Fig. 1From: Paleoceanography of the northwestern Pacific across the Early–Middle Pleistocene boundary (Marine Isotope Stages 20–18)The current system in the western North Pacific and latitudinal water properties, showing a regional current systems (Qiu 2001) and the location of the Chiba composite section (CbCS) b the two North Pacific gyres based on Qiu (2001) and core site locations. Latitudinal c temperature (Locarnini et al. 2013), d salinity (Zweng et al. 2013) profiles in the Kuroshio and Kuroshio–Oyashio mixed zone obtained from the red line in panel aBack to article page