Stochastic Modeling of Short Term Variations of Sea Level in Eastern Canada |
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Authors: | Karim Hilmi Mohammed I El-Sabh Jean-Pierre Chanut Tad Murty |
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Institution: | 1. Earth Sciences and Hydrology Division, Marine and Earth Sciences Group, Remote Sensing Applications and Image Processing Area , Space Applications Centre (ISRO) , Ahmedabad , India;2. Geological Oceanography Division , National Institute of Oceanography , Goa , India |
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Abstract: | Hourly sea level records from three stations in eastern Canada (Québec-Lauzon, Harrington-Harbour and Halifax) are analyzed both in frequency domain from 1970 to 1979 and in time domain during 1973. At the three stations, the deterministic model explains 90 to 96% of the total variability of sea level. The semidiurnal and diurnal tides contribute largely to its variations. The residual series, less than 10% of the initial variations of sea level, contain irregular values including extreme values of seiches and storm surges. Such random variations are analyzed and modeled following the method described by Box and Jenkins (1976). The long period variations (2 to 30 days) can be attributed to meteorological forcing (atmospheric pressure and winds). The short period variations (some hours to one day) can be attributed to longitudinal seiches, semidiurnal and diurnal atmospheric tides, and inertial oscillations. The water discharge from the St. Lawrence River contributes 29% of the monthly residual sea level at Qué |
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Keywords: | East Coast Of Canada Hydrology Meteorology Sarima Models Sea Level Short Term Variations |
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