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- W112664513 abstract "Nitrous oxide (N2O), the third most important greenhouse gas in terms of anthropogenic climate forcing, is also one of the most important trace gases in driving atmospheric chemistry. It is a potent greenhouse gas, having a global warming potential per mole about 300 times that of carbon dioxide, and it is an intermediate in the destruction of stratospheric ozone. Unfortunately, the N2O global budget, and in particular the cause of its steady rise over the past century, is not well defined. The natural and anthropogenic sources for its increase are probably not all identified and certainly not well quantified. Recent studies show that when estuarine and coastal regions are included in the global N2O budget, a considerable portion of the global marine N2O flux is from estuarine and coastal regions, mainly due to high emissions from estuaries. To examine the contribution of estuaries to N2O emissions, nitrous oxide concentrations in the water were measured by gas chromatography on a monthly basis in the River Itchen and Itchen Estuary - UK, from November 2001 to December 2002. Water column concentrations of N2O in both, river and estuary were supersaturated with respect to air (mean saturation 325% and 162%, respectively), indicating that they were sources of N2O to the atmosphere. High N2O concentrations in the river appear related to high concentrations in the groundwater. Highest N2O concentrations in the estuary were generally observed at lower salinities (up to 79nM and saturation = 679%) when compared with concentrations at the high salinity (average saturation = 87%). Nitrite had the strongest correlation with N2O for all surveys (r=0.78; p production in estuaries. Fluxes from the River Itchen and Itchen Estuary extrapolated to the UK systems and compared with other anthropogenic sources of nitrous oxide to the atmosphere, showed that these systems are significant sources and should be included in the N2O budget. Incubation experiments were done with sediment collected from the Itchen Estuary to investigate N2O production. Initial experiments on a whole core showed the importance of temperature on N2O production, and also the potentially complicating impact of biological activity. In subsequent experiments, homogenized and sieved sediment material were used, in which macro benthos were excluded. N2O fluxes from the sediment were estimated and denitrification was suggested as the main process producing N2O in the sediments of the incubated cores." @default.
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- W112664513 date "2007-06-01" @default.
- W112664513 modified "2023-09-27" @default.
- W112664513 title "Studies of nitrous oxide and the nitrogen cycle in a temperateriver-estuarine system" @default.
- W112664513 hasPublicationYear "2007" @default.
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