“…Possible mechanisms responsible for iron delivery to GoA surface waters between 54 and 17 ka might have been: (a) meltwater discharge from the northern CIS (Addison et al., 2012; Cowan et al., 2020), (b) seasonal mixing of the uppermost water column (Crusius et al., 2011), (c) aeolian input, and (d) eddy‐mediated offshore transport of coastal waters (Crusius et al., 2017). Although these mechanisms might have impacted primary productivity in different ways throughout the studied interval, we assign a major role of surface water fertilization to iron delivery via iceberg and meltwater discharges from tidewater termini (Cowan et al., 2020; Crusius et al., 2017). Site U1419 was drilled on the Alaskan continental shelf, approximately 75 km west of the Bering Trough mouth (Jaeger, Gulick, & LeVay, 2014).…”