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The key role of ozone in global warming experiments

 

P.J. Nowack3, N.L. Abraham1,2,3, A.C. Maycock1,3, P. Braesicke1,3,6, J.M. Gregory1,4,5, M.M. Joshi1,4,7, A. Osprey2,4, & J.A. Pyle1,3

1) NCAS-Climate; 2) NCAS-CMS; 3) Department of Chemistry, University of Cambridge; 4) Department of Meteorology, University of Reading; 5) Met Office Hadley Centre; 6) now at Karlsruhe Institute of Technology, Karlsruhe, Germany; 7) now at Centre for Ocean and Atmospheric Sciences, University of East Anglia

 

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headshot Luke Abraham is a Senior Research Associate in the Department of Chemistry at the University of Cambridge, working with the United Kingdom Chemistry and Aerosols Chemistry-Climate Model.

What are the new findings?

Ozone is a naturally occurring gas in our atmosphere which is also affected by human emissions. Ozone can respond to a changing climate and this can alter the overall magnitude of climate change. We show that including this effect produces a 20% reduction in the warming of global surface temperature caused by an increase in atmospheric CO2.

Why are these findings important?

The full effects of ozone on atmospheric wind patterns and chemistry are ignored in many of the simulations used to make projections of future climate. Our work suggests that these simulations could be missing an important process that can impact on these climate change projections and should therefore be included. Our research has important implications for understanding factors that contribute to global surface temperature change in climate simulations, and is therefore relevant to the Assessment Reports published by the Intergovernmental Panel on Climate Change and to policymakers.

How did we discover this?

We developed a new state-of-the-art chemistry-climate simulation that includes key climate processes and also calculates its own atmospheric ozone as the simulation progresses. The experiment performed is commonly used to understand how the Earth system responds to increases in atmospheric CO2, but we also included changes to atmospheric ozone that are often neglected.

fig

Above: Simplified schematic showing simulations of global average surface temperature change. When ozone is calculated realistically (blue curve) after 75 years the global-mean surface warming is about 20% smaller than when ozone is fixed at pre-industrial levels (green curve).

Find out more:

  • see Luke Abraham's webpage
  • Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
  • Take a look at the Journal article

P.J. Nowack, N.L. Abraham, A.C. Maycock, P. Braesicke, J.M. Gregory, M.M. Joshi, A. Osprey, & J.A. Pyle: A large ozone-circulation feedback and its implications for global warming assessments. Nature Climate Change, 5, 41 (2015).

 

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This research was funded by AXA, the European Research Council through the ACCI project, the Natural Environment Research Council through the QUEST-ESM project, and the National Centre for Atmospheric Science, a collaborative centre of NERC.