On the Discrepancies between CO2 Flux Measurement Methods
conference paper
In 1993 the ASGASEX (for Air-Sea GAS Exchange) experiment took place at Meetpost Noordwijk, a research platform off the Dutch coast. One of the aims of the project was to try to find an explanation for the order of magnitude difference between transfer velocities for CO2, measured with the eddy correlation technique, and those from other methods. After ascertaining the quality of our eddy correlation CO2 flux data, we noted that the order of magnitude difference for the transfer velocity was again present. This drew our attention to the CO2-fugacity, which showed large tide-related excursions. Indicating fugacity gradients. Based on the contrast between the regularity of the fluxes and the more fluctuating character of the fugacities we make an argument that the gradients may be connected to a shallow pycnocline, in agreement with the results of earlier hydrographlcal work done in the area. This conceptual model can largely explain the transfer velocity discrepancy. It is stressed that, despite this agreement, the model is still hypothetical, that there are problems remaining and that confirmation is needed. This will be attempted as part of the ASGASEX MACE (for Marine Aerosol and Gas Exchange, a subgroup of ICAC) experiment ASGAMAGE, to take place in 1996.
TNO Identifier
94845
Publisher
AEON Verlag & Studio
Source title
Air-Water Gas Transfer - Selected papers from the Third International Symposium, July 24-27, 1995, Heidelberg University
Editor(s)
Jähne, B.
Monahan, E.C.
Monahan, E.C.
Place of publication
Hanau
Pages
723-733
Files
To receive the publication files, please send an e-mail request to TNO Repository.