Environmental turbulent mixing controls on air-water gas exchange in marine and aquatic systems

Publication Type  Journal Article
Year of Publication  2007
Authors  Zappa, C. J.; McGillis, W. R.; Raymond, P. A.; Edson, J. B.; Hintsa, E. J.; Zemmelink, H. J.; Dacey, J. W. H.; Ho, D. T.
Journal Title  Geophysical Research Letters
Volume  34
Issue  10
Pages  -
Journal Date  May 17
ISBN Number  0094-8276
Accession Number  ISI:000246838200001
Key Words  surface turbulence; transfer velocity; european estuaries; breaking waves; mass-transfer; hudson river; wind-waves; sea; co2; carbon
Abstract  

Air-water gas transfer influences CO2 and other climatically important trace gas fluxes on regional and global scales, yet the magnitude of the transfer is not well known. Widely used models of gas exchange rates are based on empirical relationships linked to wind speed, even though physical processes other than wind are known to play important roles. Here the first field investigations are described supporting a new mechanistic model based on surface water turbulence that predicts gas exchange for a range of aquatic and marine processes. Findings indicate that the gas transfer rate varies linearly with the turbulent dissipation rate to the 1/4 power in a range of systems with different types of forcing - in the coastal ocean, in a macro-tidal river estuary, in a large tidal freshwater river, and in a model (i.e., artificial) ocean. These results have important implications for understanding carbon cycling.

Notes  

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URL  <Go to ISI>://000246838200001
DOI  Doi 10.1029/2006gl028790