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Interaction between atmospheric processes and marine emissions of carbon

Senior scientist Lise Lotte Sørensen is measuring the partial pressure of CO2 in the surface water close to the coast using a small membrane equilibrator
The instruments for measuring air – sea exchange of CO2 are installed in a 7 meter tower at the coast in the bottom of Kobbefjord. The instruments are powered by a small wind turbine and solar panels.

We have just ended our third Kobbefjord experiment. We have now measured air-sea and air-sea ice exchange of CO2 over the inner part of the fjord in three seasons (winter, spring and fall) in February, May and September using the micrometeorological techniques; eddy covariance and power spectra analysis. Furthermore we have measured the partial pressure of CO2 (pCO2) in the water using different methods, but the direct measurements are based on an equilibrator technique and IR absorption. The atmospheric and the marine measurements taken during the open water season will be used for estimation of air-sea exchange velocities. These will to our knowledge be the first estimation of exchange velocities in Arctic fjord systems, and they are important for calculation of the uptake of CO2 in the Greenlandic coastal area.

Bjarne Jensen, Aarhus University
Jakob Sievers, Aarhus University
Tim Papakyriakou, University of Manitoba
Lise Lotte Sørensen, Aarhus University

For more information, contact Lise Lotte Sørensen