koenig, Zoé
• Format: Dataset
• Language: unknown
• Published: SEANOE 2015
• Subjects: sea ice; snow; ice growth; basal melt; flooding; snow-ice; mass balance; Arctic; Arctic Ocean; Svalbard; Sea ice
• Online Access: https://doi.org/10.17882/59624

Two ice mass balance instruments (part of IAOOS7 and IAOOS8 platforms) deployed near 83°N on the same ice floe, documented the evolution of snow and ice conditions in the Arctic Ocean north of Svalbard in Jan-Mar 2015. Frequent profiles of temperature (every 3 hours) and temperature change after 30s and 120s heating (once a day) were recorded. The ratio of the temperature changes after heating provides a proxy for thermal diffusivity. Both instruments documented flooding and snow-ice formation. Flooding was clearly detectable in the simultaneous changes in thermal diffusivity proxy, increased temperature, and heat propagation through the underlying ice. Slush then progressively transformed into snow-ice. Flooding resulted from two different processes; i) after storm-induced break-up of snow-loaded floes for IAOOS8 and ii) after loss of buoyancy due to basal ice melt for IAOOS7. The instrument on IAOOS7 documented basal sea-ice melt over warm Atlantic waters and ocean-to-ice heat flux peaked at up to 400 Wm-2 in winter.