Tuesday, 22 August 2017
Department of Physics
"Brine Convection, Temperature Fluctuations and Permeability in Winter Antarctic Land-Fast Sea Ice"
Vertical temperature strings are used in sea ice reseach to study heat flow, ice growth rate, and ocean-ice-atmosphere interaction. We demonstrate the feasibility of using temperature fluctuations as a proxy for fluid movement, a key process to resupply nutrients to Antarctic land-fast sea ice algal communities. Temperature fluctuations in thick Antarctic land-fast sea ice occur sporadically near the ice-ocean interface where temperature is >-3°C. Assuming temperature fluctuations occur when the Rayleigh number exceeds its critical value ~10, the permeability is approximated for two different ice structures: columnar and incorporated platelet ice. Columnar and incorporated platelet ice permeability distributions in the bottom 0.1m of winter Antarctic sea ice are not significantly different when comparing the two ice types.
WHEN: Tuesday 22 August 2017
WHERE: Room G400, Science 3 Building
TIME: 3.00 pm–4.00 pm
All interested are welcome to attend
Light refreshments to follow in Common Room