Sea ice measurements and modelling of the Storfjorden polynya

Lars H. Smedsrud, Ragnheid Skogseth, W. Paul Budgell, Frank Nilsen, Alastair D. Jenkins, and Bjørn Ådlandsvik

Biggs et al. 2000

Smedsrud and Skogseth (2006)

Frazil collection thickness & Wind speed

Björk (2000) no length dependancy

Alam & Curry 1998

Frazil forms > 4.5 m/s wind !!

Helicopter Electro Magnetic bird campaign, Storfjorden 2006

S. Hendricks and C. Haas (AWI) S. Gerland (NPI)L.H. Smedsrud (BCCR) F. Nilsen (UNIS)

Flight track on May 2. 2006

(km)

WestEast (Kapp Lee)

South

Scottish Association for Marine Science (SAMS)Ice drifting buoys.

Jeremy Wilkinson andDuncan Mercer (SAMS)

Budgell (2005)

Boundary forcing and initialization from large scale Atlantic ROMS runs

Sea ice concentration

Sea surface temperature

Model ice thickness 'validation'

- a polynya closing event

3 February2000

Sea ice classification and polynya area detected by SAR

Skogseth et al (2004)

Mean icethickness<0.3m = polynya

ROMS model resultsSmedsrud et al (2006)

Wind forcing

0.3 N/m²equals

12-15 m/s

NCEP forcing,Δx = 250 km

Surface fluxesreflects NCEPice cover

[W/m²]

Storfjorden defined by

Polynya area calculated inside the limited area

Typical polynya width of 20 km

February 2000 mean ice thickness

[ m ]