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  1. Free, publicly-accessible full text available December 1, 2024
  2. Abstract

    Less than three decades ago only a small fraction of the Arctic Ocean (AO) was ice free and then only for short periods. The ice cover kept sea surfacepCO2at levels lower relative to other ocean basins that have been exposed year round to ever increasing atmospheric levels. In this study, we evaluate sea surfacepCO2measurements collected over a 6‐year period along a fixed cruise track in the Canada Basin. The measurements show that meanpCO2levels are significantly higher during low ice years. ThepCO2increase is likely driven by ocean surface heating and uptake of atmospheric CO2with large interannual variability in the contributions of these processes. These findings suggest that increased ice‐free periods will further increase sea surfacepCO2, reducing the Canada Basin's current role as a net sink of atmospheric CO2.

     
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