Abstract
Presence, distribution, and importance of deep chlorophyll maximum (DCM) in the Red Sea were examined from the oceanographic data gathered during four cruises between 2012 and 2015. The data, which are new and extensive for this sea region, showed that the DCM is a permanent feature in the Red Sea, characterized by a south-north gradient and spatially alternating highs and lows in strength. The north-south gradient is possibly related to the progressive sinking of Gulf of Aden Intermediate Water (GAIW) layer which is the source of nutrients to the DCM and the alternating patterns of Chl a concentrations in DCM, to the entrainment of GAIW in eddy circulations across the basin. The flow patterns of GAIW in the Red Sea thus become a major mechanism of sustaining the DCM in the Red Sea. While the DCM is important in the overall primary production, the Chl a content of DCM and its percent contribution to column production were much less than in other studies. This could be attributed, based on the distribution of phaeopigments/Chl a ratios, to grazing pressure. The composition of phytoplankton of DCM (as size fractions and taxonomic groups) and patterns of changes in it in response to climate changes could be useful avenues of future research in Red Sea thanks to the latter being already an extreme environment.
References
Abdel-Maoti AR (1990) Particulate organic matter in the subsurface chlorophyll maximum of the southeastern Mediterranean. Oceanol Acta 13:307–315
Barnett ML, Kemp AES, Hickman AE, Purdie DA (2019) Shelf sea subsurface chlorophyll maximum thin layers have a distinct phytoplankton community structure. Cont Shelf Res 174:140–157
Cullen JJ (1982) The deep chlorophyll maximum: comparing vertical profiles of chlorophyll a. Can J Fish Aquat Sci 39:791–803
Cullen JJ (2015) Subsurface chlorophyll maximum layers: enduring enigma or mystery solved? Annu Rev Mar Sci 7:19.1–19.33
Fernand L, Weston K, Morris T, Greenwood N, Brown J, Jickells T (2013) The contribution of the deep chlorophyll maximum to primary production in a seasonally stratified shelf sea, the North Sea. Biogeochemistry 113:53–166
Hanson CE, Pesant S, Waite AM, Pattiaratchi CB (2007) Assessing the magnitude and significance of deep chlorophyll maxima of the coastal eastern Indian Ocean. Deep-Sea Res II Top Stud Oceanogr 54:884–901
Hickman A (2007) The photophysiology and primary productivity of phytoplankton within the deep chlorophyll maximum. University of Southampton, Faculty of Engineering Science and Mathematics School of Ocean and Earth Sciences, Doctoral Thesis, 237pp.
Holt J, Wakelin S, Lowe J, Tinker J (2010) The potential impacts of climate change on the hydrography of the northwest European continental shelf. Prog Oceanogr 86:361–379
Kheireddine M, Ouhssain M, Claustre H, Uitz J, Gentili B, Jones BH (2017) Assessing pigment-based phytoplankton community distributions in the Red Sea. Front Mar Sci 4:1–18
Latasa M, Cabello AM, Moran XAG, Massana R, Scharek R (2017) Distribution of phytoplankton groups within the deep chlorophyll maximum. Limnol Oceanogr 62:665–685
Lohrenzen CJ (1966) A method for the continuous measurement of in vivo chlorophyll concentration. Deep-Sea Res 13:223–227
Murray SP, Johns W (1997) Direct observations of seasonal exchange through the Bab al Mandab strait. Geophys Res Lett 24:2557–2560
Qurban MA, Wafar M, Jyothibabu R, Manikandan KP (2017) Patterns of primary production in the Red Sea. J Mar Syst 169:87–98
Revelante N, Gilmartin M (1995) The relative increase of larger phytoplankton in a subsurface chlorophyll maximum of the northern Adriatic Sea. J Plankton Res 17:1535–1562
Shyam R, Mioni C, Ritchie AE, Lai J, Johnson ZI (2008) Iron/light co-limitation of the deep chlorophyll maximum in the western Pacific Ocean. Proceedings of American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 USA, March 2008.
Souvermezoglou E, Metzl N, Poisson A (1989) Red Sea budgets of salinity, nutrients and carbon calculated in the Strait of Bab-El-Mandab during the summer and winter seasons. J Mar Res 47:441–456
Velicic D, Orlic M, Jasprica N (2008) The deep chlorophyll maximum in the coastal north eastern Adriatic Sea, July 2007. Acta Botan Croatica 67:33–43
Wafar M, Ashraf M, Manikandan KP, Qurban MA, Kattan Y (2016a) Propagation of Gulf of Aden Intermediate Water (GAIW) in the Red Sea during autumn and its importance to biological production. J Mar Syst 154:243–251
Wafar M, Qurban MA, Ashraf M, Manikandan KP, Flandez AV, Balala AC (2016b) Patterns of distribution of inorganic nutrients in Red Sea and their implications to primary production. J Mar Syst 156:86–98
Weikert H (1987) Plankton and the pelagic environment. In: Edwards A, Head SM (eds) Red Sea Key Environmental Series. Pergamon Press, Oxford, pp 90–111
Weston K, Fernand L, Mills KD, Delahunty R, Brown J (2005) Primary production in the deep chlorophyll maximum of the central North Sea. J Plankton Res 27:909–922
Yentsch CS, Menzel DW (1963) A method for the determination of phytoplankton chlorophyllby fluorescence. Deep-Sea Res 10:221–231
Yentsch CS, Wood L (1961). Measurements of primary production in the Red Sea, Gulf of Aden and Indian Ocean. Wood Hole Oceanographic Institution. Ref 61-6, Appendix 8:6.
Acknowledgements
We are grateful to the Center for Environment and Water, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia, and Saudi Aramco, Dhahran, for providing research facilities. We thank Prof. Pierre Le Corre and two reviewers for helpful comments and advice in finalization of the manuscript.
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Wafar, M., Qurban, M.A., Nazeer, Z. et al. Deep chlorophyll maximum (DCM) in the Red Sea. Arab J Geosci 14, 211 (2021). https://doi.org/10.1007/s12517-021-06581-x
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DOI: https://doi.org/10.1007/s12517-021-06581-x