Estimation of air-water gas exchange coefficient in a shallow lagoon based on 222Rn mass balance

Journal of Environmental Radioactivity
S CockenpotO Radakovitch

Abstract

The radon-222 mass balance is now commonly used to quantify water fluxes due to Submarine Groundwater Discharge (SGD) in coastal areas. One of the main loss terms of this mass balance, the radon evasion to the atmosphere, is based on empirical equations. This term is generally estimated using one among the many empirical equations describing the gas transfer velocity as a function of wind speed that have been proposed in the literature. These equations were, however, mainly obtained from areas of deep water and may be less appropriate for shallow areas. Here, we calculate the radon mass balance for a windy shallow coastal lagoon (mean depth of 6m and surface area of 1.55*10(8) m(2)) and use these data to estimate the radon loss to the atmosphere and the corresponding gas transfer velocity. We present new equations, adapted to our shallow water body, to express the gas transfer velocity as a function of wind speed at 10 m height (wind range from 2 to 12.5 m/s). When compared with those from the literature, these equations fit particularly well with the one of Kremer et al. (2003). Finally, we emphasize that some gas transfer exchange may always occur, even for conditions without wind.

References

Jul 16, 2003·Journal of Environmental Radioactivity·William C Burnett, Henrieta Dulaiova
Jun 8, 2006·Journal of Environmental Radioactivity·P P PovinecM A Schiavo
Jun 30, 2006·The Science of the Total Environment·W C BurnettJ V Turner
Jan 29, 2010·Journal of Environmental Radioactivity·Thomas C StieglitzWilliam C Burnett
Jan 1, 2009·Annual Review of Marine Science·Rik WanninkhofWade R McGillis
Feb 8, 2011·Marine Pollution Bulletin·Ariel C BlancoTakahiro Yamamoto

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Citations

Jul 4, 2019·Environmental Science and Pollution Research International·Yongjun YeKimberlee Jane Kearfott

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