Mean sea level variability along the Northern Coast of the Oman Sea and its response to monsoon and the North Atlantic oscillation index from tide gauge measurement

Abstract EN

-Sea level analysis along the Northern Coast of the Oman Sea was investigated on the basis of tide gauge measurements.

Meteorological parameters, along with monsoon and NAO (North Atlantic Oscillation) indices were used to study the response of sea level to local and global forcing.

The relation between sea level and forces were examined.

Low correlation coefficient (-0.35) between sea level and atmospheric pressure at Chabahar indicated that the response to atmospheric pressure was not an inverse barometric.

The nature of local inverse barometric effects were examined through a series of statistical models.

Analysis between sea level and atmospheric pressure reveals a significant coherence, which meant that along the Northern Coast of Oman Sea, mean sea level responded to atmospheric pressure as an inverse barometer.

It can be noticed that the difference between atmospheric pressure and mean sea level was due to alongshore wind stress forcing and was consistent with that expected from Ekman dynamics.

The four EOF modes capture 87.16% for the x-component and 94.70% for the y-component of the total variance and were statistically significant.

Linear regression and ARIMA model forecasts were fitted to sea level and compared to the actual data.

Even though both models gave similar results, the ARIMA model performed considerably better