Impact of sea ice on air-sea CO2 exchange – A critical review of polar eddy covariance studies

Watts, J, Bell, TG, Anderson, K, Butterworth, BJ, Miller, S, Else, BGT and Shutler, J 2022 Impact of sea ice on air-sea CO2 exchange – A critical review of polar eddy covariance studies. Progress in Oceanography, 201. 102741.

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Sparse in situ measurements and poor understanding of the impact of sea ice on air-sea gas exchange introduce large uncertainties to models of polar oceanic carbon uptake. The eddy covariance technique can be used to produce insightful air-sea gas exchange datasets in the presence of sea ice, but results differ between studies. We present a critical review of historical polar eddy covariance studies and can identify only five that present comparable flux datasets. Assessment of ancillary datasets, including sea-ice coverage and type and air-sea concentration gradient of carbon dioxide, used to interpret flux datasets (with a specific focus on their role in estimating and interpreting sea ice zone gas transfer velocities) identifies that standardised methodologies to characterise the flux footprint would be beneficial. In heterogeneous ice environments both ancillary data un�certainties and controls on gas exchange are notably complex. To address the poor understanding, we highlight how future efforts should focus on the collection of robust gas flux datasets within heterogeneous sea ice regions during key seasonal processes alongside consistent ancillary data with a full characterisation of their associated uncertainties.

Item Type: Publication - Article
Additional Keywords: Air-sea gas exchange Gas transfer velocity Air-sea carbon-dioxide fluxes Eddy covariance Remote sensing Sea ice
Divisions: Plymouth Marine Laboratory > National Capability categories > Long-term Multi-Centre ORCHESTRA
Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User: S Hawkins
Date made live: 11 Mar 2022 10:24
Last Modified: 11 Mar 2022 10:24

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