Figure 4. Remote sensing imagery of distribution of fronts.

Seasonal oceanic front frequency map indicating the percentage of time a strong front was observed at each location during spring (Mar-May), derived from merged microwave and infrared SST (Sea Surface Temperature) data, 2007–2009. Blue arrows are inferred paths of branches of the North Atlantic Current (NAC) delineating the sub-polar front. Frontal features related to bathymetry are labelled: B - Rockall Bank, C - Iceland-Greenland branch of NAC, H - deeper hollow in sea bed, M - recurring meander, N - near to MAR, PAP – Porcupine Abyssal Plain, PSB – Porcupine Seabight, R – Reykjanes Ridge.