A radon-only technique for characterising baseline constituent concentrations at Cape Grim
Nine 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). Subseq...
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ftansto:oai:apo-prod.ansto.gov.au:10238/8283 2023-05-15T18:25:23+02:00 A radon-only technique for characterising baseline constituent concentrations at Cape Grim Chambers, SD Williams, A Crawford, J Griffiths, AD Krummel, PB Steele, LP Schoot, VD 2017-02-10 http://apo.ansto.gov.au/dspace/handle/10238/8283 en eng Bureau of Meteorology and CSIRO Oceans and Atmosphere Flagship Chambers, S. D., Williams, A., Crawford, J., Griffiths, A. D., Krummel, P. B., Steele, L. P., & Schoot, V. D. (12-14 November, 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. http://apo.ansto.gov.au/dspace/handle/10238/8283 Carbon dioxide Radon 222 Aerosol monitoring Bases Concentration ratio Air Conference Abstract 2017 ftansto 2020-08-17T22:28:26Z Nine 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. Conference Object Southern Ocean Australian Nuclear Science and Technology Organisation: ANSTO Publications Online Grim ENVELOPE(-64.486,-64.486,-65.379,-65.379) Southern Ocean |
institution |
Open Polar |
collection |
Australian Nuclear Science and Technology Organisation: ANSTO Publications Online |
op_collection_id |
ftansto |
language |
English |
topic |
Carbon dioxide Radon 222 Aerosol monitoring Bases Concentration ratio Air |
spellingShingle |
Carbon dioxide Radon 222 Aerosol monitoring Bases Concentration ratio Air Chambers, SD Williams, A Crawford, J Griffiths, AD Krummel, PB Steele, LP Schoot, VD A radon-only technique for characterising baseline constituent concentrations at Cape Grim |
topic_facet |
Carbon dioxide Radon 222 Aerosol monitoring Bases Concentration ratio Air |
description |
Nine 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. |
format |
Conference Object |
author |
Chambers, SD Williams, A Crawford, J Griffiths, AD Krummel, PB Steele, LP Schoot, VD |
author_facet |
Chambers, SD Williams, A Crawford, J Griffiths, AD Krummel, PB Steele, LP Schoot, VD |
author_sort |
Chambers, SD |
title |
A radon-only technique for characterising baseline constituent concentrations at Cape Grim |
title_short |
A radon-only technique for characterising baseline constituent concentrations at Cape Grim |
title_full |
A radon-only technique for characterising baseline constituent concentrations at Cape Grim |
title_fullStr |
A radon-only technique for characterising baseline constituent concentrations at Cape Grim |
title_full_unstemmed |
A radon-only technique for characterising baseline constituent concentrations at Cape Grim |
title_sort |
radon-only technique for characterising baseline constituent concentrations at cape grim |
publisher |
Bureau of Meteorology and CSIRO Oceans and Atmosphere Flagship |
publishDate |
2017 |
url |
http://apo.ansto.gov.au/dspace/handle/10238/8283 |
long_lat |
ENVELOPE(-64.486,-64.486,-65.379,-65.379) |
geographic |
Grim Southern Ocean |
geographic_facet |
Grim Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Chambers, S. D., Williams, A., Crawford, J., Griffiths, A. D., Krummel, P. B., Steele, L. P., & Schoot, V. D. (12-14 November, 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. http://apo.ansto.gov.au/dspace/handle/10238/8283 |
_version_ |
1766206806496903168 |