Using atmospheric 14CO to provide additional constraints for global OH: 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.authorCrosier, EMen_AU
dc.contributor.authorColton, Aen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorYang, Ben_AU
dc.contributor.authorKazemi, Ren_AU
dc.contributor.authorNeff, PDen_AU
dc.contributor.authorEtheridge, DMen_AU
dc.contributor.authorUsoskin, IGen_AU
dc.contributor.authorPoluianov, Sen_AU
dc.date.accessioned2024-01-17T05:45:20Zen_AU
dc.date.available2024-01-17T05:45:20Zen_AU
dc.date.issued2019-04-10en_AU
dc.date.statistics2023-03-24en_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 have only continued 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. This presentation will also provide an update on a project which aims to improve the understanding of long-term OH variability via reconstructing a 150-year history of atmospheric 14CO from ice cores at Law Dome, Antarctica. Sampling of the ice and on-site extractions of large volumes of ancient air were in progress during December 2018 – January 2019. © Author(s) 2019. CC Attribution 4.0 licenseen_AU
dc.identifier.citationPetrenko, V., Murray, L., Smith, A., Crosier, E., Colton, A., Hua, Q., Yang, B., Kazemi, R., Neff, P., Etheridge, D., Usoskin, I., & Poluianov, S. (2019). Using atmospheric 14CO to provide additional constraints for global OH: results from a new approach and potential for future measurements. Paper presented to the EGU General Assembly 2019, Vienna, Austria, 7-12 April 2019. In Geophysical Research Abstracts, Vol. 21, EGU2019-8524. Retrieved from: https://meetingorganizer.copernicus.org/EGU2019/EGU2019-8524.pdfen_AU
dc.identifier.conferenceenddate2019-04-12en_AU
dc.identifier.conferencenameEGU General Assembly 2019en_AU
dc.identifier.conferenceplaceVienna, Austria.en_AU
dc.identifier.conferencestartdate2019-04-07en_AU
dc.identifier.journaltitleGeophysical Research Abstractsen_AU
dc.identifier.otherEGU2019-8524en_AU
dc.identifier.urihttps://meetingorganizer.copernicus.org/EGU2019/EGU2019-8524.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15356en_AU
dc.identifier.volume21en_AU
dc.language.isoenen_AU
dc.publisherCopernicus GmbHen_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: results from a new approach and potential for future measurementsen_AU
dc.typeConference Abstracten_AU
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