| Resumo: |
Tide gauge measurements recorded at two stations in the Red Sea, at Port Sudan from 1986 - 1994 and at Gizan for the period of 1992 - 1994 are used to analyze the sea level changes and tide along the east and west coast of the Red Sea, using the harmonic analysis (t tide). Meteorological parameters during the same period are used to study the response of the sea level and residual sea level to local and global forcing. The relation between sea level and forces are examined using the correlation and cross covariance analysis. The correlation and cross-covariance coe cients between sea level and sea level pressure at Port Sudan indicate that the sea level responds to atmospheric pressure as non-inverse barometer. The linear trend for the coastal area shows a sea level increases by 1:2 mm per year compared to 5:4 1:2 mm per year decrease for the period 1962 - 1979 at Port Sudan, but in good agreement with global mean sea-level rise of 1:5 0:4 mm per year [12]. Harmonic analysis (t tide) reveals the presence of a semi-annual and the annual components, with amplitudes 5:7 cm and 11:6 cm respectively. The spectral analysis shows the dominant tide at Port Sudan is diurnal tide, and in Gizan is found to semidiurnal tide. The magnitude of the tidal signal at Port Sudan is weak compared to that of Gizan, and that is because Port Sudan is located close to the amphidromic point of the semidiurnal constituent M2.
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