Sediment trap fluxes and sea-ice dynamics measured at the mooring station HG-IV from 2000 to 2013. Panel (a) shows sediment trap mooring fluxes of terrigenous marker (orange bars) and Phaeocystis OTUs (green squares). Panel (b) shows the average distance of the sea-ice edge (defined as ≥15% sea-ice cover) to the mooring location. Panels (c) and (d), respectively, show POC flux and sequence abundance of Phaeocystis OTUs at HG-IV, grouped according to the distance of the sea-ice edge at the time of individual flux measurements. Panel (e) shows fluxes of POC against terrigenous marker collected at HG-IV (linear regression, gray area shows the 95% confidence interval). No sediment trap was deployed at HG-IV between July 2003 and June 2004 which led to the missing flux measurements in panels (a) and (b) (see Table S1 for details). Due to irregular sampling frequency, the sampling months are stated in panel (a). For panels (c to e) only flux values during the productive season from March to September were used.