Fig. 1: Bivalve derived proxy records location and regional ocean circulation.
From: Destabilisation of the Subpolar North Atlantic prior to the Little Ice Age
Red arrows represent the relatively warm and salty waters carried northwards by the North Atlantic Current (NAC), westward as the Irminger Current (IC), and clockwise around Iceland as the North Icelandic Irminger Current (NIIC). Blue arrows correspond to relatively cool and fresh Arctic waters transported southward by the East Greenland Current (EGC) that diverts north of Iceland as the East Iceland Current (EIC) and southwest of Greenland as the Labrador Current (LC). The subpolar gyre (SPG) flows anticlockwise in the subpolar North Atlantic. The dashed blue line represents the mean position of the North Atlantic Polar Front (PF). The red star indicates the location of the bivalve shell sampling site (80 m water depth). The coloured circles represent the locations of the paleoenvironmental reconstructions represented on Fig. 4: a, f correspond to reconstructions from North Iceland, b–d, j to records from the Norwegian margin, e, i to the subpolar region and h to the Northeast Atlantic. The colour map represents April sea surface temperatures during 2016, obtained from the ESA Climate Change Initiative data64. The land image was obtained from the NOAA National Oceanographic Data Center65.
