| Concentrations of nitrous oxide (N<sub>2</sub>O), oxygen, nitrate, and ammonium, as well as nitrification activity were determined along the salinity gradient of the Schelde Estuary, Northwest Europe, in October 1993, March 1994, and July 1996, The entire estuary was always supersaturated with N<sub>2</sub>O. Concentrations ranged from 338 nmol dm<sup>-3</sup> (31 times supersaturated) in the O<sub>2</sub>-poor upper estuary, down to about 10 nmol dm<sup>-3</sup> (slight supersaturation) at the mouth of the estuary. Nearly all N<sub>2</sub>O was lost to the atmosphere within the estuary rather than being transported to the open sea. The mean annual emission from the Schelde estuary to... |
