Solar and climate influences on ice core 10Be records from Antarctica and Greenland during the neutron monitor era

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dc.contributor.authorPedro, JBen_AU
dc.contributor.authorMcConnell, JRen_AU
dc.contributor.authorvan Ommen, TDen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorCurran, MAJen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorSimon, KJen_AU
dc.contributor.authorMoy, ADen_AU
dc.contributor.authorDas, SBen_AU
dc.date.accessioned2021-12-16T02:18:36Zen_AU
dc.date.available2021-12-16T02:18:36Zen_AU
dc.date.issued2012-11-15en_AU
dc.date.statistics2021-11-11en_AU
dc.description.abstractCosmogenic 10Be in polar ice cores is a primary proxy for past solar activity. However, interpretation of the 10Be record is hindered by limited understanding of the physical processes governing its atmospheric transport and deposition to the ice sheets. This issue is addressed by evaluating two accurately dated, annually resolved ice core 10Be records against modern solar activity observations and instrumental and reanalysis climate data. The cores are sampled from the DSS site on Law Dome, East Antarctica (spanning 1936–2009) and the Das2 site, southeast Greenland (1936–2002), permitting inter-hemispheric comparisons. Concentrations at both DSS and Das2 are significantly correlated to the 11-yr solar cycle modulation of cosmic ray intensity, rxy=0.54 with 95% CI [0.31; 0.70], and rxy=0.45 with 95% CI [0.22; 0.62], respectively. For both sites, if fluxes are used instead of concentrations then correlations with solar activity decrease. The strength and spectral coherence of the solar activity signal in 10Be is enhanced when ice core records are combined from both Antarctica and Greenland. The amplitudes of the 11-yr solar cycles in the 10Be data appear inconsistent with the view that the ice sheets receive only 10Be produced at polar latitudes. Significant climate signals detected in the 10Be series include the zonal wave three pattern of atmospheric circulation at DSS, rxy=−0.36 with 95% CI [−0.57; −0.10], and the North Atlantic Oscillation at Das2, rxy=−0.42 with 95% CI [−0.64; −0.15]. The sensitivity of 10Be concentrations to modes of atmospheric circulation advises caution in the use of 10Be records from single sites in solar forcing reconstructions. © 2012 Elsevier B.V.en_AU
dc.identifier.citationPedro, J. B., McConnell, J. R., van Ommen, T. D., Fink, D., Curran, M. A. J., Smith, A. M., Simon, K. J., Moy, A. D., Das, S. B. (2012). Solar and climate influences on ice core 10Be records from Antarctica and Greenland during the neutron monitor era. Earth and Planetary Science Letters, 355–356, 174-186. doi:10.1016/j.epsl.2012.08.038en_AU
dc.identifier.issn0012-821Xen_AU
dc.identifier.journaltitleEarth and Planetary Science Lettersen_AU
dc.identifier.pagination174-186en_AU
dc.identifier.urihttps://doi.org/10.1016/j.epsl.2012.08.038en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12480en_AU
dc.identifier.volume355-356en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectBeryllium 10en_AU
dc.subjectIceen_AU
dc.subjectSolar activityen_AU
dc.subjectAtmospheric circulationen_AU
dc.subjectClimatesen_AU
dc.subjectAntarcticaen_AU
dc.subjectGreenlanden_AU
dc.titleSolar and climate influences on ice core 10Be records from Antarctica and Greenland during the neutron monitor eraen_AU
dc.typeJournal Articleen_AU
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