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Tidal pumping of groundwater into the coastal ocean revealed from submarine 222 Rn and CH 4 monitoring
Author(s) -
Kim Guebuem,
Hwang DongWoon
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl015093
Subject(s) - submarine groundwater discharge , brackish water , seawater , submarine , oceanography , estuary , groundwater , hydrology (agriculture) , environmental science , discharge , geology , groundwater discharge , salinity , aquifer , groundwater flow , geography , drainage basin , geotechnical engineering , cartography
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, 222 Rn and CH 4 , 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.