Fig. 3.

Schematic of Baltic Sea N and P cycling in the basin and at coastal river-impacted sites. Yellow arrows indicate denitrification/anammox processes at the redoxcline and in coastal sediments. The red arrows indicate the other pathway, which leads to ammonium release and accumulation. Black numbers are estimates of nitrogen and phosphorus sources and sinks (references for the different fluxes are (1) Voss et al. 2011; (2) Wasmund et al. 2001; (3) Dalsgaard et al. 2013; (4) Gustafsson et al. 2012; (5) Mort et al. 2010)