The ice record of greenhouse gases: a view in the context of future changes

Raynaud, D.; Barnola, J.-M.; Chappellaz, J.; Blunier, T.; Indermühle, A.; Stauffer, B. (2000). The ice record of greenhouse gases: a view in the context of future changes. Quaternary Science Reviews, 19(1-5), pp. 9-17. Pergamon 10.1016/S0277-3791(99)00082-7

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Analysis of air trapped in polar ice provides the most direct information on the natural variability of Greenhouse Trace Gases (GTG). It gives the context for the dramatic change in their atmospheric concentrations induced by anthropogenic activities over the last 200 yr, leading to present-day levels which have been unprecedented over the last 400,000 yr. The GTG ice record also provides insight into the processes generally involved in the interplay between these trace gases and the climate and in particular those which are likely to take place in the next centuries in terms of climate changes and climate feedbacks on ecosystems. The paper gives selected examples of the GTG record, taken during different climatic periods in the past, and illustrating what we can learn in terms of processes.

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