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Impacts of Stratospheric Ozone Recovery on Southern Ocean Temperature and Heat Budget
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Impacts of Stratospheric Ozone Recovery on Southern Ocean Temperature and Heat Budget
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Impacts of Stratospheric Ozone Recovery on Southern Ocean Temperature and Heat Budget
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Journal Article
Impacts of Stratospheric Ozone Recovery on Southern Ocean Temperature and Heat Budget
2023
Overview
The impacts of stratospheric ozone recovery on Southern Ocean surface and interior temperature, heat content, heat uptake, and heat transport are investigated by contrasting two ensemble chemistry-climate model simulations in 2005–2099: one with fixed ozone depleting substances (ODSs) and another with decreasing ODSs. In our simulations ozone recovery significantly affects Southern Ocean temperature, with large latitudinal and vertical variations. Ozone recovery causes a dipole change of the full-depth ocean heat content (OHC) with an increase south of 60°S and a decrease between 45°S and 60°S. Integrated over latitudes south of 40°S, OHC decreases in response to ozone recovery. This ocean heat loss is shown to be driven by weakened poleward ocean heat transport (OHT) across 40°S, which is partly canceled by enhanced heat uptake. The weakening of poleward OHT into the Southern Ocean is caused by the ozone-induced equatorward shift of the meridional overturning circulation.
