Variations of vertical structure of water temperature in the coastal area of Noshahr and Lavijrood

Seasonal and spatial variations of temperature vertical structure are investigated in Noshahr and Lavijrood regions. Field measurements were carried out in spring and autumn 2012 and autumn 2016, using CTD up to a depth of 70 meters. In the spring three layers, namely mixed layer, thermocline, and deep layer are clearly distinguishable, while in the autumn, the deep layer is not observed. During the spring, the mixed layer is observed up to the depth of 10 m with temperature ranges from 21.5 to 22.5 °C and the thermocline is observed at the depth between 10 - 45 m with temperature ranges between 21.5 and 8 °C, and underneath, the deep layer is located. During the autumn, the mixed layer has been observed up to the depth of 40 m with temperature range between 20 and 20.5 °C, and a thermocline between 40 and 60 m with temperature range between 14 and 20 °C. Hence, compared to the spring, the depth of the mixed layer and thermocline increase in the autumn, and as expected the temperature of these layers decreases. The seasonal and spatial comparison between Noshahr and Lavijrood shows that, while in the spring, the mixed layer depth is deeper in Noshahr, the difference is not significant in the autumn.