Temporal variability in surface water pCO2 in Adventfjorden (West Spitsbergen) with emphasis on physical and biogeochemical drivers

• Published in: Journal of Geophysical Research: Oceans
• Main Authors: Ericson, Ylva, Falck, Eva, Chierici, Melissa, Fransson, Agneta, Kristiansen, Svein, Platt, Stephen Matthew, Hermansen, Ove, Myhre, Cathrine Lund
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Geophysical Union 2018
• Subjects: VDP::Matematikk og Naturvitenskap: 400::Geofag: 450; VDP::Mathematics and natural science: 400::Geosciences: 450; air‐sea CO 2 exchange; surface water pCO 2; Svalbard; Arctic fjord; Arctic; Adventfjorden; Spitsbergen
• Online Access: https://hdl.handle.net/10037/13623; https://doi.org/10.1029/2018JC014073

An edited version of this paper was published by AGU. Copyright (2018) American Geophysical Union. Ericson, Y., Falck, E., Chierici, M., Fransson, A., Kristiansen, S., Platt, S.M., . Myhre, C.L. (2018). Temporal variability in surface water p CO 2 in Adventfjorden (West Spitsbergen) with emphasis on physical and biogeochemical drivers. Journal of Geophysical Research - Oceans , 123, 4888-4905. https://doi.org/10.1029/2018JC014073. To view the published open abstract, go to https://doi.org/10.1029/2018JC014073 . Seasonal and interannual variability in surface water partial pressure of CO 2 ( p CO2) and air‐sea CO 2 fluxes from a West Spitsbergen fjord (IsA Station, Adventfjorden) are presented, and the associated driving forces are evaluated. Marine CO 2 system data together with temperature, salinity, and nutrients, were collected at the IsA Station between March 2015 and June 2017. The surface waters were undersaturated in p CO 2 with respect to atmospheric p CO 2 all year round. The effects of biological activity (primary production/respiration) followed by thermal forcing on pCO2 were the most important drivers on a seasonal scale. The ocean was a sink for atmospheric CO 2 with annual air‐sea CO 2 fluxes of −36 ± 2 and −31 ± 2 g C·m −2 ·year−1 for 2015–2016 and 2016–2017, respectively, as estimated from the month of April. Waters of an Arctic origin dominated in 2015 and were replaced in 2016 by waters of a transformed Atlantic source. The CO 2 uptake rates over the period of Arctic origin waters were significantly higher (2 mmol C·m −2 ·day −1 ) than the rates of the Atlantic origin waters of the following year.