The CTD data was obtained during the 2009 ArcticNet scientific cruise #0902a with the participation of Imperial Oil Ltd. (IOL). The data were collected from July 18 to 27, 2009, aboard the CCGS Amundsen. There were 24 casts associated to 22 stations, located in the Ajurak Block prospection site. The following parameters were measured: temperature, conductivity and pressure (with a Sea-Bird SBE-9plus), dissolved oxygen (Sea-Bird SBE-43), pH (Sea-Bird SBE-18-I), fluorescence (Seapoint chlorophyll fluorometer), nitrate concentration (Satlantic MBARI-ISUS 5T), transmittance (Wetlabs C-Star transmissometer), currents (RDI LADCP), turbidity (UVP 5), light intensity (PAR; Biospherical Instruments QCP2300) and surface light intensity (sPAR; Biospherical Instruments QCP2200). Quality control procedures were applied to the data. Data are available on the Polar Data Catalogue and at the Marine Environmental Data Service (MEDS) of Fisheries and Oceans Canada.

Two remotely operated vehicle (ROV) video surveys were conducted at the SW Greenland location, at depths of ~700-950 m in August 2018. The primary purpose of the ROV dives at this location was to video survey the area study the distribution, geology, and species associations to the reef-forming cold-water coral Lophelia pertusa. Another objective of these dives was to survey the area to identify a suitable location for piston coring. Lophelia pertusa coral colonies were observed on steep bedrock surfaces between 950 and 750 m water depth. Other corals observed at this site include Primnoa resedaeformis, Paragorgia arborea, soft corals, and sponges Asconema spp, Geodia spp., among others. No sampling took place at this location due to ROV issues.

Sample collections were made aboard the CCGS Amundsen during the ArcticNet field campaigns in August 2013 (Leg 1), July, August and October 2014 (Leg 1 & 3) and October 2015 (Leg 4). Sediment samples retrieved from box cores were sliced into 0.5 cm increments and frozen separately, while benthic invertebrates were collected using a benthic trawl. Individual species including Gorgoncephelus arcticus, Psilaster andromeda, Ophiopleura borealis and Ctenodiscus crispatus were identified, sorted, packed and stored at -30C and shipped to Winnipeg. At the University of Manitoba samples were freeze-dried and homogenized. Samples were then extracted and analyzed for polycyclic aromatic hydrocarbons (PAHs) and n-alkanes using a LECO Pegasus gas chromatographer with a high resolution time of flight mass spectrometer (GC-HR TOFMS). Supplementary data was also generated, including stable isotope ratios of nitrogen and carbon, as well as lipid (inverts) and total organic carbon (sediment) to calculate biota-sediment accumulation factors (BSAFs). Statistical analysis is currently ongoing.

The CTD data was obtained during the 2009 Malina scientific cruise #0902 as part of the ArcticNet program. The data were collected from July 31 to August 24, 2009, aboard the CCGS Amundsen. There were 167 casts associated to 52 stations, located in the Beaufort Sea research area. The following parameters were measured: temperature, conductivity and pressure (with a Sea-Bird SBE-9plus), dissolved oxygen (Sea-Bird SBE-43), fluorescence (Seapoint chlorophyll fluorometer), CDOM (Haardt backscat fluorometer FL(RT)D), nitrate concentration (Satlantic MBARI-ISUS 5T), transmittance (Wetlabs C-Star transmissometer), currents (RDI LADCP), turbidity (UVP 5), light intensity (PAR; Biospherical Instruments QCP2300) and surface light intensity (sPAR; Biospherical Instruments QCP2200). Quality control procedures were applied to the data. Data are available on the Polar Data Catalogue and at the Marine Environmental Data Service (MEDS) of Fisheries and Oceans Canada.

A remotely operated vehicle (ROV) video survey was conducted at the Saglek Bank location, at a depth of ~550 m in July 2018. The primary purpose of this ROV dive was to verify whether the location was suitable for the deployment of a lander (ATLAS project). Another objective was the geological and biological site characterization across depths, and sampling of dead coral skeletons, live corals for stable isotopes and lipids, and sponges for stable isotopes. The location was considered suitable for the deployment of a lander (i.e. rocks scarce on the bottom), but problems with the ROV refrained sample collection.

