Polar Ice Cores Annual 10Be Data for the Neutron Monitor Era Pedro, 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. Pedro, 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. earth science/paleoclimate/ice cores (ice age,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (10Be,bulk ice,null,standard deviation unit,null,ice cores,normalized,accelerator mass spectrometry,N,null) earth science/paleoclimate/ice cores (delta 18O,bulk ice,null,per mil VSMOW,null,ice cores,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/ice cores (10Be,bulk ice,null,null,null,ice cores,null,accelerator mass spectrometry,N,atom per milligram) earth science/paleoclimate/ice cores (10Be,bulk ice,one standard error,null,null,ice cores,null,accelerator mass spectrometry,N,atom per milligram) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,meter per year,null,ice cores,null,null,N,m ice equivalent/year) earth science/paleoclimate/ice cores (10Be,bulk ice,one standard error,count per square meter per second,null,ice cores,null,accelerator mass spectrometry,N,atom per square meter per second) earth science/paleoclimate/ice core (Das2>LATITUDE 67.5273>LONGITUDE -36.0615) (Law Dome>LATITUDE -66.73>LONGITUDE 112.83) Cosmogenic 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. STUDY NOTES: Annually-resolved 10Be concentrations, stable water isotope ratios and accumualtion rate data from the DSS site on Law Dome, East Antarctica (spanning 1936-2009) and the Das2 site, southeast Greenland (1936-2002). A composite record constructed from these records and previously published records from NGRIP, Renland and Dye 3 (Greenland) and Dronning Maud Land (Antarctica) is also provided. References for DSS data spanning 2000-2010: Pedro et al. Clim. Past 7:707; Pedro et al. JGR 116:D23120 Note: All measurements are calibrated to the NIST SRM 4325 10Be standard reference material, utilising the Nishiizumi et al. (2007) 10Be:9Be ratio of (2.79 +/- 0.02) x 10^(-11) NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Pedro, J.B. Investigator : McConnell, J.R. Investigator : van Ommen, T.D. Investigator : Fink, D. Investigator : Curran, M.A.J. Investigator : Smith, A.M. Investigator : Simon, K.J. Investigator : Moy, A.D. Investigator : Das, S.B. 2012-11-07 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13566 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/pedro2012bipolar10be.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/pedro2012law10be.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/pedro2012greenland10be.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/pedro2012bipolar10be.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/pedro2012law10be.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/pedro2012greenland10be.txt English https://www.ncdc.noaa.gov/paleo/study/13566 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/pedro2012bipolar10be.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/pedro2012law10be.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/pedro2012greenland10be.txt J.B. Pedro, J.R. McConnell, T.D.van Ommen, D.Fink, M.A.J. Curran, A.M. Smith, K.J. Simon, A.D.Moy, S.B.Das. 2012. Solar and climate influences on icecore 10Be records from Antarctica and Greenland during the neutron monitor era. Earth and Planetary Science Letters, Vol. 355-356, pp. 174-186. DOI: 10.1016/j.epsl.2012.08.038 START YEAR: 1936 AD * END YEAR: 2009 AD -36.0615 -66.73 112.83 67.5273