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Straneo (2006) investigated the processes involved in deep convection and restratification in the central Labrador Sea, using data from two different time periods. She noted that the source of heat for the central Labrador Sea is warm Irminger Water that is ��advected into the basin, between 200 and 700?m, by the cyclonic boundary system.�� She further noted that this region experiences net surface heat loss to the atmosphere, balanced by a ��convergence into the region due to the oceanic circulation,�� but she could not establish a PI3K inhibitor correlation between these two mechanisms. Here we take a different approach, and consider the poleward ocean heat transport across AR7W, the divergence or convergence of heat in the oceanic volume lying between AR7W and Davis Strait, and the surface heat loss to the atmosphere integrated over the entire area of the Labrador Sea north of AR7W. This method integrates over regional Selleck JQ1 scale processes to give a larger-scale picture of the contribution of the Labrador Sea to the meridional overturning circulation. In order to make a meaningful estimate of ocean heat transport into a closed basin, it is necessary to balance mass transport (Hall and Bryden, 1982). In theory, the net mass transport crossing the AR7W line must balance any net flow through Davis Strait, because: (1) PS2007 have shown that the Ekman contribution to cross-track mass transport is small; (2) at Hudson Strait a northwest flow into the Hudson Bay approximately balances the southeastward outflow, though the properties of the in- and out-flowing waters differ (Drinkwater, 1988); and (3) contributions from freshwater sources are several orders of magnitude smaller than transports crossing AR7W (Khatiwala et al., IRS1 2002). Curry et al. (2011) reported on mass, heat and freshwater fluxes crossing Davis Strait based on a one-year deployment (September, 2004, through August, 2005) of 14 moorings with instrumentation measuring velocity, temperature and conductivity. They found annual mean mass, heat, and freshwater fluxes of ?2.3?Sv, 20?TW, and ?116?mSv (heat flux was calculated relative to 0��?C and freshwater flux relative to 34.8). Peak mass transport occurs in June and is about 4?Sv southward; in that month heat flux is minimal, about 5�C10?TW poleward. Two points allowed PS2007 to make a meaningful calculation of ocean heat flux crossing AR7W. First, they assumed that the Davis Strait flow, coming from depths less than 600?m (the sill depth) and densities mostly lighter than �Ҧ