Tidal pumping of groundwater into the coastal ocean revealed from submarine 222Rn and CH4 monitoring

Details Tidal pumping of groundwater into the coastal ocean revealed from submarine 222Rn and CH4 monitoring Tidal pumping of groundwater into the coastal ocean revealed from submarine 222Rn and CH4 monitoring

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n..23k&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 14, pp. 23-1, CiteID 1678, DOI 10.1029/2002GL015093

Mathematics

Logic

13

Oceanography: Biological And Chemical: Chemical Tracers, Oceanography: Biological And Chemical: Radioactivity And Radioisotopes, Oceanography: Biological And Chemical: Biogeochemical Cycles (1615), Hydrology: Groundwater Transport, Hydrology: Groundwater Hydrology

Scientific paper

There has emerged a recognition that the submarine discharge of fresh, brackish, and marine groundwaters into the coastal ocean is comparable to the inputs via river discharge. However, the factors controlling submarine groundwater discharge (SGD) are poorly understood owing to a lack of SGD measurement tools in dynamic coastal waters. We observed bi-hourly variations of the natural SGD tracers, 222Rn and CH4, at a coastal seawater station over two seasons using novel monitoring techniques. This unique data set suggests that SGD increases sharply from neap to spring tide during the wet season. The observed increase is much greater than what would be expected from the rainfall and tidal-height changes. We conclude from this that the temporal variation of SGD is regulated predominantly by a semi-monthly fluctuation of a tidal oscillating pumping force in this environment.

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