Monitoring of the carbonate chemistry at the AWIPEV underwater observatory

The AWIPEV-CO2 project aims to establish time-series measurements of the carbonate chemistry at Ny-Ålesund. It would be the first time-series of this kind in the coastal Arctic. These data are needed to estimate the rate at which the coastal Arctic acidifies and to plan new perturbation experiments following the first ones carried out as part of AWIPEV in 2009 and 2010. It is proposed to add two instruments to the already existing AWIPEV Underwater Observatory to measure the partial pressure of CO2 (continuously) as well as total alkalinity (once a day). Additionally, discrete sea water samples will be collected weekly for measurement of dissolved inorganic carbon and total alkalinity. This will be used to calibrate and validate the sensor data.