Radon loss across the water-air interface (Gulf of Thailand) estimated experimentally from 222Rn-224Ra

Details Radon loss across the water-air interface (Gulf of Thailand) estimated experimentally from 222Rn-224Ra Radon loss across the water-air interface (Gulf of Thailand) estimated experimentally from 222Rn-224Ra

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3305606d&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 5, CiteID L05606

Mathematics

Logic

4

Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Oceanography: Biological And Chemical: Radioactivity And Radioisotopes, Oceanography: Biological And Chemical: Gases, Oceanography: Biological And Chemical: Geochemistry

Scientific paper

We used 222Rn and 224Ra measured in the Upper Gulf of Thailand to estimate 222Rn atmospheric evasion across the water-air interface. The Chao Phraya estuary represents a steady-state source of these tracers and we looked at their horizontal distribution on a transect leading away from the estuary into the Gulf. The isotopes 222Rn and 224Ra have very similar half-lives and are affected in the same manner by mixing processes but only radon will emanate to the atmosphere. We thus are able to estimate the radon air-water exchange rate from the difference in the slopes of the 222Rn and 224Ra horizontal distributions. Estimated gas exchange velocities (k) based on our results were 1.1 cm hr-1 in the dry season (January 2004) and 2.1 cm hr-1 during the wet season (July 2004). These rates agreed reasonably well with some theoretical models developed for lakes, estuaries and coastal systems.

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