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Study of spatial and temporal changes in chlorophyll-a and dissolved oxygen under the influence of physical parameters of seawater in the southern part of the Caspian Sea
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Siamak Jamshidi    |
| INIOAS , jamshidi@inio.ac.ir |
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Abstract: (10 Views) |
Background and Objectives: The Caspian Sea is the largest landlocked water body of special importance among the countries of the Eurasian region. Considering its vastness, existence of biological resources and valuable sturgeon, research on this marine ecosystem is one of the priorities of oceanography. In previous studies, monitoring of chlorophyll-a levels in the southern part of the Caspian Sea has mainly been based on the analysis of satellite data sets, and it has not been possible to investigate the vertical distribution of chlorophyll concentration and its changes in the deeper layers of the southern Caspian Sea water. On the other hand, continuous monitoring and study of the dissolved oxygen concentration in the Caspian Sea was considered as another vital parameter. The aim of this research is to study the spatial and temporal changes of some important parameters such as chlorophyll-a, dissolved oxygen, and pH in the southern part of the Caspian Sea.
Methods: The research method is to analyze field data collected using a profiler of seawater physicochemical parameters. The desired information was collected from fixed stations planned along cross-sections in the southern part of the Caspian Sea.
Findings: The results related to the spatial and temporal changes of chlorophyll-a, dissolved oxygen and pH components in different seasons were presented. The findings showed that the maximum chlorophyll values were measured in the subsurface layers and at depths of about 10 meters. Mainly, the temperature and depth (pressure) parameters were observed as effective factors in the changes of dissolved oxygen.
Conclusion: Based on the analyses, significant amounts of dissolved oxygen and chlorophyll are produced in the subsurface layer of seawater, and this is important from an environmental and fisheries perspective. It is suggested that despite the high costs of field operations and the limitations of instrumental measurements, research should continue in different months of the year and in wider study areas. |
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| Keywords: Caspian Sea, Dissolved Oxygen, Physical Oceanography, Continental Shelf, Chlorophyll Concentration |
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Type of Study: Research/ Original/ Regular Article |
Subject:
Physical Oceanography
Received: 2026/05/6 | Revised: 2026/06/22 | Accepted: 2026/06/5
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