Fig. 3.

Relationships between NANI and riverine TN fluxes (a) and between NAPI and riverine TP fluxes (b) in seven regions of Baltic Sea catchments. NANI and NAPI are calculated with spatially uniform parameters. Open circles represent regional averages calculated from all watersheds with estimates of riverine TN and TP fluxes (107 watersheds); plus symbols from monitored watersheds only (78 watersheds). BB Bothnian Bay, BS Bothnian Sea, GF Gulf of Finland, GR Gulf of Riga, KT Kattegat, BP Baltic Proper, and DS Danish Straits. No monitored data were available in the DS region. Only the KT region showed a substantial difference between all watersheds and monitored watersheds only, and is thus separately labeled as “KT(a)” and “KT(m),” respectively