BG (https://water.europa.eu/marine/assessment-module/national-descriptors-assessments/bg/blk/d5/art9/@@view-report-data-2012)

RO (https://water.europa.eu/marine/assessment-module/national-descriptors-assessments/ro/blk/d5/art9/@@view-report-data-2012)

12

3

InputN_Psubst (1)
NutrientOrgEnrich (1)

Ammonium (NH4-N) concentration, coastal, summer, 2000-2011 (1.5 µM/l)


Ammonium (NH4-N) concentration, open sea, summer, 2000-2011 (0.8 µM/l)


Ammonium (NH4-N) concentration, shelf, summer, 2000-2011

5.1.1. For coastal waters, ecological status characterization was performed using "Studies on the development of classification and comprehensive assessment of the status of surface water (transitional waters and coastal waters) as required by the Water Framework Directive 2000/60/EC on the basis of biological chemical and hydromorphological elements", for natural water bodies and heavily modified water bodies", developed by the National Institute for Marine Research and Development,,Grigore Antipa". The period studied was 2007-2011, data from national monitoring network. Determined by comparing annual averages of concentrations in the water column, it was found that N-NH4 values ​​were exceeded in the whole period, O2 values ​​were rated in good ecological condition, and the values ​​N-NO3, N-NO2, P-PO4, BOD5 reached benchmark status.


5.1.1. For transitional waters, ecological status characterization was performed using "Studies on the development of classification and comprehensive assessment of the status of surface water (transitional waters and coastal waters) as required by the Water Framework Directive 2000/60/EC on the basis of biological chemical and hydromorphological elements", for natural water bodies and heavily modified water bodies", developed by the National Institute for Marine Research and Development,,Grigore Antipa". The period studied was 2007-2011, data from national monitoring network. Determined by comparing annual averages of concentrations in the water column, it was found that N-NH4 values ​​were exceeded in the whole period, O2 values ​​were rated in good ecological condition, and the values ​​N-NO3, N-NO2, P-PO4, BOD5 reached benchmark status.


5.1.2. Within 1959-2011, at Constanţa, the molar ratios oscillated according to nutrients concentrations. Generally, values have been close to Danube’s ratios, especially within 2000-2007, confirming the river input influence. Taking into consideration the mean ratio N/P from the intense eutrophication period (1980-1995) and the increasing values from the post eutrophication interval, due to phosphate decrease GES could be establish for N/P between 10-16.

Chlorophyll a concentration, coastal, summer, 1990-2011


Chlorophyll a concentration, open sea, summer, 1990-2011


Secondary phytoplankton bloom at a taxonomic level (5.2.4), shelf, summer, 2006-2011

5.2.2. Transparency was assessed from historical data, 1970-2007, N=2434, on stations with depths 0-50m. The values oscillated within 0.2-26. The long term trend highlights the decreasing trend since ‘70s and. Within 1970-2007, transparency oscillated seasonally within 2.0-7.5m and spatial within 1.7-9.0m and the national legislation establish the limit for ecological state to 2.0m. The variability interval is 3.0-9.0m shared as follows: poor <2m, moderate 2-3m, good 3-5m, very good >5m. GES could be represented by the interval 3.0-9.0m.


5.2.4. The reference data analysis for the coastal waters emphasized the diatoms dominance with 54% of total species followed by dinoflagellates, 31%. The others group species represented 15. The ecological groups composition, due to salinity resistance, the freshwate - brackishwater species represents 18% the dominance being of marine and brackish water species, 82%. The quality status assessment, based only the phytoplankton taxonomic composition need special adjustments. However, GES could be defined as a stable ratio between diatoms and dinoflagellates nearby land based sources.

oxygen saturation (OS%), coastal, upper homogeneous layer, summer, 2000-2011


oxygen saturation (OS%), open sea, upper homogeneous layer, summer, 2000-2011


oxygen saturation (OS%), shelf, upper homogeneous layer, summer, 2000-2011

5.3.1. GES could be represented by stable spatial distribution of perennial species (Cystoseira, Zostera).


5.3.2. At the Romanian Black Sea coast there are not permanent hypoxic areas, the events being more correlated with climatic factors than biological ones. The hypoxic events were seasonally found only in the warm period. The statistic analysis of the historical data from East Constanta transect, led to the establishment of the specific interval of the water column (0-50m) as 275.0-365.0μM, (50% of values from 1963-2007). The interval was shared as follows: poor <100µM, moderate 100.0-275.0µM, good 275.0-400.0µM, very Good >400.0µM. GES could be achieved by keeping 75% of measured values in the specific interval attribute to water column.

100.0% (9)

28.6% (7)

0.0% (0 - 0)

28.6% (N-NH4=39% - N-NH4=67,21%)