Your browser doesn't support javascript.
loading
Effects of an Experimental Water-level Drawdown on Methane Emissions from a Eutrophic Reservoir.
Beaulieu, Jake J; Balz, David A; Birchfield, M Keith; Harrison, John A; Nietch, Christopher T; Platz, Michelle C; Squier, William C; Waldo, Sarah; Walker, John T; White, Karen M; Young, Jade L.
Afiliação
  • Beaulieu JJ; 1National Risk Management Research Laboratory, United States Environmental Protection Agency, Office of Research and Development, 26 W Martin Luther King Dr, Cincinnati, Ohio 45268 USA.
  • Balz DA; Pegasus Technical Services, Cincinnati, Ohio USA.
  • Birchfield MK; 3School of the Environment, Washington State University, Vancouver, Washington USA.
  • Harrison JA; 3School of the Environment, Washington State University, Vancouver, Washington USA.
  • Nietch CT; 1National Risk Management Research Laboratory, United States Environmental Protection Agency, Office of Research and Development, 26 W Martin Luther King Dr, Cincinnati, Ohio 45268 USA.
  • Platz MC; 1National Risk Management Research Laboratory, United States Environmental Protection Agency, Office of Research and Development, 26 W Martin Luther King Dr, Cincinnati, Ohio 45268 USA.
  • Squier WC; 4National Enforcement Investigations Center, United States Environmental Protection Agency, Denver, Colorado USA.
  • Waldo S; 1National Risk Management Research Laboratory, United States Environmental Protection Agency, Office of Research and Development, 26 W Martin Luther King Dr, Cincinnati, Ohio 45268 USA.
  • Walker JT; 5National Risk Management Research Laboratory, United States Environmental Protection Agency, Office of Research and Development, Durham, North Carolina USA.
  • White KM; 1National Risk Management Research Laboratory, United States Environmental Protection Agency, Office of Research and Development, 26 W Martin Luther King Dr, Cincinnati, Ohio 45268 USA.
  • Young JL; 6United States Army Corps of Engineers, Louisville, Kentucky USA.
Ecosystems ; 21(4): 657-674, 2018.
Article em En | MEDLINE | ID: mdl-31007569
ABSTRACT
Reservoirs are a globally significant source of methane (CH4) to the atmosphere. However, emission rate estimates may be biased low due to inadequate monitoring during brief periods of elevated emission rates (that is, hot moments). Here we investigate CH4 bubbling (that is, ebullition) during periods of falling water levels in a eutrophic reservoir in the Midwestern USA. We hypothesized that periods of water-level decline trigger the release of CH4-rich bubbles from the sediments and that these emissions constitute a substantial fraction of the annual CH4 flux. We explored this hypothesis by monitoring CH4 ebullition in a eutrophic reservoir over a 7-month period, which included an experimental water-level drawdown. We found that the ebullitive CH4 flux rate was among the highest ever reported for a reservoir (mean = 32.3 mg CH4 m-2 h-1). The already high ebullitive flux rates increased by factors of 1.4-77 across the nine monitoring sites during the 24-h experimental water-level drawdown, but these emissions constituted only 3% of the CH4 flux during the 7-month monitoring period due to the naturally high ebullitive CH4 flux rates that persist throughout the warm weather season. Although drawdown emissions were found to be a minor component of annual CH4 emissions in this reservoir, our findings demonstrate a link between water-level change and CH4 ebullition, suggesting that CH4 emissions may be mitigated through water-level management in some reservoirs.
Palavras-chave

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article