Abstract

Kareem M Tonbol
The Daily SST Variations within the South-Eastern Mediterranean Sea
the behaviour of the sea surface temperature (SST) is important in the examination of many oceanographic activities. The variations in the SST are mainly controlled by atmospheric conditions. However, other physical parameters are also impacting on these variations, e.g. solar radiation, relative humidity, water depth, groundwater inflow and wind speed. Using a one year (04/02/99-04/02/00) data set, the present paper aims at describing the general behaviour of the daily SST variations within the south-eastern Mediterranean Sea region, off the Egyptian Mediterranean coast. The relationships between both the air temperature and wind speed, and the SST were built using regression techniques. The general pattern of the daily SST anomaly, produced in this research, reflects stability and homogeneity in the thermal distribution within the area of study. The seasonal presentation of the SST data reveals normal thermal variation behaviour, i.e. maxima in summer and minima in winter. There is a strong correlation between daily SST and air temperature variations, exceeding 0.91. The slightly differences between the produced mathematical constants may be attributed to both the change in the record periods and in the values of the recorded measurements. The inverse relationship between daily SST and wind speed variations is proved, with a correlation not exceeding -0.2. The observed odd behaviour of daily SST at location SST04, in the present study, is attributed to the shallowness of this station (7.8m depth) and also to the close position to the shore. Hence, seawater-seabed interaction and the shore processes may have their effects on the recorded SST. Moreover, SST04 is influenced by the dynamical process of the water exchange between Lake Manzalah and the Mediterranean Sea. The variations in the daily SST in the study area are more related to variations in air temperature rather than in wind speed.