Beryllium-10 transport to Antarctica: results from seasonally resolved observations and modeling

dc.contributor.authorPedro, JBen_AU
dc.contributor.authorHeikkilä, UEen_AU
dc.contributor.authorKlekociuk, ARen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorvan Ommen, TDen_AU
dc.contributor.authorCurran, MAJen_AU
dc.date.accessioned2022-06-02T21:15:57Zen_AU
dc.date.available2022-06-02T21:15:57Zen_AU
dc.date.issued2011-12-15en_AU
dc.date.statistics2022-05-20en_AU
dc.description.abstractCosmogenic 10Be measured in polar ice cores has important application in the reconstruction of past solar activity. However, the processes controlling its atmospheric transport and deposition to the ice sheets are not fully understood. Here we use the seasonal changes in 10Be concentrations in a 10 year monthly resolved ice core record from the Law Dome site (East Antarctica) in conjunction with ECHAM5-HAM general circulation model (GCM) simulations of 10Be and 7Be deposition as tools to examine this problem. Maximum 10Be concentrations are observed in the ice core during the austral late summer to early autumn (summer-autumn), while minimum concentrations are observed during the austral winter. The GCM simulations, corroborated by earlier observations of 10Be:7Be ratios in Antarctica from the Georg von Neumayer air sampling station, suggest that the 10Be concentration maximum is linked to direct input of stratospheric 10Be from the Antarctic stratosphere to the lower levels of the Antarctic troposphere during the austral summer-autumn. This result contrasts with the modeled transport of 10Be to Greenland, where the seasonal maximum in stratospheric input is seen in the late winter to spring, synchronous with the timing of the seasonal maximum in midlatitude stratosphere to troposphere exchange. Our results suggest that a different combination of processes is responsible for the transport of 10Be to the Antarctic and Greenland ice sheets. © 2011 American Geophysical Unionen_AU
dc.identifier.articlenumberD23120en_AU
dc.identifier.citationPedro, J. B., Heikkilä, U. E., Klekociuk, A., Smith, A. M., van Ommen, T. D., & Curran, M. A. J. (2011). Beryllium‐10 transport to Antarctica: results from seasonally resolved observations and modeling. Journal of Geophysical Research: Atmospheres, 116(D23), D23120. doi:10.1029/2011JD016530en_AU
dc.identifier.issn2169-8996en_AU
dc.identifier.issueD23en_AU
dc.identifier.journaltitleJournal of Geophysical Research: Atmospheresen_AU
dc.identifier.urihttps://doi.org/10.1029/2011JD016530en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13263en_AU
dc.identifier.volume116en_AU
dc.language.isoenen_AU
dc.publisherJohn Wiley & Sons, Incen_AU
dc.subjectBeryllium 10en_AU
dc.subjectAntarcticaen_AU
dc.subjectMeteorologyen_AU
dc.subjectDrill coresen_AU
dc.subjectSolar activityen_AU
dc.subjectSimulationen_AU
dc.subjectSeasonsen_AU
dc.subjectStratosphereen_AU
dc.subjectTroposphereen_AU
dc.titleBeryllium-10 transport to Antarctica: results from seasonally resolved observations and modelingen_AU
dc.typeJournal Articleen_AU
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