The CTD data was obtained during the 2009 Geotraces scientific cruise #0903 as part of the ArcticNet program. The data were collected from August 30 to September 10, 2009, aboard the CCGS Amundsen. There were 45 casts associated to 8 stations, located in the Beaufort Sea area. The following parameters were measured: temperature, conductivity and pressure (with a Sea-Bird SBE-9plus), dissolved oxygen (Sea-Bird SBE-43), fluorescence (Seapoint chlorophyll fluorometer), CDOM (Haardt backscat fluorometer FL(RT)D), nitrate concentration (Satlantic MBARI-ISUS 5T), transmittance (Wetlabs C-Star transmissometer), currents (RDI LADCP), turbidity (UVP 5), light intensity (PAR; Biospherical Instruments QCP2300) and surface light intensity (sPAR; Biospherical Instruments QCP2200). Quality control procedures were applied to the data. Data are available on the Polar Data Catalogue and at the Marine Environmental Data Service (MEDS) of Fisheries and Oceans Canada.

Ocean Mapping Group acoustic data generated from the 2004 multibeam sonar survey on the 2004 CCGS Amundsen ArcticNet Cruise. The data include high-resolution bathymetry and acoustic backscatter imagery collected 24 hours a day, whenever the ship was in transit or had dedicated survey time.

Zooplankton samples were collected onboard the research Icebreaker CCGS Amundsen during Leg 1 in 2005 (4 stations) and Leg 1 in 2006 (8 stations) with a vertically towed net frame equipped with a set of 4 adjacent 1-m2 nets (mesh size 200 µm and 500 µm) from near the bottom to the surface and by trawling an oblique rectangular mid-water trawl (mesh size 1600 µm) or an oblique Tucker net (mesh size 2x500 µm) in the surface layer from 100 m depth to the surface. Samples were placed into 30 ml plastic vials and/or whirl-pak bags and were kept frozen at -20 degree Celsius. Representative sub-samples of individual zooplankton genera were placed in 4 ml glass vials for stable isotope analysis. Three keystone zooplankton genus were included in this study: Calanus spp. (mostly adult Calanus hyperboreus), Themisto spp. (mostly adult Themisto libellula) and Euchaeta spp. THg analysis was conducted at the Freshwater Institute with cold vapour atomic absorption spectroscopy (CVAAS). MMHg analysis was conducted at the University of Ottawa by Gas Chromatography Atomic Fluorescence Spectroscopy (GCAFS). Carbon and nitrogen isotopic analyses were performed at the University of Winnipeg Isotope Laboratory by continuous flow ion ratio mass spectrometry (CF-IRMS). Oceanographic data (Hg levels in water column, salinity, 18O) were collected by our team. Water samples were collected with 24 12-L Niskin bottles attached to a rosette sampler equipped with Seabird 911+ CTD (Sea-Bird Electronics, Inc.).

The CTD data was obtained during the 2011 ArcticNet scientific cruise #1102c with the participation of the British Petroleum (BP) company. The data were collected from September 9 to 19, 2011, aboard the CCGS Amundsen. There were 21 casts associated to 18 stations, located in the Beaufort Sea. The following parameters were measured: temperature, conductivity and pressure (with a Sea-Bird SBE-9plus), dissolved oxygen (Sea-Bird SBE-43), fluorescence (Seapoint chlorophyll fluorometer), CDOM (Wetlabs FL(RT)D), nitrate concentration (Satlantic MBARI-ISUS 5T), transmittance (Wetlabs C-Star transmissometer), light intensity (PAR; LI-COR Biosciences) and surface light intensity (sPAR; LI-COR Biosciences). Quality control procedures were applied to the data. Data are available on the Polar Data Catalogue and at the Marine Environmental Data Service (MEDS) of Fisheries and Oceans Canada.

Ocean Mapping Group acoustic data generated from the 2008 multibeam sonar survey on the 2008 CCGS Amundsen ArcticNet Cruise. The data include high-resolution bathymetry and acoustic backscatter imagery collected 24 hours a day, whenever the ship was in transit or had dedicated survey time.