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Environmental impacts of physical and dynamical characteristics of the southern coastal waters of the Caspian Sea

Published online by Cambridge University Press:  29 June 2021

Siamak JAMSHIDI Open the ORCID record for Siamak JAMSHIDI [Opens in a new window]  and
Mahdieh JAFARI
Siamak JAMSHIDI*
Affiliation:
Iranian National Institute for Oceanography and Atmospheric Sciences (INIOAS), Tehran1411813389, Iran.
Mahdieh JAFARI
Affiliation:
Shahid Beheshti University, Tehran1983969411, Iran.
*
*Corresponding author. Email: [email protected]
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Abstract

This research evaluated the variability of current characteristics and seawater properties in the middle part of the southern shelf of the Caspian Sea. The effect of the coastal flow on marine debris dispreading was assessed in the southern Caspian Sea for the first time. The findings showed the existence of thermal stratification containing seasonal thermocline with thickness of about 40 m in the water column. Maximum monthly along-shore current velocities around 1.3 m s−1 were observed in November and December. Monthly variations were clearly found in both flow velocity and local wind components. However, no significant levels of correlation between wind and current speeds were observed during the study in the region. In some cases, the mean monthly cross-shore component velocities were measured at about 29 cm s−1 in November. The findings indicated that there was no upwelling phenomenon associated to the regional wind in the study area. In situ current measurements indicated dominant east and north-northeast directions, presumably related to the effect of general circulation in the southern basin. Current profiles in the water column displayed similarity in directions at 10, 15 and 20 m depths over the continental shelf. The field samples and analysis revealed that the soft and smaller-scale seawater litters can be carried long distances by the current along the coast. Most coastal based and marine litters originated from the tourist activities (in the middle and western parts of the shores) and waste emanated from the river (Tonekabon-Nowshahr).

Keywords

Caspian seacurrentenvironmental characteristicsSouthern shelf
Type
Articles
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 112 , Issue 2 , June 2021 , pp. 111 - 124
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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