Area | Study period | Primary Production | Author(s) |
---|---|---|---|
Kattegat | 1954–1960 | 97.5 | |
1964–1969 | 90.4 | ||
1988–1990 | 290 | ||
Belt Sea | 1953–1957 | 86 | |
1975–1977 | 116.5 | ||
Belt Sea – Sound | 1972 | 70–77 | |
1973 | 73–183 | ||
Belt Sea – Kiel Bight | 1971–1793 | 158 | |
Bornholm Basin – Arkona Deep | 1971–1974 | 85 | |
1967–1978 | 94.3 | ||
Bornholm Basin – Mecklenburg Bight | 1969–1978 | 130 | |
Bornholm Basin – Bornholm Deep | 1967–1972 | 59–138 | |
1971–1975 | 95 | ||
1987–1991 | 123 | ||
Gulf of Gdansk | 1971–1974 | 140 | |
1987 | 304 | ||
2004–2013 | 138–285 | unpublished data, NMFRI | |
average: 229 | |||
Gulf of Gdańsk – Puck Bay | 1965–1991 | 198 | |
Gulf of Gdańsk – Gdansk Deep | 1971–1974 | 107 | |
1981–1985 | 129 | ||
1987–1991 | 172 | ||
Gotlańd Basin – Gotlańd Deep | 1970 | 38 | |
1973 | 91 | ||
1974 | 116 | ||
1987–1991 | 141 | ||
Aland Sea | 1974–1976 | 66–94 | |
Bothnian Bay | 1973–1974 | 18–70 | |
Gulf of Finland | 1967–1971 | 30–65 | |
78 | |||
Gulf of Finland – Helsinki area | 1968 | 150–200 |
Country | |||||||
---|---|---|---|---|---|---|---|
CARTTN [tons yr-1] | CART TP [tons yr-1] | Percentage contribution | Region | TP [tons yr-1] | TN [tons yr-1] | ||
TN | TP | ||||||
Denmark | 2890 | 38 | 3.24 | 0.26 | Bothnian Sea | Not needed | Reduction not recommended by the authors |
Germany | 7670 | 170 | 8.59 | 1.18 | |||
Poland | 43 610 | 7480 | 48.86 | 52.04 | Bothnian Bay | Not needed | |
Lithuania | 8970 | 1470 | 10.05 | 10.23 | |||
Latvia | 1670 | 220 | 1.87 | 1.53 | Gulf of Finland | 3180 | |
Estonia | 1800 | 320 | 2.02 | 2.23 | |||
Russia | 10 380 | 3790 | 11.63 | 26.36 | Gulf of Riga | 550 | |
Finland | 3030 | 356 | 3.39 | 2.48 | |||
Sweden | 9240 | 530 | 10.35 | 3.69 | Baltic Proper | 5000 | |
Area | Study period | |||
---|---|---|---|---|
1971–1974 | 1981–1985 | 1987–1991 | 1994–1998 | |
Gulf of Gdańsk (average value) | 140 | 156 | ||
Gulf of Gdańsk (Gdansk Deep) | 107 | 129 | 172 | 190 |
Bornholm Basin (Bornholm Deep) | 82 | 91 | 123 | 164 |
Gotland Basin (Gotland Deep) | 92 | 116 | 141 | 140 |
Słupsk Furrow | 88 | 103 |
Nitrogen, phosphorus loads | In 1997–2003 | In 2012–2014 | Difference between 1997–2003 and 2012–2014 | Maximal observed (years in brackets) | Difference between max. observed and 2012–2014 | BSAP Poland |
---|---|---|---|---|---|---|
tons yr-1 | ||||||
TN | 169648 | 140 372 | 29 276 | 209 243 (1992–1994) | 68 871 | 43 610 |
TP | 11 548 | 8990 | 2558 | 14 903 (1988–1991) | 5913 | 7480 |
Trophic state | Håkanson and Bryhn (2008) | |||||
---|---|---|---|---|---|---|
Secchi depth | Chl- |
TN | TP | Cyanobacteria | Organic carbon supply | |
m | μg l-1 | μg wm l-1 | g C m-2 yr-1 | |||
Oligotrophic | > 8 | < 2 | < 70 | < 10 | < 9.5 | < 100 |
Mesotrophic | 4.5–8 | 2–6 | 70–220 | 10–30 | 9.5–380 | 100–300 |
Eutrophic | 1.5–4.5 | 6–20 | 220–650 | 30–90 | 380–2500 | 301–500 |
Hypertrophic | < 1.5 | > 20 | > 650 | > 90 | > 2500 | > 500 |
Average flow normalized TN loads | Average flow normalized TP loads | Target CART and max allowable WFD concentrations TN | Target CART and max allowable WFD concentrations TP | Target CART and max allowable WFD concentrations TN | Target CART and max allowable WFD concentrations TP |
---|---|---|---|---|---|
Vistula + Oder + other rivers | Vist | Oder | |||
tons N yr-1 | tons P yr-1 | mg dm-3 | |||
94 794 + 57 220 + 17 634 = 169 648 | 6250+4116+1182= 11 548 | 2.06 target TN concentrations could be slightly lower if we took into account the reduction of direct atmospheric deposition to the Baltic Sea by Poland; |
0.067 ( |
2.57 target TN concentrations could be slightly lower if we took into account the reduction of direct atmospheric deposition to the Baltic Sea by Poland; |
0.083 ( |