Abstract
The existence of a low-level (z=~1000 m) jet adjacent to a sea-ice boundary is investigated with a two-dimensional numerical model. A thermally-direct ice breeze circulation is induced by specifying an ice-sea surface temperature gradient, with the mean geostrophic wind parallel to the ice edge. Pressure changes associated with over-water mixed-layer development create an increase in geostrophic velocity that accounts for most of the increase in wind speed. A change in initial geostrophic wind direction has significant effects on location and intensity of the low-level jet; geostrophic winds parallel to the ice edge result in stronger jets than occur with cross-ice geostrophic winds. An inertial oscillation simulated by the model in 1-D makes a negligible contribution to the low-level jet.
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Langland, R.H., Tag, P.M. & Fett, R.W. An ice breeze mechanism for boundary-layer jets. Boundary-Layer Meteorol 48, 177–195 (1989). https://doi.org/10.1007/BF00121789
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DOI: https://doi.org/10.1007/BF00121789