scholarly journals Primary production and size-fractionated structure of the Black Sea phytoplankton in the winter-spring period

1991 ◽  
Vol 73 ◽  
pp. 25-31 ◽  
Author(s):  
DK Krupatkina ◽  
ZZ Finenko ◽  
AA Shalapyonok
Keyword(s):  
Primary Production ◽  
Black Sea ◽  
The Black Sea ◽  
Spring Period

ATMOSPHERIC N DEPOSITION TO THE COASTAL AREA OF THE BLACK SEA: SOURCES, INTRA-ANNUAL VARIATIONS AND IMPORTANCE FOR BIOGEOCHEMISTRY AND PRODUCTIVITY OF THE SURFACE LAYER

2017 ◽  
Author(s):  
Alla Varenik ◽  
Alla Varenik ◽  
Sergey Konovalov ◽  
Sergey Konovalov
Keyword(s):  
Primary Production ◽  
Black Sea ◽  
Marine Ecosystem ◽  
C:N Ratio ◽  
N Deposition ◽  
Local Source ◽  
The Black Sea ◽  
Coastal Zones ◽  
Atmospheric N Deposition ◽  
Urban Location

Atmospheric precipitations can be an important source of nutrients to open and coastal zones of marine ecosystem. Jickells [1] has published that atmospheric depositions can sup-port 5-25% of nitrogen required to primary production. Bulk atmospheric precipitations have been collected in a rural location at the Black Sea Crimean coast – Katsiveli settlement, and an urban location – Sevastopol city. Samples have been analyzed for inorganic fixed nitrogen (IFN) – nitrate, nitrite, and ammonium. Deposi-tions have been calculated at various space and time scales. The monthly volume weighted mean concentration of IFN increases from summer to winter in both locations. A significant local source of IFN has been revealed for the urban location and this source and its spatial influence have been quantified. IFN deposition with atmospheric precipitations is up to 5% of its background content in the upper 10 m layer of water at the north-western shelf of the Black Sea. Considering Redfield C:N ratio (106:16) and the rate of primary production (PP) in coastal areas of the Black Sea of about 100-130 g C m-2 year-1 we have assessed that average atmospheric IFN depositions may intensify primary production by 4.5% for rural locations, but this value is increased many-fold in urban locations due to local IFN sources.

ATMOSPHERIC N DEPOSITION TO THE COASTAL AREA OF THE BLACK SEA: SOURCES, INTRA-ANNUAL VARIATIONS AND IMPORTANCE FOR BIOGEOCHEMISTRY AND PRODUCTIVITY OF THE SURFACE LAYER

2017 ◽  
Author(s):  
Alla Varenik ◽  
Alla Varenik ◽  
Sergey Konovalov ◽  
Sergey Konovalov
Keyword(s):  
Primary Production ◽  
Black Sea ◽  
Marine Ecosystem ◽  
C:N Ratio ◽  
N Deposition ◽  
Local Source ◽  
The Black Sea ◽  
Coastal Zones ◽  
Atmospheric N Deposition ◽  
Urban Location

Atmospheric precipitations can be an important source of nutrients to open and coastal zones of marine ecosystem. Jickells [1] has published that atmospheric depositions can sup-port 5-25% of nitrogen required to primary production. Bulk atmospheric precipitations have been collected in a rural location at the Black Sea Crimean coast – Katsiveli settlement, and an urban location – Sevastopol city. Samples have been analyzed for inorganic fixed nitrogen (IFN) – nitrate, nitrite, and ammonium. Deposi-tions have been calculated at various space and time scales. The monthly volume weighted mean concentration of IFN increases from summer to winter in both locations. A significant local source of IFN has been revealed for the urban location and this source and its spatial influence have been quantified. IFN deposition with atmospheric precipitations is up to 5% of its background content in the upper 10 m layer of water at the north-western shelf of the Black Sea. Considering Redfield C:N ratio (106:16) and the rate of primary production (PP) in coastal areas of the Black Sea of about 100-130 g C m-2 year-1 we have assessed that average atmospheric IFN depositions may intensify primary production by 4.5% for rural locations, but this value is increased many-fold in urban locations due to local IFN sources.

scholarly journals Assessment of Hadzhibeysky estuary and forecasting possible water level in it

2017 ◽  
pp. 156-163
Author(s):  
Zh.R. Shakirzanova
Keyword(s):  
Surface Water ◽  
Black Sea ◽  
Treatment Plant ◽  
Anthropogenic Factors ◽  
The Black Sea ◽  
Spring Flood ◽  
Spring Period ◽  
Term Forecast ◽  
Long Term Forecasting

Introduction. Modern hydrology of the Hadzhibeysky estuary is due to natural and anthropogenic factors and characterized by their intense economic use. Since the beginning of the last century, there was an intense discharge of municipal waters from Odessa (biological treatment plant "North"). This led to a significant increase in the levels of water in the estuary, which threatened to destroy the dam that separates the estuary from the sea, with the possible flooding of residential areas and enterprises of the Peresip area, as well as the road, on the dam, especially in disastrously high water years. Purpose. The purpose problems – are estimation of filling the closed estuaries-reservoirs in north-west area of the Black sea and long–term forecasting of their condition during the spring period of year. The first task – an analysis of conditions of the Hadzhibeysky estuary in the presence of an exceptional spring flood and rain floods of exceedance probability (P = 1%). The second task – is to develop a methodology for the long-term forecasting of filling of the Hadzhibeysky estuary during the spring flood, which is the most abundant phase in the hydrological regime into the territory. Results. For the first time, the possibility of assessing the filling degree surface water from melting snow and rainfall when the estimated probability of exceeding P=1% in the closed estuaries-reservoirs of the Black Sea areas. The method of the long-term forecast of surface water during the spring period for the closed estuaries was substantiated. Typification of spring floods in accordance with their water content according to the model – discriminant function DF, which takes account of the complex of factors having an influence upon conditions of spring flood formation. Setting the probability of occurrence of the forecasting flow layers in the long-term period are implemented. Conclusion. This method allows risk assessment for sustainable land – and water use planning within the Black Sea estuaries. The method of the long-term forecast was realized by the author in operational work at the Hydrometeorological Center of the Black and Azov Seas.

Validation of spectral model for assessment of primary production in the Black Sea

2021 ◽  
Author(s):  
Tanya Churilova ◽  
Vyacheslav Suslin ◽  
Tatiana Efimova ◽  
Nataliia Moiseeva ◽  
Elena Skorokhod
Keyword(s):  
Primary Production ◽  
Black Sea ◽  
Spectral Model ◽  
The Black Sea

scholarly journals Seasonal dynamics of the main primary production characteristics of phytoplankton and its microzooplankton grazing in the surface coastal waters of the Black sea

2017 ◽  
pp. 114-120
Author(s):  
L.V. Stelmakh ◽  
Keyword(s):  
Primary Production ◽  
Black Sea ◽  
Coastal Waters ◽  
Grazing Rate ◽  
The Black Sea ◽  
Average Cell ◽  
Average Cell Volume ◽  
Annual Primary Production ◽  
Microzooplankton Grazing ◽  
Production Characteristics

Seasonal variability of phytoplankton biomass, “pure” primary production and its share consumed micro¬zooplankton, as well as the specific microzooplankton grazing rate of phytoplankton for the surface layer (0-1 m) in coastal waters of the Black Sea was studied. Almost 80% of the total annual primary’ produc¬tion of phytoplankton is created by phytoplankton with the average cell volume .from 150 to 4000 mm3. The main share of annual primary production, eaten by microzooplankton (86%) is also associated with these algae sized groups.

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