Long-term Monitoring of pH, total alkalinity, the stable oxygen isotopic composition of water and the stable carbon isotopic composition of dissolved inorganic carbon in the Canadian Arctic

• Main Author: Mucci, Alfonso
• Format: Dataset
• Language: English
• Published: Canadian Cryospheric Information Network 2017
• Subjects: Air-water exchange; Alkalinity; Amundsen Gulf; Baffin Bay; Beaufort Sea; Canadian Arctic Archipelago; Carbon dioxide; Dissolved inorganic carbon DIC; Lancaster Sound; Mackenzie Shelf; Northwest Passage; Ocean acidification; Oceanic water masses; Oxygen isotopes; pH; Water chemistry; ArcticNet Network of Centres of Excellence of Canada; International Polar Year-Multi-tracer investigation of the effect of climate change on nutrient and carbon cycles in the Arctic ocean; International Polar Year-The Circumpolar Flaw Lead System Study; Arctic; Arctic Ocean; Canada; Pacific; Arctic Archipelago; ArcticNet; Baffin; Climate change; glacier*; International Polar Year; North Atlantic; Northwest passage; Sea ice
• Online Access: https://dx.doi.org/10.5884/12733; https://www.polardata.ca/pdcsearch/?doi_id=12733

pH was measured onboard by spectrophotometric determinations using phenol red and m-cresol purple at 25°C. TA (Titration alkalinity) was measured onboard, by automatic potentiometric titration with a weak HCl solution. d18O(H2O) was stored in screw cap plastic test tubes. Analyzed on a Micromass Isoprime™ universal triple collector mass spectrometer in dual inlet mode with an AquaPrep™ system at the GEOTOP-UQAM stable isotope laboratory. stable carbon isotopic composition of dissolved inorganic carbon (d13C(DIC)) was stored in 60 mL amber glass bottles and poisoned with HgCl2 crystals. Analyzed on a Micromass Isoprime continuous flow isotope ratio mass spectrometer equipped with a MultiFlow (Isoprime) automated injection system at the GEOTOP-UQAM stable isotope laboratory. : Purpose: These data are used to calculate the surface mixed layer pCO2 and aragonite saturation state throughout the water column as well as identify the spatial and temporal variability of these parameters in relation to climate change, sea-ice cover and increasing atmospheric carbon dioxide concentrations (ocean acidification). The data also serve to identify the various source-water masses that make up the water column in the study area and their respective properties. In order to elucidate the role of physical mixing of various source waters, the stable oxygen isotope composition, d18O(H2O), of water is combined to other conservative (e.g., S, T, TA) and non-conservative tracers (e.g., O2, nutrients) to quantify the relative contribution of freshwater inputs (river, sea-ice melt, snow and glacier melt) and oceanic water masses (Polar Mixed Layer, Pacific, Atlantic) to the vertical structure of the water column and the transfer of heat, salt and carbon between the North Pacific and North Atlantic through the Canadian Arctic Archipelago. : Summary: Not Applicable