title: Do lagoons near concentrated animal feeding operations promote nitrous oxide supersaturation?
abstract: Animal wastewater lagoons nearby concentrated animal feeding operations (CAFOs) represent the latest tendency in global animal farming, severely impacting the magnitude of greenhouse gas emissions, including nitrous oxide (N(2)O). We hypothesized that lagoon wastewater could be supersaturated with N(2)O as part of incomplete microbial nitrification/denitrification processes, thereby regulating the N(2)O partitioning in the gaseous phase. The objectives of this study were: (i) to investigate the magnitude of dissolved N(2)O concentrations in the lagoon; and (ii) to determine the extent to which supersaturation of N(2)O occurs in wastewater lagoons. Dissolved N(2)O concentrations in the wastewater samples were high, ranging from 0.4 to 40.5 microg N(2)O mL(-1). Calculated dissolved N(2)O concentrations from the experimentally measured partition coefficients were much greater than those typically expected in aquatic systems (< approximately 0.6 microg N(2)O mL(-1)). Knowledge of the factors controlling the magnitude of N(2)O supersaturation could potentially bridge mass balance differences between in situ measurements and global N(2)O models.
authors.affiliation: Cyprus International Institute for the Environment and Public Health in association with the Harvard School of Public Health, 5 Iroon Street, 1105 Nicosia, Cyprus. kcmakris@gmail.com
authors.forename: Konstantinos C
authors.initials: KC
authors.lastname: Makris
authors.forename: Dibyendu
authors.initials: D
authors.lastname: Sarkar
authors.forename: Syam S
authors.initials: SS
authors.lastname: Andra
authors.forename: Stephan B H
authors.initials: SB
authors.lastname: Bach
authors.forename: Rupali
authors.initials: R
authors.lastname: Datta
mesh_terms: D000397:Air Pollution; D000822:Animal Husbandry / Q000379:methods*; D000818:Animals; D004463:Ecology / Q000379:methods; D017752:Greenhouse Effect; D009609:Nitrous Oxide / Q000032:analysis*; D009657:North Carolina; D013552:Swine; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D009609:Nitrous Oxide