Nutrient and oxygen sediment-water fluxes in Burgas Bay. 2022 IBER-BAS BRIDGE-BS WP5 survey.

Sediment samples for studying nutrient fluxes at the sediment/water interface were collected in 2022 from Burgas Bay, southwestern Black Sea. A total of 23 samples were collected from 6 locations by diver sampling. The seabed depth varied between 3 and 11 meters. Three of the locations were vegetated with Zostera sp. and three were non-vegetated. The sediment differed between locations and ranged between fine sand, medium sand and shelly gravelly mud. 

The sediment surface water layer (within 2 mm above the sediment surface) of each core was sampled with a syringe (5 mL water sample). Up to 1 mL was used to immediately measure dissolved oxygen concentration with a SI130 Microcathode Oxygen Electrode equipped with MC100 Microcell thermostatic chamber (Strathkelvin Instruments, Scotland). Porewaters (up to 5 mL) were collected by inserting a graduated stainless-steel needle (G-17, ~1.5 mm OD) into the sediments at 1 cm intervals, and gently sucking using a syringe. To prevent surface and/or upper porewater layer intrusion and mixing, the needle was equipped with a sampling flange as suggested in EPA (2013). In addition, each depth layer was sampled at a different position on the core surface. After the particulate matter has settled down, the remaining amount was transferred to precleaned plastic tubes, sealed and kept frozen until further analysis of the N-NO3, N-NH4 and P-PO4 concentrations (Grasshoff, 1976). Results lts are presented in mmol/m2/day.

 

 

Sediment samples for studying nutrient fluxes at the sediment/water interface were collected in 2022 from Burgas Bay, southwestern Black Sea. A total of 23 samples were collected from 6 locations by diver sampling. The seabed depth varied between 3 and 11 meters. Three of the locations were vegetated with Zostera sp. and three were non-vegetated. The sediment differed between locations and ranged between fine sand, medium sand and shelly gravelly mud. 

The sediment surface water layer (within 2 mm above the sediment surface) of each core was sampled with a syringe (5 mL water sample). Up to 1 mL was used to immediately measure dissolved oxygen concentration with a SI130 Microcathode Oxygen Electrode equipped with MC100 Microcell thermostatic chamber (Strathkelvin Instruments, Scotland). Porewaters (up to 5 mL) were collected by inserting a graduated stainless-steel needle (G-17, ~1.5 mm OD) into the sediments at 1 cm intervals, and gently sucking using a syringe. To prevent surface and/or upper porewater layer intrusion and mixing, the needle was equipped with a sampling flange as suggested in EPA (2013). In addition, each depth layer was sampled at a different position on the core surface. After the particulate matter has settled down, the remaining amount was transferred to precleaned plastic tubes, sealed and kept frozen until further analysis of the N-NO3, N-NH4 and P-PO4 concentrations (Grasshoff, 1976). Results lts are presented in mmol/m2/day.

 

 

Disciplines

Biological oceanography, Chemical oceanography

Keywords

flux, nutrients, eutrophication, zostera, nitrates, ammonnia, phosphates, dissolved oxygen, sediment-water flux

Location

42.539N, 42.237S, 27.98E, 27.458W

Devices

DO concentration in pore waters were measured  with a SI130 Microcathode Oxygen Electrode equipped with MC100 Microcell thermostatic chamber (Strathkelvin Instruments, Scotland).
Porewater concentrations of nitrates, ammonnia and phosphates were measured following standard marine chemistry methodologies (Grashoff 1976)  with a lab spectrophotometer ( Merck Millipore Prove 300). 

Data

FileSizeFormatProcessingAccessend of embargo
Nutrient and oxygen fluxes data in ODV format
3 KoTEXTProcessed data 2026-01-01
Metadata file of data set in Seadatanet format (Mikado-generated)
49 KoXMLProcessed data -
How to cite
Karamfilov Ventzislav, Bobchev Nikola, Klayn Stefania, Berov DImitar (2022). Nutrient and oxygen sediment-water fluxes in Burgas Bay. 2022 IBER-BAS BRIDGE-BS WP5 survey. SEANOE. https://doi.org/10.17882/98331

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