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

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.