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Understand the interaction between stratospheric ozone and climate

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Wednesday, 03 July 2019, 12:00

Wednesday, July 3, 2019. 12:00PM. Understand the interaction between stratospheric ozone and climate. Pu Lin, GFDL. Sponsored by NOAA GFDL. More information here.

 

Changes in the stratospheric ozone play important roles in shaping the climate over the historical periods as well as in the warming future. While the direct radiative effects of ozone changes is straightforward to understand and is well simulated in most climate models, the full interaction between ozone and climate involves much more processes and lacks a complete understanding. Here, we compare AM4 simulations with prescribed ozone versus interactive ozone. With similar amount of ozone depletion over the historical period, the model with interactive ozone simulates stronger stratospheric cooling over the Antarctica. This is because the interactive ozone leads to a weaker damping to the waves in the stratosphere and hence a weaker dynamical heating over the polar region. In the SST warming simulations, models with interactive ozone simulate ozone changes as a result of a stronger overturning circulation in the stratosphere, which further leads to colder tropical tropopause and drier stratosphere. However, these changes in ozone and the associated stratospheric water vapor do not translate into any significant changes in the Cess sensitivity or tropospheric circulation patterns.

Location  NOAA GFDL, Smagorinsky Seminar Room, Princeton University, Princeton, NJ.