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Study of the Long-term Average Concentration of Chlorophyll a and Its Relation to Variations in Sea Level Temperature and Aerosol Optical Depth over the Sea of Oman and the Persian Gulf (2003-2020)

Document Type : Original Article

Authors
Noushin Khoddam 1
Sara Attarchi 2
Mehdi Rahnama 3
Saviz Sehat Kashani 3
Sahar Tajbakhsh 3
1 Ph.D. in Meteorology, Atmospheric Science and meteorology Research Center, Tehran, Iran
2 Assistant professor, University of Tehran, Faculty of Geography, Tehran, Iran
3 Assistant professor, Atmospheric Science and meteorology Research Center, Tehran, Iran
10.30467/nivar.2021.146147
Abstract
Chlorophyll concentrations in marine environments indicate phytoplankton levels and ultimately the production of marine ecosystems. Chlorophyll concentration is not constant and depends on quantities such as sea surface temperature and aerosols optical depth, it also has seasonal variations and the correlation between these factors is various at different depths. Investigating the long-term relationship (2003 to 2020) between sea level temperature changes and aerosol optical depth with chlorophyll concentration on the Persian Gulf and the Sea of Oman coasts using daily MODIS products shows a considerable correlation in coastal areas. This correlation is the highest in shallowest water depths. The trend of sea-level temperature and light depth of aerosols changes in the two regions of the Persian Gulf and the Sea of Oman is similar, and its highest values are observed in summer, while its lowest is observed in winter. Remarkably, this seasonal trend is reversed in chlorophyll concentrations, with the lowest values observed in summer and the highest in winter. Additionally, the study of dust occurrence on July 30, 2018, showed the possibility of time delay in the correlation between sea-level temperature and aerosol optical depth with chlorophyll-a concentration.
Keywords
Chlorophyll
SST
AOD
Persian Gulf
Oman Sea
Dust
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Nivar
Volume 45, 114-115 - Serial Number 114
September 2021
Pages 130-139

  • Receive Date 26 December 2021
  • Revise Date 07 January 2022
  • Accept Date 20 January 2022
  • Publish Date 23 September 2021