In order to budget properly the air–sea exchange of gases in Arctic environments we require an understanding of how gas transfers through: (1) open water, (2) sea ice in its various thermodynamic states; and (3) mixed or marginal sea-ice environments. Although all three of these regimes are currently understudied, the issue of gas transfer through mixed ice regimes (defined as a mixture of sea ice and open water in varying proportions) is probably the least studied due to the logistical difficulties of operating in such an icescape. This is unfortunate, because it is during these periods that gas exchange is likely to be very interesting; for example, high biological productivity during spring break-up can drive strong uptake of CO₂, and convective upwelling during fall freeze up may cause a significant release of CO₂. During the 2007–2008 ArcticNet and Circumpolar Flaw Lead Study (CFL) IPY projects onboard the CCGS Amundsen a micrometeorological tower was deployed to measure directly fluxes of CO₂, H₂O, heat and momentum using eddy covariance techniques. Given the wide range of conditions that the Amundsen encountered during the 336 day deployment of the instruments, this dataset will no doubt shed light on all three gas transfer regimes. In this presentation, preliminary data products are used to examine potential relationships between gas exchange and the sea-ice system. We highlight the potential of this dataset to derive parameterizations for estimating fluxes in these largely understudied sea-ice regimes.