Ahn, J, Brook, EJ, Mitchell, L, Rosen, J, McConnell, JR, Taylor, K, Etheridge, D and Rubino, M (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 (2).

[img]
Preview
Text
2012_Ahn_Atmospheric_CO2_over_the_last_1000_years_high_resolution_record_from_WAIS.pdf - Published Version
Available under License Creative Commons Attribution Non-commercial.

Download (921kB) | Preview

Abstract

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.

Item Type: Article
Uncontrolled Keywords: antartica; biogeochemical cycles; carbon cycle; carbon dioxide; ice core; paleoclimate
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
Related URLs:
Depositing User: Symplectic
Date Deposited: 03 May 2018 10:02
Last Modified: 03 Jun 2019 11:50
URI: https://eprints.keele.ac.uk/id/eprint/4841

Actions (login required)

View Item View Item