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

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.