On the role of ozone feedback in the ENSO amplitude response under global warming

Nowack, Peer J., Braesicke, Peter, Abraham, N. Luke and Pyle, John (2017) On the role of ozone feedback in the ENSO amplitude response under global warming. Geophysical Research Letters, 44 (8). pp. 3858-3866. ISSN 0094-8276

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Abstract

The El Niño–Southern Oscillation (ENSO) in the tropical Pacific Ocean is of key importance to global climate and weather. However, state-of-the-art climate models still disagree on the ENSO's response under climate change. The potential role of atmospheric ozone changes in this context has not been explored before. Here we show that differences between typical model representations of ozone can have a first-order impact on ENSO amplitude projections in climate sensitivity simulations. The vertical temperature gradient of the tropical middle-to-upper troposphere adjusts to ozone changes in the upper troposphere and lower stratosphere, modifying the Walker circulation and consequently tropical Pacific surface temperature gradients. We show that neglecting ozone changes thus results in a significant increase in the number of extreme ENSO events in our model. Climate modeling studies of the ENSO often neglect changes in ozone. We therefore highlight the need to understand better the coupling between ozone, the tropospheric circulation, and climate variability.

Item Type: Article
Uncontrolled Keywords: climate change,climate variability,enso,global warming,ozone,walker circulation,geophysics,earth and planetary sciences(all) ,/dk/atira/pure/subjectarea/asjc/1900/1908
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Depositing User: LivePure Connector
Date Deposited: 11 Feb 2020 05:34
Last Modified: 28 Jul 2020 00:11
URI: https://ueaeprints.uea.ac.uk/id/eprint/74081
DOI: 10.1002/2016GL072418

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