A model for computing small-scale wind variations over a water surface

Venkatesh, S.; Danard, Maurice B.

doi:10.1007/bf00123988

Cited by 6 publications

(2 citation statements)

References 28 publications

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“…Another quantity that can be used for the analysis of the ice breeze is the geostrophic wind G m averaged over the ABL depth. The relation between G m and the actual wind speed in the ABL was well studied for a horizontally quasi‐homogeneous baroclinic ABL [e.g., Arya and Wyngaard , ; Venkatesh and Danard , ; Brown , ; Sorbjan , ]. Therefore, we consider G m at some distance from the ice edge where horizontal inhomogeneities in the convective ABL become small.…”

Section: Ice‐breeze Characteristicsmentioning

confidence: 99%

Idealized dry quasi 2‐D mesoscale simulations of cold‐air outbreaks over the marginal sea ice zone with fine and coarse resolution

et al. 2013

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[1] A nonhydrostatic model (NH3D) is used for idealized dry quasi 2-D simulations of Arctic cold-air outbreaks using horizontal grid spacings between 1.25 and 60 km. Despite the idealized setup, the model results agree well with observations over Fram Strait. It is shown that an important characteristic of the flow regime during cold-air outbreaks is an ice-breeze jet (IBJ) with a maximum wind speed exceeding often the large-scale geostrophic wind speed. According to the present simulations, which agree very well with those of another nonhydrostatic mesoscale model (METRAS), the occurrence, strength, and horizontal extent L of this jet depend strongly on the external forcing and especially on the direction of the large-scale geostrophic wind relative to the orientation of the ice edge. The latter dependency is explained by the effects of the thermally induced geostrophic wind over open water and Coriolis force. It is found that coarse-resolution runs underestimate the strength of the jet. This underestimation has important consequences to the surface fluxes of heat and momentum, which are also underestimated by about 10-15% on average over the region between the ice edge and 120-180 km downstream. Our results suggest that a grid spacing of about L/7 is required (about 10-30 km) to simulate the IBJ strength with an accuracy of at least 10%. Thus, the results of large-scale models as well might contain uncertainties with regard to the simulated IBJ strength which would influence the energy budget in a large region along the marginal sea ice zones.

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Section: Ice‐breeze Characteristicsmentioning

confidence: 99%

Idealized dry quasi 2‐D mesoscale simulations of cold‐air outbreaks over the marginal sea ice zone with fine and coarse resolution

et al. 2013

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“…The model is an adaptation of the one-layer models employed by Danard (1977) and Venkatesh and Danard ( 1978). The reader is referred to these two papers for details of the procedures employed.…”

Section: Description Of the Modelmentioning

confidence: 99%

Modelling winds in Lancaster sound and Northwestern Baffin Bay

Danard

Thompson

1983

Atmosphere-Ocean

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A one-level primitive equations mesoscale wind model is applied to the area of Petro-Canada's oil explorations in eastern Lancaster Sound and northwestern Baffin Bay. The model includes effects of orographic channelling, land-water roughness contrasts, and thermal circulations such as land-and sea-breezes and anabatic and katabatic winds. The grid sizeislO' latitude by 40' longitude (approximately 19 km by 20 km). The model is verified with ship winds in the 1978 and 1979 seasons and with Seasat satellite winds in September 1978. Two versions of the model have been investigated. In the first, termed model A, the geostrophic wind was set equal to the analysed Canadian Meteorological Centre (CMC) wind ata = p/p s = 0.94. Herep is pressure and p s is surface pressure. In the second version, model B, the geostrophic wind is obtained from sea-level pressures manually abstracted from surface charts. The latter had been reanalysed after Petro-Canada and delayed ship reports had been plotted. The improvement of model B over model A is significant. The mean underestimate in speed has decreased from 12.0 to 7.8 km h-1 for the ship winds and from 22.6 to 11.2 km h-1 for the Seasat winds. Fifty per cent of the angle errors now lie between-31 and 49° for the ship winds and between-11 and 31° for the Seasat winds. The corresponding figures for model A are-54 and 71° for the ship winds and-14 and 47° for the Seasat winds. The model is also run with prognostic CMC input data. In general, errors grow slowly with time from 0 to 36 h. RÉSUMÉ Un modèle de vent à niveau unique et à échelle moyenne utilisant les équations primitives est appliqué à la région d

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Ocean Surface Features Observed by HF Coastal Ground-Wave Radars: A Progress Review

Barrick

Lipa

1979

Ocean Wave Climate

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A model for computing small-scale wind variations over a water surface

Cited by 6 publications

References 28 publications

Idealized dry quasi 2‐D mesoscale simulations of cold‐air outbreaks over the marginal sea ice zone with fine and coarse resolution

Idealized dry quasi 2‐D mesoscale simulations of cold‐air outbreaks over the marginal sea ice zone with fine and coarse resolution

Modelling winds in Lancaster sound and Northwestern Baffin Bay

Ocean Surface Features Observed by HF Coastal Ground-Wave Radars: A Progress Review

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