Agneta Fransson

Melissa Chierici

Carbonate chemistry/marine CO2 system (total alkalinity, total dissolved inorganic carbon) were collected during annual MOSJ (Monitoring of Svalbard and Jan Mayen) summer cruises to Rijpfjorden and the adjacent Nansen Basin of the Arctic Ocean with R/V Lance on 16 July–3 August 2012, 26–30 July 2013, and 27–29 July 2014.

Physical measurements and water samples were collected using a ship-board CTD probe attached to a Rosette-sampler with 12 Niskin bottles (SBE911 plus, Sea Bird Electronics, Bellevue, WA, United States). The CTD is calibrated by Sea Bird Electronics annually before each sampling season. Dissolved inorganic carbon (DIC) and total alkalinity (AT) were determined, for carbonate chemistry/CO2 system, during 2012–2014.

Chemical analyses:

Carbonate chemistry parameters were calculated from DIC and total alkalinity (AT) values that were analyzed after the cruises at the Institute of Marine Research (IMR Tromsø,

Norway) following the method described in Dickson et al. (2007). DIC was determined using gas extraction of acidified samples followed by coulometric titration and photometric detection using a Versatile Instrument for the Determination of Titration carbonate (VINDTA 3D, Marianda, Germany). The AT was determined by potentiometric titration with 0.1 N hydrochloric acid using a Versatile Instrument for the Determination of Titration Alkalinity (VINDTA 3S, Marianda, Germany). Routine analyses of Certified Reference Materials (CRM, provided by A. G. Dickson, Scripps Institution of Oceanography, United States) ensured the accuracy of the measurements, which was better than ±1 μmol kg−1 and ±2 μmol kg−1 for DIC and AT, respectively.

References:

Dickson, A. G., Sabine, C. L., and Christian, J. R. (2007). Guide to best practices for ocean CO2 measurements. chap. 4, pp. 23–78, PICES Spec. Publ., 3.

Hop, H., Assmy, P., Wold, A., Sundfjord, A., Daase, M., Duarte, P., Kwasniewski S, Gluchowska M, Wiktor JM, Tatarek A, Wiktor J Jr, Kristiansen S., Fransson, A., Chierici, M., and M. Viktakhari. 2019. Pelagic Ecosystem Characteristics across the Atlantic Water Boundary Current from Rijpfjorden, Svalbard, to the Arctic Ocean During Summer (2010-2014), Frontiers in Marine Science, 6:181, doi: 10.3389/fmars.2019.00181, Carbon Bridge to the Arctic special issue.

Opstad, I., A. Mangor-Jensen, E. Sperfeld., I. Semb Johansen., A. Fransson., M. Chierici and P. Dalpadado., 2018. Effects of high pCO2 on the northern krill Thysanoessa inermis in relation to carbonate chemistry of its collection area, Rijpfjorden. Marine Biology, 165:116, doi: doi.org/10.1007/s00227-018-3370-7

CEOS IDN DIF

9.8.4