Fig. 1
Station locations map where major rivers are shown with larger font letters. The main course of the river is shown as a dark line while tributaries are shown in grey.
Table 1. Annual mean discharge, salinity, oxygen saturation, ammonium, N2O concentration, saturation, flux and nitrification rates. In the Indian estuaries. Nitrification rates were given only for the dry period
[i] aDischarge data were obtained from Sarma et al. (2012).
Fig. 2
Relationship between river discharge and dissolved inorganic nitrogen (DIN) during the wet period in the Indian estuaries.
Fig. 3
Relationship of N2O saturation with (a) salinity, (b) dissolved oxygen saturation (DOsat;%), (c) ammonium concentration (µM) and (d) dissolved inorganic nitrogen (DIN; µM). The points circled in (b) and (d) were excluded in constructing the regression equation, which comes from the polluted estuaries, Narmada and Mahisagar.
Fig. 4
Relationship of N2O saturation with salinity, dissolved oxygen saturation and ammonium in selected estuaries.