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Spatio-Seasonal Hyp...
Spatio-Seasonal Hypoxia/Anoxia Dynamics and Sill Circulation Patterns Linked to Natural Ventilation Drivers, in a Mediterranean Landlocked Embayment : Amvrakikos Gulf, Greece
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- Georgiou, Nikos (author)
- Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece.
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- Fakiris, Elias (author)
- Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece.
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- Koutsikopoulos, Constantin (author)
- Univ Patras, Dept Biol, Rion 26500, Greece.
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- Papatheodorou, George (author)
- Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece.
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- Christodoulou, Dimitris (author)
- Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece.
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- Dimas, Xenophon (author)
- Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece.
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- Geraga, Maria (author)
- Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece.
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- Kapellonis, Zacharias G. (author)
- Inst Marine Biol Resources & Inland Waters, Hellen Ctr Marine Res, 576A Vouliagmenis Ave, Athens 16452, Greece.
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- Vaziourakis, Konstantinos (author)
- Uppsala universitet,Limnologi
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- Noti, Alexandra (author)
- Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece.
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- Antoniou, Dimitra (author)
- Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece.
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- Ferentinos, George (author)
- Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece.
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Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece Univ Patras, Dept Biol, Rion 26500, Greece. (creator_code:org_t)
- 2021-06-03
- 2021
- English.
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In: Geosciences. - : MDPI. - 2076-3263. ; 11:6
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Abstract
Subject headings
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- Amvrakikos Gulf is a Mediterranean landlocked, fjord-like embayment and marine protected area suffering from natural, human-induced hypoxia/anoxia and massive fish mortality events. Seasonal marine geophysical and oceanographic surveys were conducted focusing on the water-circulation patterns at the sill and the spatial-seasonal distribution of dissolved oxygen (DO) in the gulf. Detailed surveys at the sill, the only communication route between the gulf and the open sea, revealed a two-layer water circulation pattern (top brackish outflow-bottom seawater inflow) and the role of the tide in the daily water exchange. Statistical analysis of the known natural drivers of DO distribution (density difference between the Ionian Sea and Amvrakikos, river inflow, wind) revealed that horizontal density gradients strongly affect anoxia reduction and seafloor oxygenation, while river inflow and wind mainly oxygenate volume/areas located above or within the pycnocline range, with DO concentrations > 2 mg/L. Complex geomorphology with well-formed internal basins contributes to the development and preservation of low DO conditions below the pycnocline. Finally, 43% of the seafloor and 36% of the gulf's total water volume are permanently hypoxic, and reach a maximum of 70% and 62%, respectively, in September and July. This work is tailored to future ecosystem management plans, decisions, and future research on coastal ecosystems.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Keyword
- oxygen deficiency
- sill circulation
- stratification
- oceanographic monitoring
- hypoxic
- anoxic volume
- ADCP
- CTD
- statistical analysis
- hypoxia quantification
- geomorphology
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Georgiou, Nikos
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Fakiris, Elias
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Koutsikopoulos, ...
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Papatheodorou, G ...
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Christodoulou, D ...
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Dimas, Xenophon
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Geraga, Maria
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Kapellonis, Zach ...
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Vaziourakis, Kon ...
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Noti, Alexandra
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Antoniou, Dimitr ...
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Ferentinos, Geor ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Oceanography Hyd ...
- Articles in the publication
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Geosciences
- By the university
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Uppsala University