1. Baltic Sea GIG

2. Description of types that have been intercalibrated Type Salinity psu ExposureDepthIce daysOther Characteristics CW B00.5- 3Shelteredshallow  150 Sites in Botnian Bay (Northern Quark) CW B23-6Shelteredshallow> 150Sites in Bothnian Sea CW B33-6Shelteredshallow90-150Sites in the area extending from the southern Bothinian Sea to the Archipelago Sea and the western Gulf of Finland CW B126-22Shelteredshallow-Sites in the Gulf of Riga, the Southern Swedish coast and the Southeastern Baltic Sea coast along Denmark and Germany CW B136-22Exposedshallow-Sites along the coast of the Estonia, Latvia and Lithuania, the Polish coast and the Danish island “Bornholm” CW B 146-22ShelteredShallow-Lagoons TW B 136-22ExposedshallowTransitional water. Sites along the coast of Lithuania and Poland

3. Countries sharing types that have been intercalibrated Type DEDKEEFILiLVPLSE CW B0XX CW B2XX CW B3XX CW B12XXXX CW B13XXXXX CW B14XX TW B 13XX

4. CountryAssessment Method All countriesChlorofyll a µg/l (Summer mean, May/June – September) Type and countryEcological Quality Ratios for the national classification systems Parameter values/ranges Chlorophyll a µg/l High-Good boundaryGood-Moderate boundary High-Good boundaryGood-Moderate boundary CW B0 Finland and Sweden0.760.56 1.7 (1.5 – 1.8)2.3 (2.0 -2.7) CW B2 Finland and Sweden 0.780.561.82.5 (2.3 -2.6) CW B3 Eastern part CW B3 Western part 0.71 0.81 0.49 0.68 2.4 (2.2 - 2.6) 1.6 3.5 (2.9 – 4.0) 1.9 CW B 12 Eastern Baltic Sea 5-8 psu Estonia CW B 12 Western Baltic Sea 8 -22 psu Denmark, Germany and Sweden 0.82 0.92 0.66 0.63 2,2 1.3 (1.1 – 1.5) 2.7 1.9 CW B 13 Denmark, Estonia and Latvia* 0.920.751.31.6 CW B 14 Denmark 0.820.561.11.6 TW B 13 Poland and Lithuania 0.900.664.25.8 LV has adopted the assessment made by Estonia. The sites in Estonia and in Latvia are very similar (expert judgement). LV has not developed their own assessment system and has no data from the intercalibration site.

5. Type and countryEcological Quality Ratios for the national classification systems Parameter values/ranges High-Good boundary Good-Moderate boundary High/-Good boundary Good-Moderate boundary CW B0 Finland Sweden 0.99 0.77 0.59 0.31 CW B2 Finland Sweden 0.95 0.77 0.57 0.31 CW B3 middle Finland Sweden CW B3 outer Finland Sweden 0.89 0.77 0.90 0.77 0.53 0.31 0.54 0.31 CW B 12 Denmark Sweden Germany 0.69 0.78 0.80 0.37 0.35 0.60 Biological Quality ElementBenthic fauna The EQR – scales are different, but the level of protection is shown to be the same for FI and SE, DK and SE, SE and DE.

6. Type and country Ecological Quality Ratios for the national classification systems Parameter values/ranges Depth limit (m) Eelgrass Zostera marina High-Good boundary Good- Moderate boundary High/-Good boundary Good- Moderate boundary CW B 12 Denmark and Germany Open coast CW B 12 Denmark, and Germany Bays 0.90 0.94 0.74 0.70 8.5 (8.0 – 9.4) 6.7 7 (6.6 – 7.1) 5 (4.7 – 5) Depth limit Zostera marina

7. 5 (4-5)7 (5-8) CW B3 All countries 56 (6-7) CW B2 All countries 45 (5-6) CW B0 All countries Good-Moderate boundary High/-Good boundary Good-Moderate boundary High-Good boundary Ecological Quality Ratios for the national classification systems BoundaryType and country MacroalgaeBiological Quality Element The EQR – scales are different, but the level of protection is shown to be the same for FI and SE, DK and SE, SE and DE. 0.80 0.71-0.86 0.62 0.57-0.66 0.82 0.77-0.85 0.79 0.75-0.83 0.63 0.55-0.71 0.58 0.50-0.66