Atmospheric nitrogen depositions to the Baltic Sea in the period - PowerPoint PPT Presentation

Atmospheric nitrogen depositions to the Baltic Sea in the period 1995-2016 Michael Gauss, Jerzy Bartnicki and Heiko Klein EMEP MSC-W

Key message ● Annual depositions of oxidised, reduced and total nitrogen were, respectively, 42% and 11% and 31% lower in 2016 than in 1995. ● There is a clear decreasing trend in normalised annual total deposition of nitrogen which is consistent with the decreasing trend in nitrogen emissions from the HELCOM area. ● Compared to 1995, normalised depositions of oxidised, reduced and total nitrogen in 2016 were, respectively, 38%, 16% and 29% lower.

Atmospheric deposition of oxidised, reduced and total nitrogen to the Baltic Sea basin. Period 1995-2016, in percent of 1995 values.

Normalised deposition of total nitrogen in the period 1995-2016

Nitrogen deposition to sub-basins for the period 1995-2016

Note on precision in BSEFS: Precise data: Reduced N deposition to SOU in 1995: 1.29 kt(N)/yr Reduced N deposition to SOU in 2016: 1.20 kt(N)/yr  Reduction is 6.98%  in the text we write “7%” In the BSEFS only one decimal is retained: Reduced N deposition to SOU in 1995: 1.3 kt(N)/yr Reduced N deposition to SOU in 2016: 1.2 kt(N)/yr  Reduction is 7.69%  should we write “8%”?