The study of chlorophyll concentration behavior over southern coasts of Iran with an emphasis on the cold season of the year

Document Type : Original Article

Authors

1 Atmospheric Science and Meteorological Research Center (ASMERC), Tehran, Tehran

2 Atmospheric Science and Meteorological Research Center (ASMERC), Tehran, Iran

3 Department of Remote Sensing and GIS, Faculty of Geography, University of Tehran, Tehran, Iran

Abstract

The concentration of chlorophyll in marine environments indicates the quantity of photosynthetic plankton (phytoplankton),found in marine ecosystems.Phytoplankton populations are affected by weather conditions such as Sea Surface Temperature and Winds.They are also influenced by Aerosol Optical Depth (AOD),which can show the existence of dust.Moreover,there are seasonal variations and the correlation between these factors varies according to the depths.Despite the decrease in temperature and an increase in pressure on land areas during winter,which is accompanied by a decrease in strong winds, the formation of atmospheric fronts and strong winds caused the transfer of dust from susceptible springs in Saudi Arabia and the UAE and dust was transferred to it from the southern coast of the Persian Gulf. Investigating the long-term relationship between SST changes and the AOD with chlorophyll concentration on the Persian Gulf coasts as well as the Oman Sea,using daily MODIS products in the period of 2003 to 2020 demonstrates a strong correlation in coastal areas with the lowest depth.trend of SST and AOD on the both Seas is similar, along with the lowest values during the winter, while the seasonal trend show, the highest values of chlorophyll concentrations, in winter.Besides examining long-term chlorophyll concentration behavior over the Sea of Oman and the Persian Gulf, an emphasis was applied to the cold season of the year on February 17-22, 2018 for understanding the relationships between chlorophyll, AOD,and SST, showing the possibility of time delay in the correlation between sea surface temperature and optical depth of aerosols with chlorophyll concentration.

Keywords


  1. Gallisai, R., Peters, F., Volpe, G., Basart, S. and Baldasano, J.M., (2014), Saharan dust deposition may affect phytoplankton growth in the Mediterranean Sea at ecological time scales, PloS one, 9(10).
  2. Paytan, A., Mackey, K.R., Chen, Y., Lima, I.D., Doney, S.C., Mahowald, N., Labiosa, R. and Post, A.F., (2009), Toxicity of atmospheric aerosols on marine phytoplankton, Proceedings of the National Academy of Sciences, 106(12), pp.4601-4605.
  3. Tan, S.C., Shi, G.Y., Shi, J.H., Gao, H.W. and Yao, X., (2011), Correlation of Asian dust with chlorophyll and primary productivity in the coastal seas of China during the period from 1998 to 2008, Journal of Geophysical Research: Biogeosciences, 116(G2).
  4. Deng, Z.Q., Han, Y.X., Bai, H.Z. and Zhao, T.L., (2008), Effect of dust aerosol production in China mainland on marine primary productivity, China Environmental Science, 28, pp.872-876.
  5. Al-Taee, I.A.A., (2018), Salinity effect chlorophyll significantly. Plant Archive, 18(1), 723-726.
  6. Mahpeykar, O., & Khalilabadi, M. R. (2021). Numerical modelling the effect of wind on Water Level and Evaporation Rate in the Persian Gulf. International Journal of Coastal and Offshore Engineering, 6(1), 47-53.
  7. Moradi, M. (2022). Inter-comparison of single-sensor and merged multi-sensor ocean color chlorophyll-a products in the shallow turbid waters - case study: Persian Gulf. International Journal of Coastal and Offshore Engineering7(2), 1-10.
  8. Zarasvandi, A., Carranza, E. J. M., Moore, F., & Rastmanesh, F., (2011), Spatio-temporal occurrences and mineralogical–geochemical characteristics of airborne dust in Khuzestan Province (southwestern Iran), Journal of geochemical exploration, 111(3), 138-151.
  9. Cao, H., Liu, J., Wang, G., Yang, G., & Luo, L., (2015), Identification of sand and dust storm source areas in Iran, Journal of Arid Land, 7(5), 567-578.
  10. Peyman Heidarian, A. Azhdari1; M. Jodaki, J. Darvishi Khatooni, R. Shahbazi., (2017), Identifying interior sources of dust storms using remote sensing, GIS and geology (case study: Khuzestan province), scientific Quarterly Journal GEOSCIENCES, 6(27), Issue 105, Page 33-46, DOI:10.22071/GSJ.2017.53928