Figure 2: Wintertime mixed layer depth distribution.
From: Irminger Sea deep convection injects oxygen and anthropogenic carbon to the ocean interior
February–April mixed layer depths greater than 80% of the deepest recorded mixed layer depth for individual Argo floats (triangles), Irminger Sea cruise data (58GS20150410) collected in April (squares) and Labrador Sea cruise data (2015006HUD) colleceted in May (diamonds). Note that mixed layers for May Labrador Sea cruise data were isolated from the sea surface. Mixed layer depths were calculated using a semi-subjective method following Pickart et al.22. (a) Winter 2014–2015 data with 2000–2007 average winter mixed layer depths as contours20. The crosses show locations of all data points. The white box shows the region in the Irminger Sea selected for further analysis. (b) Mean potential density anomaly (σ0) over the winter mixed layer of the February–April Argo data for 2013 (blue scale), 2014 (grey scale) and 2015 (red scale). The vertical lines show longitude bounds for the Irminger Sea region.
