EGU21-15711
https://doi.org/10.5194/egusphere-egu21-15711
EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Eddy covariance flux measurements of momentum, heat and carbon dioxide in Hudson Bay at the onset of sea ice melt 

Richard Sims, Brian Butterworth, Tim Papakyriakou, Mohamed Ahmed, and Brent Else
Richard Sims et al.
  • University of Calgary, Geography, Canada (richardpeter.sims@ucalgary.ca)

Remoteness and tough conditions have made the Arctic Ocean historically difficult to access; until recently this has resulted in an undersampling of trace gas and gas exchange measurements. The seasonal cycle of sea ice completely transforms the air sea interface and the dynamics of gas exchange. To make estimates of gas exchange in the presence of sea ice, sea ice fraction is frequently used to scale open water gas transfer parametrisations. It remains unclear whether this scaling is appropriate for all sea ice regions. Ship based eddy covariance measurements were made in Hudson Bay during the summer of 2018 from the icebreaker CCGS Amundsen. We will present fluxes of carbon dioxide (CO2), heat and momentum and will show how they change around the Hudson Bay polynya under varying sea ice conditions. We will explore how these fluxes change with wind speed and sea ice fraction. As freshwater stratification was encountered during the cruise, we will compare our measurements with other recent eddy covariance flux measurements made from icebreakers and also will compare our turbulent COfluxes with bulk fluxes calculated using underway and surface bottle pCO2 data. 

 

How to cite: Sims, R., Butterworth, B., Papakyriakou, T., Ahmed, M., and Else, B.: Eddy covariance flux measurements of momentum, heat and carbon dioxide in Hudson Bay at the onset of sea ice melt , EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-15711, https://doi.org/10.5194/egusphere-egu21-15711, 2021.

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