Using atmospheric 14CO to provide additional constraints for global OH: first results from a new approach and potential for future measurements

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dc.contributor.authorPetrenko, VVen_AU
dc.contributor.authorMurray, LTen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorCrosier, EMen_AU
dc.contributor.authorColton, Aen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorYang, Ben_AU
dc.contributor.authorKazemi, Ren_AU
dc.contributor.authorUsoskin, IGen_AU
dc.contributor.authorPoluianov, Sen_AU
dc.date.accessioned2024-01-11T01:00:18Zen_AU
dc.date.available2024-01-11T01:00:18Zen_AU
dc.date.issued2018-12-13en_AU
dc.date.statistics2023-02-23en_AU
dc.description.abstractThe primary source of 14C-containing carbon monoxide (14CO) in the atmosphere is via 14C production from 14N by secondary cosmic rays, and the primary sink is removal by hydroxyl radicals (OH). Variations in the global abundance of 14CO that are not explained by variations in 14C production are mainly driven by variations in the global abundance of OH. Monitoring OH variability via methyl chloroform is becoming increasingly difficult as methyl chloroform abundance is continuing to decline. Measurements of atmospheric 14CO have previously been successfully used to infer OH variability. However, these measurements are currently only continuing at one location (Baring Head, New Zealand), which is insufficient to infer global trends. We propose to restart global 14CO monitoring with the aim of providing an additional constraint on OH variability. A new analytical system for 14CO sampling and measurements has been developed, allowing for a ten-fold reduction in the required sample air volumes and simplified field logistics. The first 14CO measurements from Mauna Loa Observatory show good agreement with prior measurements in the same latitude band. Preliminary work with a state-of-the-art chemical transport model is exploring sensitivity of 14CO at potential sampling locations to changes in production rates and OH.en_AU
dc.identifier.citationPetrenko, V. V., Murray, L. T., Smith, A. M., Crosier, E., Colton, A., Hua, Q., Yang, B., Kazemi, R., Usoskin, I. G., & Poluianov, S. (2018). Using atmospheric 14CO to provide additional constraints for global OH: first results from a new approach and potential for future measurements. Paper presented at the AGU Fall Meeting, Washington, D. C., 10 to 14 December 2018. Retrieved from: https://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/420567en_AU
dc.identifier.conferenceenddate2018-12-14en_AU
dc.identifier.conferencenameAGU Fall Meeting 2018en_AU
dc.identifier.conferenceplaceWashington, D. C.en_AU
dc.identifier.conferencestartdate2018-12-10en_AU
dc.identifier.otherA43M-3279en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/420567en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15308en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectCarbon dioxideen_AU
dc.subjectCarbon 14en_AU
dc.subjectSamplingen_AU
dc.subjectDataen_AU
dc.subjectChloroformen_AU
dc.subjectNew Zealanden_AU
dc.subjectEarth atmosphereen_AU
dc.titleUsing atmospheric 14CO to provide additional constraints for global OH: first results from a new approach and potential for future measurementsen_AU
dc.typeConference Paperen_AU
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