Fig. 2: Hydrography of the North Atlantic and Mediterranean Sea.

a Temperatures at 800 m water depth in the North Atlantic. Denoted are sites referenced in the text as well as the major flow paths of the Levantine Intermediate Water (LIW), Western Mediterranean Deep Water (WMDW) and the Mediterranean Outflow Water (MOW)65. Hydrographic section displayed in (b) is indicated by a black line. b Meridional hydrographic section through Sites U1313 and 982 with temperatures (shading) and isopycnals (kg m−3; contours). The MOW is indicated by a positive temperature anomaly in the deep thermocline at approximately 400–1000 m water depth, decreasing upper ocean stratification. The present-day northward trajectory of isopycnal heat transport is indicated by a white dashed arrow.