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Evolution of tidal amplitudes in the eastern Pacific Ocean
Author(s) -
Jay David A.
Publication year - 2009
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 - 10.1029/2008gl036185
Subject(s) - oceanography , amplitude , pacific ocean , environmental science , geology , physics , quantum mechanics
Global sea level (GSL) rise is well documented. However, changes in high waters, including the tidal contribution, are sometimes more relevant than GSL rise. Analysis of 34 long tidal records from the Eastern Pacific Ocean shows that K 1 and M 2 amplitudes (∣K 1 ∣ and ∣M 2 ∣) are increasing, except for ∣M 2 ∣ in the Gulf of Panama. North of 18°N, ∣K 1 ∣ and ∣M 2 ∣ are both growing at 2.2% century −1 . The mean increase in total tidal amplitude (0.59 mmyr −1 ) is less than the present GSL rise (1.7 mmyr −1 ). However, mean sea level is nearly constant in the NE Pacific, so tidal evolution plays a major regional role in changes in high water levels. The spatial pattern of tidal evolution suggests the influence of large‐scale processes, and the similarity in spatial patterns for ∣K 1 ∣ and ∣M 2 ∣ excludes mechanisms with strong frequency dependence. Increasing tidal amplitudes may impact ocean mixing, nutrient supply, primary production, fisheries, and coastal erosion.