We calculated an average net CO 2 flux of about −5 mmol CO 2 m −2 day −1 (−3.3 Tg C into the ocean) during the spring and early summer seasons and about −7.2 Tg C during the open water season. We observed spatially limited pCO 2 supersaturation near river mouths and beneath sea ice. In this study, the first spring and early summer measurements of pCO 2 and estimates of air–sea CO 2 fluxes in Hudson Bay and Hudson Strait showed that the area was mainly a sink for atmospheric CO 2, as a result of the dominance of sea-ice meltwater. In fact, Hudson Bay has not been included in many global and Arctic-specific carbon budgets, which is a significant gap considering that the total area of this region (including Hudson strait) is about 16% of the total Arctic shelf area. However, there have been few studies of air–sea CO 2 exchange in Hudson Bay, especially during the sea ice melt season. Abstract: Hudson Bay is a subarctic/Arctic continental shelf sea that receives nearly one-third of Canada’s river discharge and transitions from complete ice cover in winter to open water in summer.

Instal Ice Age: Continental Drift free