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AuthorJassem A., Al-Thani
AuthorSoliman, Yousria
AuthorAl-Maslamani, Ibrahim A.
AuthorYigiterhan, Oguz
AuthorAl-Ansari, Ebrahim M.A.S.
Available date2023-11-27T08:42:48Z
Publication Date2023-04-05
Publication NameEstuarine, Coastal and Shelf Science
Identifierhttp://dx.doi.org/10.1016/j.ecss.2023.108260
CitationAl-Thani, J. A., Soliman, Y., Al-Maslamani, I. A., Yigiterhan, O., & Al-Ansari, E. M. (2023). Physical drivers of chlorophyll and nutrients variability in the Southern-Central Arabian Gulf. Estuarine, Coastal and Shelf Science, 283, 108260.‏
ISSN02727714
URIhttps://www.sciencedirect.com/science/article/pii/S0272771423000501
URIhttp://hdl.handle.net/10576/49706
AbstractThe southern-central Arabian Gulf demonstrates a poor understanding of nutrients and chlorophyll dynamics in physical-biogeochemical settings. Here, using data of chlorophyll, nutrients and hydrographic parameters collected in two cruises in summer 2019 and winter 2020, we examined variability in nutrients and chlorophyll concentrations, and the driving mechanisms. Summer thermal stratification enhanced by intrusion of fresher surface water plume from the Arabian Sea developed a hypoxic zone (DO < 2.0 mL/L) below the thermocline. Nitrate and ammonium summer concentrations (2.24 ± 0.36, 1.70 ± 0.17 μM) were about 3 times the winter concentrations. Nutrient stoichiometry showed a Redfield-like nitrogen/phosphorus (N:P) ratio in summer (15.9:1) and a nitrogen limitation in winter (N:P = 4:1). Chlorophyll-a content in summer (mean = 0.80 mg/m3) was about 1.4 times the winter concentration (mean = 0.58 mg/m3) (p > 0.05). Photo-protective carotenoids content in summer (0.59 mg/m3) was about 2.7 times their winter concentration. Winter cooling resulted in downwelling of dense water on the shallow coastal banks, which enhanced near bottom oxygen concentrations and swept away nutrient-rich water resulting in lower winter chlorophyll. This research features aspects of the physical and biogeochemical drivers underpinning the dynamics of nutrients and chlorophyll in the central Gulf.
SponsorThis work was funded by QU Grant [QUST-2-CAS-2019-44].
Languageen
PublisherAcademic Press
SubjectChlorophyll-a
Nutrients
Hypoxia
Physical drivers
Arabian Gulf
TitlePhysical drivers of chlorophyll and nutrients variability in the Southern-Central Arabian Gulf
TypeArticle
Volume Number283
Open Access user License http://creativecommons.org/licenses/by/4.0/
dc.accessType Open Access


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