Methane and nitrous oxide emissions from a subtropical coastal embayment (Moreton Bay, Australia)

Musenze, Ronald S., Werner, Ursula, Grinham, Alistair, Udy, James and Yuan, Zhiguo (2015) Methane and nitrous oxide emissions from a subtropical coastal embayment (Moreton Bay, Australia). Journal of Environmental Sciences, 29 82-96. doi:10.1016/j.jes.2014.06.049


Author Musenze, Ronald S.
Werner, Ursula
Grinham, Alistair
Udy, James
Yuan, Zhiguo
Title Methane and nitrous oxide emissions from a subtropical coastal embayment (Moreton Bay, Australia)
Journal name Journal of Environmental Sciences   Check publisher's open access policy
ISSN 1001-0742
1878-7320
Publication date 2015-03-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.jes.2014.06.049
Volume 29
Start page 82
End page 96
Total pages 15
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Formatted abstract
Surface water methane (CH4) and nitrous oxide (N2O) concentrations and fluxes were investigated in two subtropical coastal embayments (Bramble Bay and Deception Bay, which are part of the greater Moreton Bay, Australia). Measurements were done at 23 stations in seven campaigns covering different seasons during 2010–2012. Water–air fluxes were estimated using the Thin Boundary Layer approach with a combination of wind and currents-based models for the estimation of the gas transfer velocities. The two bays were strong sources of both CH4 and N2O with no significant differences in the degree of saturation of both gases between them during all measurement campaigns. Both CH4 and N2O concentrations had strong temporal but minimal spatial variability in both bays. During the seven seasons, CH4 varied between 500% and 4000% saturation while N2O varied between 128 and 255% in the two bays. Average seasonal CH4 fluxes for the two bays varied between 0.5 ± 0.2 and 6.0 ± 1.5 mg CH4/(m2·day) while N2O varied between 0.4 ± 0.1 and 1.6 ± 0.6 mg N2O/(m2·day). Weighted emissions (t CO2-e) were 63%–90% N2O dominated implying that a reduction in N2O inputs and/or nitrogen availability in the bays may significantly reduce the bays' greenhouse gas (GHG) budget. Emissions data for tropical and subtropical systems is still scarce. This work found subtropical bays to be significant aquatic sources of both CH4 and N2O and puts the estimated fluxes into the global context with measurements done from other climatic regions.
Keyword Greenhouse gas emissions
Subtropical aquatic systems
Bay
Methane
Nitrous oxide
Uncertainty
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2015 Collection
Advanced Water Management Centre Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 02 Jan 2015, 05:00:42 EST by Dr Alistair Grinham on behalf of School of Civil Engineering