Understanding the production and retention of in situ cosmogenic 14C in polar firn

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dc.contributor.authorHmiel, Ben_AU
dc.contributor.authorPetrenko, VVen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorBruizert, Cen_AU
dc.contributor.authorHarth, CMen_AU
dc.contributor.authorBeaudette, Ren_AU
dc.contributor.authorPlace, PFen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorYang, Ben_AU
dc.contributor.authorVimont, Ien_AU
dc.contributor.authorWeiss, RFen_AU
dc.contributor.authorSeveringhaus, JPen_AU
dc.contributor.authorBrook, EJen_AU
dc.contributor.authorWhite, JWCen_AU
dc.date.accessioned2020-06-12T06:34:10Zen_AU
dc.date.available2020-06-12T06:34:10Zen_AU
dc.date.issued2016-03-07en_AU
dc.date.statistics2020-05-28en_AU
dc.description.abstractRadiocarbon in CO2, CO and CH4 trapped in polar ice is of interest for dating of ice cores, studies of past solar activity and cosmic ray flux, as well as studies of the paleoatmospheric CH4 budget. The major difficulty with interpreting 14C measurements in ice cores stems from the fact that the measured 14C represents a combination of trapped paleoatmospheric 14C and 14C that is produced within the firn and ice lattice by secondary cosmic ray particles. This in situ cosmogenic 14C component in ice is at present poorly understood. Prior ice core 14C studies show conflicting results with regard to the retention of cosmogenic 14C in polar firn and partitioning of this 14C among CO2, CO and CH4. Our new study aims to comprehensively characterize the 14C of CO2, CO, and CH4 in both the air and the ice matrix throughout the firn column at Summit, Greenland. We will present measurements of 14C in Summit firn air (the first phase of this study) and discuss the implications for in situ cosmogenic 14C production and retention from initial modeling studies. Preliminary results from firn air indicate a 14CO increase with depth in the lock-in zone resulting from in situ production by muons, as well as a lock-in zone 14CO2 bomb peak originating from nuclear testing in the late 1950s and early 1960s. A decrease in 14CH4 with depth is observed in the lock-in zone that is in agreement with observations of increasing atmospheric 14CH4 over the past several decades.en_AU
dc.identifier.citationHmiel, B., Petrenko, V. V., Smith, A. M, Buizert, C., Harth, C., Beaudette, R., Place, P. F., Hua, Q., Yang, B., Vimont, I., Weiss, R. F., Severinghaus, J. P., Brook, E. J., & White, J. W. (2016). Understanding the production and retention of in situ cosmogenic 14C in polar firn. Paper presented at the IPICS 2016, International Partnerships in Ice Core Sciences, Second Open Science Conference, 7-11 March 2016, Hobart, Tasmania.en_AU
dc.identifier.conferenceenddate11 March 2016en_AU
dc.identifier.conferencenameIPICS 2016, International Partnerships in Ice Core Sciences, Second Open Science Conferenceen_AU
dc.identifier.conferenceplaceHobart, Tasmaniaen_AU
dc.identifier.conferencestartdate7 March 2016en_AU
dc.identifier.govdoc9608en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9636en_AU
dc.language.isoenen_AU
dc.publisherAntarctic Climate and Ecosystems Cooperative Research Centreen_AU
dc.subjectDrill coresen_AU
dc.subjectAntarctic regionsen_AU
dc.subjectCarbon 14en_AU
dc.subjectIceen_AU
dc.subjectGreenlanden_AU
dc.subjectCosmic ray spectrometersen_AU
dc.titleUnderstanding the production and retention of in situ cosmogenic 14C in polar firnen_AU
dc.typeConference Abstracten_AU
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