Results from a 3-D ocean model Keith Makinson

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Presentation transcript:

Ocean circulation and water mass transformation beneath Filchner-Ronne Ice Shelf: Results from a 3-D ocean model Keith Makinson British Antarctic Survey, Cambridge, U.K.

FRIS sub-ice shelf circulation (OBS) Bathymetry contours in 100’s of metres (after Nicholls and Østerhus, 2004)

Model domain Bathymetry MICOM with ice shelves Weddell Sea Filchner Depression Berkner Shelf Ronne Depression km MICOM with ice shelves 0.35o grid (9 km x 9 km @ 76.5oS) 15 isopycnic layers + mixed layer Season surface salinity forcing Tidal forcing Run for 20 years

HSSW inflow & pooling in deep depressions Layer 16 Weddell Sea Layer thickness Berkner Shelf Layer 15 Filchner Depression Layer 12 Filchner Ice Shelf

How do dense water masses escape the deep depressions ? (1) Interact with ice shelf (i.e. follow Gade line) (2) Mix with other water masses Fox sites Weddell Sea Sill ISW Ronne Depression Ronne Ice Shelf Filchner Ice Shelf

Filchner Depression – mean annual circulation Meltwater fraction (ppt)

Filchner Depression – mean annual circulation Meltwater fraction (ppt)

Filchner-Ronne Ice Front CTD sections From Gammelsrod et al, 1994

Filchner Ice Front temperature & velocity at 600 m

Filchner Ice Front temperature & velocity at 200 m

Filchner Ice Front temperature & velocity at 800 m

Filchner Ice Front mixing (1) Interact with ice shelf i.e. follow Gade line (2) Mix with other water masses Coastal Current Berkner Shelf Sill ISW Fox sites Filchner Ice Front

Meridional velocity & layer number at 77.5oS cm/s 600m

Filchner Sill Layer 10 velocity FR1 FR2 FR1 FR2 Meridional velocity Layer thickness (m) FR1 FR2 Layer 10 velocity Meridional velocity & layer number at 75oS cm/s FR1 FR2

FRIS sub-ice shelf circulation (Obs)

FRIS sub-ice shelf circulation (Model)

Summary Dense water inflows routes similar to observations Recirculation in Filchner Depression limited to ice front region Primary ISW outflow occurs on eastern side of the depression Convergence and mixing of water masses at Filchner Ice Front results in ISW that can escape over the sill The northward flow of ISW is gathered along to the eastern slope of Filchner Depression