Abstract
AbstractThere are large uncertainties in the estimation of greenhouse-gas climate feedback. Recent observations do not provide strong constraints because they are short and complicated by human interventions, while model-based estimates differ considerably. Rapid climate changes during the last glacial period (Dansgaard-Oeschger events), observed near-globally, were comparable in both rate and magnitude to current and projected 21st century climate warming and therefore provide a relevant constraint on feedback strength. Here we use these events to quantify the centennial-scale feedback strength of CO2, CH4 and N2O by relating global mean temperature changes, simulated by an appropriately forced low-resolution climate model, to the radiative forcing of these greenhouse gases derived from their concentration changes in ice-core records. We derive feedback estimates (expressed as dimensionless gain) of 0.14 ± 0.04 for CO2, 0.10 ± 0.02 for CH4, and 0.09 ± 0.03 for N2O. This indicates that much lower or higher estimates of gains, particularly some previously published values for CO2, are unrealistic.
Publisher
Springer Science and Business Media LLC
Subject
General Earth and Planetary Sciences,General Environmental Science
Reference70 articles.
1. Woodwell, G. M. et al. Will the warming speed the warming? in Biotic Feedbacks in the Global Climate System: Will the Warming Feed the Warming? (eds Woodwell, G. M. & Mackenzie, F. T.) 393–411 (Oxford University Press, Inc, 1995).
2. Roe, G. Feedbacks, timescales, and seeing red. Annu. Rev. Earth Planet. Sci. 37, 93–115 (2009).
3. Prentice, I. C., Williams, S. & Friedlingstein, P. Biosphere feedbacks and climate change. Grantham Institute Briefing Papers 12, 19 (2015).
4. Arneth, A. et al. Terrestrial biogeochemical feedbacks in the climate system. Nat. Geosci. 3, 525–532 (2010).
5. Arneth, A., Mercado, L., Kattge, J. & Booth, B. Future challenges of representing land-processes in studies on land-atmosphere interactions. Biogeosciences 9, 3587–3599 (2012).
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