Aarhus University Seal / Aarhus Universitets segl

IMPACT OF OCEAN HEAT ON LANDFAST ICE AND TIDEWATER GLACIERS

2015.03.24 | Egon Randa Frandsen

Date Sat 11 Apr Sat 23 May
Time 00:00    00:00
Location Station Nord, Greenland

The major objective of this project is to collect oceanographic data and consider the physical mechanisms that potentially impact the landfast sea ice and tidewater glaciers (and vice versa) in the Station North region. Relatively warm intermediate North Atlantic waters can be found at intermediate depths off the NE Greenland continental slope. These waters might penetrate along the submarine troughs and valleys into the shallow coastal areas where vertical mixing processes could initiate heat transport to the lower surface of sea ice. The impact of this heat on the sea-ice thermodynamic growth, brine rejection, buoyancy-driven mixing and the gas exchange will be studied. The tidewater glaciers might be even ablated directly at intermediate depths depending on local bathymetry that is currently unknown. Both short-term mooring deployments in the vicinity of the glacier-ocean contact zone, and long-term mooring observation under the land fast ice are selected as project priorities.

 

The project will start in April 2015 with regional oceanographic CTD survey (including the glacier area) and installation of ITP/CTD in the vicinity of glacier-ocean contact zone for ~30 days. In addition ADCP measurements, microstructure turbulence measurements (optional), and water sampling below the land-fast ice will be executed. An array of 3 moorings equipped with ADCP/CTD/ITP and mass balance buoys will be deployed for one year starting in leg 2, between the Prinsesse Margrethe island and Prinsesse Thyra island.

 

PI: Igor Dmitrenko/Sergie Kirillov (CEOS)

Participants: Igor Dmitrenko, Sergei Kirillov, Vlad Petrusevich, Wieter Boone (CEOS)

Environment, climate and energy, Arctic Research Centre