Modelling winds in Lancaster sound and Northwestern Baffin Bay

Danard, Maurice B.; Thompson, Bill

doi:10.1080/07055900.1983.9649156

Cited by 2 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is also no unique primary atmospheric input to ice models. Boundary layer winds can be obtained from largescale (150-400 km) numerical weather prediction models run at various weather centers or from regional models [Danard and Thompson, 1983]. In both cases the wind is defined by the structure of the model.…”

Section: Geostrophic Wind/surface Wind and Stress Relationshipsmentioning

confidence: 99%

Atmospheric boundary layer structure and drag coefficients over sea ice

Overland

1985

J. Geophys. Res.

179

142

View full text Add to dashboard Cite

This paper estimates the air/sea drag coefficient for first‐year ice from recent aircraft measurements and reconciles the range of observed drag coefficients (103CD = 1.2–3.7 referenced to 10 m) for all sea ice types, based on ice roughness and seasonal meteorology. For the purpose of sea ice modeling, it is necessary to define an effective drag coefficient which relates regional stress to regional wind, because sea ice is heterogeneous on scales less than 20 km. Regional stress is influenced by the distribution of surface roughness, the buoyancy flux from quasi‐periodic leads, and external atmospheric conditions, principally the inversion height. 103CD is 1.3–1.5 for smooth ice but is much greater for nonflat surfaces. For wind speeds greater than 5 m/s and air temperatures below freezing, the effective 103CD is 2.5–3.0 for nearly continuous pack ice, such as first‐year ice in seasonal ice zones and central Arctic basin. The range of values of 103CD is 3.0–3.7 for unstable boundary layers typical of off‐ice winds in the marginal ice zone (MIZ) or even greater if the ice has been broken by a recent storm. CD values at the lower end of these ranges are associated with low inversion heights. These coefficients are confirmed by 103CD of 2.9, 2.5, and 3.1 for first‐year sea ice calculated from gust probe data collected by the NOAA P‐3 aircraft, interior to the inner MIZ in the Bering Sea during the Marginal Ice Zone Experiment (MIZEX‐West) in February 1983, and 103CD of 2.6 for the Arctic calculated from Arctic Ice Dynamics Joint Experiment (AIDJEX) aircraft data for February 1976. The effective drag coefficient with the presence of even a small concentration of sea ice is greater than the oceanic value as shown by a 103CD of 2.2 calculated from NOAA P‐3 gust probe data over a 40‐km track of 0.4 ice concentration in the outer MIZ of the Greenland Sea in June 1984 during MIZEX‐84. The relation of surface wind and stress to the geostrophic wind for shallow inversion heights, typical of high latitudes, is reviewed with a turbulent closure atmospheric boundary layer model. The winter Arctic is typified by low inversions (<100 m), low geostrophic drag coefficients, and large geostrophic/surface wind turning angles, with low functional dependence on surface roughness. Seasonal ice zones are typified by a more modest influence of the inversion on boundary layer characteristics.

show abstract

Section: Geostrophic Wind/surface Wind and Stress Relationshipsmentioning

confidence: 99%

Atmospheric boundary layer structure and drag coefficients over sea ice

Overland

1985

J. Geophys. Res.

179

142

View full text Add to dashboard Cite

show abstract

A preliminary investigation using a Nova Scotia storm surge prediction model

et al. 1984

Self Cite

View full text Add to dashboard Cite

A test of a storm surge model using the shallow water equations is presented. The model is designed to be run using CMC (Canadian Meteorological Centre) prognostic data. The model incorporates a quadratic bottom friction term and is capable of including advective, topographic and tidal effects. It can simulate a moving land-sea boundary approximately. The model is applied to the east coast of Nova Scotia for the "Ground Hog Day" storm of February 1976. Meteorological forcing is calculated using subjectively analysed sea-level pressures. Away from open boundaries, the agreement with observed surge residuals is generally good. However, the results are less satisfactory near the boundaries. CMC meteorological data are found to underestimate the surface wind stress during this period. RÉSUMÉ Un modèle de marées de tempête qui emploie les équations d'eau peu profonde est ici présenté. Le modèle est conçu pour utiliser les prévisions de vent du CMC (Centre météorologique canadien). Le modèle utilise une friction de fond quadratique et peut inclure les effets d'advection, de reliefet de marée. Il peut simuler approximativement une interface mobile entre la mer et la terre.

show abstract

Modelling winds in Lancaster sound and Northwestern Baffin Bay

Cited by 2 publications

References 4 publications

Atmospheric boundary layer structure and drag coefficients over sea ice

Atmospheric boundary layer structure and drag coefficients over sea ice

A preliminary investigation using a Nova Scotia storm surge prediction model

Contact Info

Product

Resources

About