期刊
OCEAN DYNAMICS
卷 65, 期 11, 页码 1535-1546出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10236-015-0883-1
关键词
Fjord circulation; Subglacial freshwater discharge; Heat transport; Tidewater outlet glacier; Ocean glacier interaction; Buoyant plume convection
类别
资金
- IIKNN Greenland
- Danish Agency for Science, Technology and Innovation
- Danish Energy Agency
- Aage V. Jensen Charity Foundation
- Greenland Climate Research Centre activities
- Greenland Ecosystem Monitoring Program
- Nordic Centre of Excellence program (DEFROST)
- National Science Foundation [UAF 10-0033A]
- Canada Excellence Research Chair (CERC) Program
Tidewater outlet glaciers are directly connected to the ocean via ice walls or floating shelves. Melting and freezing of ice, runoff, englacial, and subglacial discharge of freshwater and ocean heat transport are therefore potential feedback processes between glacial ice flow and ocean circulation. Subglacial discharge occurs at the base of tidewater glacier outlets where out-flowing freshwater forms a convective buoyant plume ascending close to the glacier face and, due to entrainment, transports relatively warm and saline ambient bottom water up towards the surface. Plume dynamics, typically occurring at sub-grid scales in regional ocean models, therefore has to be parameterized in areas where ice-ocean interactions occur, as for example in Arctic fjords. Here, we develop and analyze a new simple boundary condition of subglacial discharge where entrainment-induced transport between the subsurface and surface layer is described. A sensitivity study showed that subglacial discharge increased ocean heat transport near the glacier whereas the impact from plume-entrainment became relatively small further from the glacier. Subglacial discharge was shown to have a significant influence on surface concentrations. The impact from subglacial discharge was demonstrated in a regional model of GodthAyenbsfjord (64A degrees N), located at the west coast of Greenland, where surface concentrations near the glacier were shown to be sensitive to subglacial discharge in accordance with observations.
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