Spatio-Seasonal Hypoxia/Anoxia Dynamics and Sill Circulation Patterns Linked to Natural Ventilation Drivers, in a Mediterranean Landlocked Embayment: Amvrakikos Gulf, Greece

Georgiou, NikosUniv Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece. (författare)

Spatio-Seasonal Hypoxia/Anoxia Dynamics and Sill Circulation Patterns Linked to Natural Ventilation Drivers, in a Mediterranean Landlocked Embayment : Amvrakikos Gulf, Greece

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.

NATURVETENSKAP Geovetenskap och miljövetenskap Oceanografi, hydrologi och vattenresurser hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Oceanography, Hydrology and Water Resources hsv//eng
oxygen deficiency
sill circulation
stratification
oceanographic monitoring
hypoxic
anoxic volume
ADCP
CTD
statistical analysis
hypoxia quantification
geomorphology

Fakiris, EliasUniv Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece. (författare)
Koutsikopoulos, ConstantinUniv Patras, Dept Biol, Rion 26500, Greece. (författare)
Papatheodorou, GeorgeUniv Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece. (författare)
Christodoulou, DimitrisUniv Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece. (författare)
Dimas, XenophonUniv Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece. (författare)
Geraga, MariaUniv Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece. (författare)
Kapellonis, Zacharias G.Inst Marine Biol Resources & Inland Waters, Hellen Ctr Marine Res, 576A Vouliagmenis Ave, Athens 16452, Greece. (författare)
Vaziourakis, KonstantinosUppsala universitet,Limnologi(Swepub:uu)konva985 (författare)
Noti, AlexandraUniv Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece. (författare)
Antoniou, DimitraUniv Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece. (författare)
Ferentinos, GeorgeUniv Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece. (författare)
Univ Patras, Dept Geol, Lab Marine Geol & Phys Oceanog, Rion 26500, Greece.Univ Patras, Dept Biol, Rion 26500, Greece. (creator_code:org_t)

Av författaren/redakt...: Georgiou, Nikos; Fakiris, Elias; Koutsikopoulos, ...; Papatheodorou, G ...; Christodoulou, D ...; Dimas, Xenophon; visa fler...; Geraga, Maria; Kapellonis, Zach ...; Vaziourakis, Kon ...; Noti, Alexandra; Antoniou, Dimitr ...; Ferentinos, Geor ...; visa färre...

Om ämnet

NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...; och Oceanografi hydr ...

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.