A radon-only technique for characterising baseline constituent concentrations at Cape Grim

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dc.contributor.authorChambers, SDen_AU
dc.contributor.authorWilliams, AGen_AU
dc.contributor.authorCrawford, Jen_AU
dc.contributor.authorGriffiths, ADen_AU
dc.contributor.authorKrummel, PBen_AU
dc.contributor.authorSteele, LPen_AU
dc.contributor.authorSchoot, VDen_AU
dc.date.accessioned2017-02-10T00:15:16Zen_AU
dc.date.available2017-02-10T00:15:16Zen_AU
dc.date.issued2014-11-12en_AU
dc.date.statistics2017-02-10en_AU
dc.description.abstractNine years (2004-2013) of hourly Radon-222, carbon dioxide and ozone concentration observations at Cape Grim are used to assess the residual terrestrial influence on air masses with radon concentrations below the 100 mBq m-3 threshold traditionally used for ‘baseline’ delineation (Figure 1a). Subsequently, a two step radon-only approach for estimating ‘baseline’ constituent concentrations on monthly timescales is proposed. Based on a stringent 40mBq m-3 radon threshold followed by a simple 10th/90th percentile constitute outlier removal, the technique is completely independent of meteorological or aerosol observations. An initial evaluation of the techniqueusing hourly carbon dioxide and ozone records yielded monthly ‘baseline’ concentration estimates more consistent with expectations of minimally perturbed Southern Ocean air masses than existing baseline selection techniques (Figure 1c). This work builds upon prior studies that have identified radon as a valuable baseline criteria [e.g Gras and Whittlestone, 1992; Molly and Galbally, 2014]. CSIRO Oceans and Atmosphere Flagship Aspendale, Victoria, Australia.en_AU
dc.identifier.citationChambers, S. D., Williams, A., Crawford, J., Griffiths, A. D., Krummel, P. B., Steele, L. P., & Schoot, V. D. (2014). A Radon-only technique for characterising baseline constituent concentrations at Cape Grim. Paper presented at Atmospheric Composition and Chemistry Observations and Modelling Conference incorporating the Cape Grim Annual Science Meeting, 12-13 November 2014, Aspendale, Victoria.en_AU
dc.identifier.conferenceenddate3 November 2014en_AU
dc.identifier.conferencenameAtmospheric Composition and Chemistry Observations and Modelling Conference incorporating the Cape Grim Annual Science Meetingen_AU
dc.identifier.conferenceplaceAspendale, Victoriaen_AU
dc.identifier.conferencestartdate12 November 2014en_AU
dc.identifier.govdoc7849en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8283en_AU
dc.language.isoenen_AU
dc.publisherBureau of Meteorology and CSIRO Oceans and Atmosphere Flagshipen_AU
dc.subjectCarbon dioxideen_AU
dc.subjectRadon 222en_AU
dc.subjectAerosol monitoringen_AU
dc.subjectBasesen_AU
dc.subjectConcentration ratioen_AU
dc.subjectAiren_AU
dc.titleA radon-only technique for characterising baseline constituent concentrations at Cape Grimen_AU
dc.typeConference Abstracten_AU
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