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Changes in extreme high water levels based on a quasi-global tide-gauge data set

By Melisa Menendez and Philip L. Woodworth


A quasi-global sea level data set from tide gauges has been used to investigate extreme sea level events and their spatial and temporal variabilities. Modern methods based on a nonstationary extreme value analysis have been applied to the maxima of the total elevations and surges for the period of 1970 and onward. A subset of the data was used to study changes over the 20th century. The analyses demonstrate the magnitude and timing of the seasonal cycle of extreme sea level occurrence, the magnitude of long-term trends in extreme sea levels, the evidence for perigean and nodal astronomical tidal components in the extremes, and the relationship of the interannual variability in high water levels to other ocean and atmosphere variations as represented by climate indices. The subtraction from the extreme sea levels of the corresponding annual median sea level results in a reduction in the magnitude of trends at most stations, leading to the conclusion that much of the change in the extremes is due to change in the mean value

Topics: Marine Sciences
Publisher: American Geophysical Union
Year: 2010
DOI identifier: 10.1029/2009jc005997
OAI identifier: oai:nora.nerc.ac.uk:13944

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