Fig. 1: Map showing general information about the subarctic North Pacific.

Modern nitrate concentration (μmol/l) of the surface water generated with Ocean Data View65. The star indicates the site of sediment core LV76-16-1. The locations of other sediment cores mentioned in the text (also the Supplementary Fig.) are indicated by solid circles. The base map is generated using Ocean Data View (http://odv.awi.de/).