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North SEA data overview

North SEA data overview. Available data. 957040 datasets 457 parameters with a number of different methods. nutrients. Analytical methods NH4: 17 methods NO2, NO23: 14; NO3: 22 methods TN: 10 methods PO4: 28 methods TP: 10 methods Chlorophyll -a: 7 methods

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North SEA data overview

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  1. North SEA data overview

  2. Available data 957040 datasets 457 parameters with a numberof different methods

  3. nutrients • Analyticalmethods • NH4: 17 methods • NO2, NO23: 14; NO3: 22 methods • TN: 10 methods • PO4: 28 methods • TP: 10 methods • Chlorophyll-a: 7 methods • Verification of results • OP>TP in 180 cases (<0.1%) • NOx+NH4 > TN in xx cases • Chlorophyll-a: Scatterplot ok

  4. Hazardoussubstances • Metals in water (surfaceonly 0- 1 m depth) • Cu 0.2 – 24 µg/l (mean 3); 220 samples onlysurface • Pb 0.007 – 13 µg/l (mean 1.1); 412 samples • Cd 0.003 – 0.324 µg/l (mean 0.05); 152 samples • Hg 1 – 180 ng/l (mean 15); 138 samples • Selectedorganicsubstances in water • HCH’s 0.007- 15 ng/l (mean 1.1); 336 samples (Ireland, UK, NL, Germany) • DDT’s 0.1 – 0.6 ng/l (mean 0.88); 311 samples • HCB 0.0001 – 10 ng/l (mean 0.091); 302 samples • CB118 0.02 – 0.5 ng/l (mean 0.24); 196 samples (NL, Germany) • PAHs 0.003 – 8.02 ng/l (mean 0.23); 78 samples (Germany) • TBT 0.5 – 0.7 ng/l (mean 0.5); 11 samples from Ireland

  5. Extent of metals (Pb)

  6. Organics (HCH) extent of data

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