Secular changes in the solar semidiurnal tide of the western North Atlantic Ocean

Details Secular changes in the solar semidiurnal tide of the western North Atlantic Ocean Secular changes in the solar semidiurnal tide of the western North Atlantic Ocean

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3619601r&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 19, CiteID L19601

Physics

5

Oceanography: Physical: Surface Waves And Tides (1222), Oceanography: Physical: Decadal Ocean Variability (1616, 1635, 3305, 4215), Geographic Location: Atlantic Ocean

Scientific paper

An analysis of twentieth century tide gauge records reveals that the solar semidiurnal tide S2 has been decreasing in amplitude along the eastern coast of North America and at the mid-ocean site Bermuda. In relative terms the observed rates are unusually large, of order 10% per century. Periods of greatest change, however, are inconsistent among the stations, and roughly half the stations show increasing amplitude since the late 1990s. Excepting the Gulf of Maine, lunar tides are either static or slightly increasing in amplitude; a few stations show decreases. Large changes in solar, but not lunar, tides suggest causes related to variable radiational forcing, but the hypothesis is at present unproven.

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