El Niño-Southern Oscillation determines the salinity of the freshwater lens under a coral atoll in the Pacific Ocean

Details El Niño-Southern Oscillation determines the salinity of the freshwater lens under a coral atoll in the Pacific Ocean El Niño-Southern Oscillation determines the salinity of the freshwater lens under a coral atoll in the Pacific Ocean

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3321403v&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 21, CiteID L21403

Mathematics

Logic

5

Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Hydrology: Groundwater Quality, Oceanography: Physical: Enso (4922)

Scientific paper

The freshwater resources of coral atolls occur mainly as lenses floating on salt water underneath the islands. The size and shape of these lenses are determined by hydrogeologic characteristics, the rainfall recharge rate and its temporal variation, plus extractions (Underwood et al., 1992; Jones and Banner, 2003; Jocson et al., 2002). In the South Pacific, rainfall exhibits seasonal as well as interannual variability related to the El Niño-Southern Oscillation (ENSO) (Ropelewski and Halpert, 1987). We used electric conductivity measurements from pumped wells on Tongatapu to show a moderate ENSO control on the temporal fluctuation of the pumped freshwater salinity. The salinity dynamics depended on low or increased rainfall recharge during respectively dry El Niño periods or wet La Niña events. ENSO events cause a large variation around the mean salinity and determine the relative salinity over the time-scale of several years, while a smaller variation is introduced by seasonal rainfall. The Southern Oscillation Index (SOI) (Troup, 1965; Stone et al., 1996) was used to predict freshwater salinity with a lag time of 10 months.

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