Abstract
This paper describes an investigation of unusual large-amplitude highfrequency sea level events (∼40–60cm) observed during the period 2006–2012 along the central U.S. East Coast. These events occurred 2–3h after offshore propagating atmospheric pressure disturbances crossed the coastline. The large amplitudes of the oscillations may be explained by Proudman resonance, as the average speed of the atmospheric pressure disturbances, estimated to be between 16 and 25m/s, was similar to the shallow-water wave speed over the shelf, ∼15–20m/s. The observed lag of 2–3h of the events can be explained by shoreward-propagating free waves generated as the atmospheric-forced waves crossed the shelf edge. The estimated pathways of the forced and reflected free ocean waves seem to have been coherent and in good agreement with the lag observed at tide gauge stations.
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