Simulations of atmospheric methane for Cape Grim, Tasmania, to constrain southeastern Australian methane emissions

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dc.contributor.authorLoh, ZHen_AU
dc.contributor.authorLaw, RMen_AU
dc.contributor.authorHaynes, KDen_AU
dc.contributor.authorKrummel, PBen_AU
dc.contributor.authorSteele, LPen_AU
dc.contributor.authorFraser, PJen_AU
dc.contributor.authorChambers, SDen_AU
dc.contributor.authorWilliams, AGen_AU
dc.date.accessioned2016-09-15T01:40:25Zen_AU
dc.date.available2016-09-15T01:40:25Zen_AU
dc.date.issued2014-01-13en_AU
dc.date.statistics2016-09-15en_AU
dc.description.abstractThis study uses two climate models and six scenarios of prescribed methane emissions to compare modelled and observed atmospheric methane between 1994 and 2007, for Cape Grim, Australia (40.7° S, 144.7° E). The model simulations follow the TransCom-CH4 protocol and use the Australian Community Climate and Earth System Simulator (ACCESS) and the CSIRO Conformal-Cubic Atmospheric Model (CCAM). Radon is also simulated and used to reduce the impact of transport differences between the models and observations. Comparisons are made for air samples that have traversed the Australian continent. All six emission scenarios give modelled concentrations that are broadly consistent with those observed. There are three notable mismatches, however. Firstly, scenarios that incorporate interannually varying biomass burning emissions produce anomalously high methane concentrations at Cape Grim at times of large fire events in southeastern Australia, most likely due to the fire methane emissions being unrealistically input into the lowest model level. Secondly, scenarios with wetland methane emissions in the austral winter overestimate methane concentrations at Cape Grim during wintertime while scenarios without winter wetland emissions perform better. Finally, all scenarios fail to represent a~methane source in austral spring implied by the observations. It is possible that the timing of wetland emissions in the scenarios is incorrect with recent satellite measurements suggesting an austral spring (September–October–November), rather than winter, maximum for wetland emissions. © Author(s) 2015. Creative Commons Attribution 3.0 Licenceen_AU
dc.identifier.citationLoh, Z. M., Law, R. M., Haynes, K. D., Krummel, P. B., Steele, L. P., Fraser, P. J., Chambers, D. D., Williams, A. G. (2014). Simulations of atmospheric methane for Cape Grim, Tasmania, to constrain South East Australian methane emissions. Atmospheric Chemistry and Physics, 15(1), 305-317. doi:10.5194/acp-15-305-2015en_AU
dc.identifier.govdoc7103en_AU
dc.identifier.issn1680-7316en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleAtmospheric Chemistry and Physicsen_AU
dc.identifier.pagination305-317en_AU
dc.identifier.urihttp://dx.doi.org/10.5194/acp-15-305-2015en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/7521en_AU
dc.identifier.volume15en_AU
dc.language.isoenen_AU
dc.publisherCopernicus Publicationsen_AU
dc.subjectClimate modelsen_AU
dc.subjectEmissions tradingen_AU
dc.subjectAtmospheresen_AU
dc.subjectAustraliaen_AU
dc.subjectMethaneen_AU
dc.subjectWetlandsen_AU
dc.titleSimulations of atmospheric methane for Cape Grim, Tasmania, to constrain southeastern Australian methane emissionsen_AU
dc.typeJournal Articleen_AU
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