Dissolved and particulate silica concentrations and natural silicon isotope compositions of dissolved silica measured from seawater samples collected aboard the Sir Wilfrid Laurier in the Bering and Chukchi Seas and the Amundsen in the Canada Basin, Canadian Arctic Archipelago, Baffin Bay and Labrador Sea

Samples were collected on three cruises: onboard the Canadian Coast Guard Service (CCGS) Sir Wilfrid Laurier (one cruise covering the Bering and Chukchi Seas, Jul 2015), or the CCGS Amundsen (two cruises covering the Canada Basin, Canadian Arctic Archipelago, Baffin Bay and Labrador Sea, Jul-Aug 2015 and Sep 2015).

On the CCGS Sir Wilfrid Laurier, seawater sampling was conducted throughout the euphotic zone within (or near) four biological ‘hotspots’ in the northern Bering and Chukchi Seas, as identified by the Distributed Biological Observatory (DBO). On the CCGS Amundsen, seawater sampling was conducted throughout the water column at locations identified as part of the Canadian Arctic GEOTRACES program. Data includes: seawater temperature and salinity, silicic acid, biogenic silica, and lithogenic silica concentrations, and the natural silicon isotopic composition of silicic acid.