Abstract
It has been speculated that low‐level reverse tip‐jets, caused by the interaction of synoptic‐scale atmospheric flow and Greenland, are an important mechanism for forcing open ocean convection in the south‐east Labrador Sea. Here float data and meteorological reanalysis fields from the winter of 1996/1997, in combination with a simple mixed‐layer ocean model, are used to show that, although relatively deep ocean convection did occur during this winter, the primary forcing mechanism was cold‐air outbreaks from the Labrador coast rather than the smaller scale reverse tip‐jets. During this winter, the North Atlantic Oscillation (NAO) was in a weak positive phase. Similar treatments of the winters of 1994/1995 (strong, positive NAO) and 1995/1996 (strong, negative NAO) suggest that the result is robust regardless of the state of the NAO.
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