A new study has confirmed the existence of a positive feedback operating in climate change whereby warming itself may amplify a rise in greenhouse gases resulting in additional warming.
The study, published in the journal Nature Climate Change, shows that in addition to the well understood effect of greenhouse gases on the Earth’s temperature, researchers can now confirm directly from ice-core data that the global temperature has a profound effect on atmospheric greenhouse gas concentrations. This means that as the Earth’s temperature rises, the positive feedback in the system results in additional warming.
It has been known for a while that the Earth has historically had higher levels of greenhouse gases during warm periods than during ice ages. However, it had so-far remained impossible to discern cause and effect from the analysis of gas bubbles contained in ice cores.
Professor Tim Lenton from Geography at the University of Exeter said: “Our new results confirm the prediction of positive feedback from the climate models, the big difference is that now we have independent data based evidence for it.”
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