Atmospheric CO₂ over the last 1000 years: A high-resolution record from the West Antarctic Ice Sheet (WAIS) Divide ice core Public Deposited

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  • Atmospheric CO2 over the last 1000 years: A high-resolution record from the West Antarctic Ice Sheet (WAIS) Divide ice core
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  • We report a decadally resolved record of atmospheric CO₂ concentration for the last 1000 years, obtained from the West Antarctic Ice Sheet (WAIS) Divide shallow ice core. The most prominent feature of the pre-industrial period is a rapid ∼7 ppm decrease of CO₂ in a span of ∼20–50 years at ∼1600 A.D. This observation confirms the timing of an abrupt atmospheric CO₂ decrease of ∼10 ppm observed for that time period in the Law Dome ice core CO₂ records, but the true magnitude of the decrease remains unclear. Atmospheric CO₂ variations over the time period 1000–1800 A.D. are statistically correlated with northern hemispheric climate and tropical Indo-Pacific sea surface temperature. However, the exact relationship between CO₂ and climate remains elusive due to regional climate variations and/or uneven geographical data density of paleoclimate records. We observe small differences of 0 ∼ 2% (0 ∼ 6 ppm) among the high-precision CO₂ records from the Law Dome, EPICA Dronning Maud Land and WAIS Divide Antarctic ice cores. However, those records share common trends of CO₂ change on centennial to multicentennial time scales, and clearly show that atmospheric CO₂ has been increasing above preindustrial levels since ∼1850 A.D.
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  • Ahn, J., E. J. Brook, L. Mitchell, J. Rosen, J. R. McConnell, K. Taylor, D. Etheridge, and M. Rubino (2012), Atmospheric CO₂ over the last 1000 years: A high-resolution record from the West Antarctic Ice Sheet (WAIS) Divide ice core, Global Biogeochemical Cycles, 26, GB2027, doi:10.1029/2011GB004247.
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  • description.provenance : Made available in DSpace on 2012-08-09T00:23:03Z (GMT). No. of bitstreams: 1 BrookEdwardCEOASAtmosphericCO2Over.pdf: 921807 bytes, checksum: 6edce8934df3d9f1c01d008ba18f1e10 (MD5) Previous issue date: 2012-05-26
  • Global Biogeochemical Cycles
  • Vol. 26 no. GB2027
  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2012-08-09T00:23:03Z No. of bitstreams: 1 BrookEdwardCEOASAtmosphericCO2Over.pdf: 921807 bytes, checksum: 6edce8934df3d9f1c01d008ba18f1e10 (MD5)

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