Carbonate Chemistry and δ18O-H2O from East and West Greenland fjords, August 2018 and 2016

• Main Authors: Henson, Henry, Holding, Johnna, Meire, Lorenz, Rysgaard, Søren, Stedmon, Colin, Stuart-Lee, Alice, Bendtsen, Jørgen, Sejr, Mikael
• Format: Dataset
• Language: unknown
• Published: 2022
• Subjects: Ocean Acidification; Biological pump; Arctic; Climate change; Carbonate saturation state; Seawater chemistry; Freshening; Greenland fjord; Carbon dioxide; Greenland; Scripps; Sanna; East Greenland; greenlandic; Ice Sheet; Ocean acidification
• Online Access: https://zenodo.org/record/6759882; https://doi.org/10.5281/zenodo.6759882

Greenland’s fjords and coastal waters are highly productive and sustain important fisheries, but retreating glaciers and increasing meltwater supply are changing fjord circulation and biogeochemistry, which may threaten the future productivity of these unique ecosystems. The freshening of Greenland fjords caused by unprecedented melting of the Greenland Ice Sheet has the potential to alter carbonate chemistry in coastal waters, which would influence CO2 uptake as well as have biological consequences from acidification. However, few studies to date explore the current acidification state in Greenland coastal waters. Here we present the first-ever large-scale measurements of carbonate system parameters and δ18O measurements in 16 Greenlandic fjords and by combining datasets from two August cruises. HDMS Lauge Koch and RV Sanna cruises sampled on the East and West coast of Greenland in August 2018 and 2016 respectively. This dataset consists of 52 carbonate chemistry sample sites where dissolved inorganic carbon (DIC), total alkalinity (TA), and δ18O-H2O were measured throughout the water column. Water samples were collected in Niskin bottles and were transferred directly into triplicate 12 ml exetainers with a gas tight Tygon tubes, allowing overflow of at least 3 times the volume of the exetainer. Triplicate exetainers were collected for both DIC and TA at each depth. Samples were preserved with HgCl2 (saturated solution) to a final concentration of 0.02%. TA was measured on an Apollo SciTech AS-ALK2 total alkalinity titrator based on the Gran titration procedure for samples in West Greenland. While samples for East Greenland were measured on automatic titrator (Metrohm 888 Titrando), and a combined Metrohm glass electrode (Unitrode). DIC samples were analyzed on Apollo SciTech's AS-C3 analyzer for both cruises, using a sample volume of 0.5 ml. Routine analysis of Certified Reference Materials (provided by A. G. Dickson, Scripps Institution of Oceanography) verified that the accuracy of DIC and TA measurements. ...