| High wind speed events are a frequent occurrence downstream of Cape Farewell, Greenland in synoptic situations characterized by low-level westerly/northwesterly flow. It has been suggested that the dynamics of these so-called tip jets are governed by the conservation of the Bernoulli function, which leads to an acceleration as air parcels undergo orographic descent on the eastern (leeward) side of Greenland. In addition, it has been proposed that the air-sea interaction associated with tip jets plays a role in triggering deep oceanic convection in the lee of Greenland. Recent work has however shown that the surface layer parameterization in many numerical models have roughness length formulations for heat and moisture that are biased high in conditions such as those associated with tip jets. In this presentation, we will show results of one such event from a numerical model whose surface layer parameterization has been validated against observations in conditions similar to those observed during tip jet events. |
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