This event will be held remotely over Zoom; please go here to attend!
Stratospheric ozone depletion is widely understood and has a history at UC Irvine (Sherry Rowland!). The Montreal Protocol and subsequent amendments have phased out harmful ozone depleting substances (which were also strong greenhouse gases) such as CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons). With this unprecedented scientific and policy feat, the Antarctica ozone hole is recovering. In the HATS group in the Global Monitoring Laboratory at NOAA, we are still diligently monitoring the abundance of CFCs, HCFCs, HFCs and other ozone depleting gases across the globe to ensure the international agreements are being followed. In this presentation, I will briefly discuss the history of the stratospheric ozone hole, it's discovery, and the current state of affairs. I will also introduce my current postdoctoral research at NOAA: understanding the climate driven variability in naturally emitted ozone depleting gases. As the abundance of anthropogenically-emitted ozone depleting gases declines in the atmosphere over the next few decades, the importance of the naturally-emitted compounds (example: methyl halides) that cannot be controlled through policy implementation become increasingly more important in the budget of stratospheric ozone. There is strong correlation between the variability in the atmospheric abundance of methyl halides and ENSO events. With the hypothesis that extreme ENSO events will become more frequent due to climate change, do we have another ozone hole issue on our hands? Come to my virtual Half-Baked seminar to find out the answer!