3-3-3-3-3-3-3-3-3-3-3-3-3 From: Chris Rollins <J.C.Rollins@xxxxxxxxxxx> Dear all, Due to a technical snag with the webinar format, we are recasting Dr Thomas Aubry's 29 September COMET+ webinar as a Zoom meeting (with password and waiting room). Please see the link below (note the password). We hope you will join us at 2 PM UK time tomorrow for what promises to be a fascinating talk! COMET+ Webinar: Dr Thomas Aubry, Univ Cambridge: 29 Sept 2021, 2 PM UK: "Impacts of climate change on the stratospheric volcanic sulfate aerosol lifecycle and radiative forcing from tropical eruptions" Time: Sep 29, 2021 02:00 PM London Join Zoom Meeting https://urldefense.com/v3/__https://universityofleeds.zoom.us/j/81717094544?pwd=dzhOa3VoWDJnSEc2eVc2ZnVXMEZmdz09__;!!IKRxdwAv5BmarQ!LYepX56n2aOtcN-oNWhHvrmlX_U3ZJFU9B53G2t1emlroZVN4hp5L7g1A6eDhsg$ <https://urldefense.com/v3/__https://universityofleeds.zoom.us/j/81717094544?pwd=dzhOa3VoWDJnSEc2eVc2ZnVXMEZmdz09__;!!IKRxdwAv5BmarQ!NtJJiotTFyy9jyJqy7mMYLgwxu6xz4-NK_nwfSsVAqm_g-O1QGRGhVr_NZpHGuw$> Meeting ID: 817 1709 4544 Passcode: q8aR*V Abstract: Whereas the impact of volcanic eruption on climate is a mainstream research topic, how climate change will alter volcanic processes remains largely understudied despite rapid changes in the Earth System driven by anthropogenic activities. In particular, the impacts of climate change on the stratospheric volcanic sulfate aerosol lifecycle and radiative forcing remains unexplored. Combining an eruptive column model with an aerosol-climate model, I will show that the stratospheric aerosol optical depth perturbation from frequent moderate-magnitude tropical eruptions (e.g. Nabro 2011) could be reduced by 75% in a high-end warming scenario compared to today, a consequence of future tropopause height rise and unchanged eruptive column height. In contrast, global-mean radiative forcing, stratospheric warming and surface cooling from infrequent large-magnitude tropical eruptions (e.g. Mt. Pinatubo 1991) is projected to increase by 30%, 52 and 15% in the future, respectively. These changes are driven by an aerosol size decrease, mainly caused by the acceleration of the Brewer-Dobson circulation, and an increase in eruptive column height. Quantifying changes in both eruptive column dynamics and aerosol lifecycle is therefore key to assessing the climate response to future eruptions. I will discuss the limitations of models used to investigate climate-volcano feedbacks and ongoing validation efforts. Last, I will discuss how climate-volcano feedbacks affecting different volcanic processes, such as those related to deglaciation and eruption frequency, could combine with feedbacks related to the sulfate aerosol lifecycle to shape future volcanic influences on climate. Join Zoom Meeting https://urldefense.com/v3/__https://universityofleeds.zoom.us/j/81717094544?pwd=dzhOa3VoWDJnSEc2eVc2ZnVXMEZmdz09__;!!IKRxdwAv5BmarQ!LYepX56n2aOtcN-oNWhHvrmlX_U3ZJFU9B53G2t1emlroZVN4hp5L7g1A6eDhsg$ <https://urldefense.com/v3/__https://universityofleeds.zoom.us/j/81717094544?pwd=dzhOa3VoWDJnSEc2eVc2ZnVXMEZmdz09__;!!IKRxdwAv5BmarQ!NtJJiotTFyy9jyJqy7mMYLgwxu6xz4-NK_nwfSsVAqm_g-O1QGRGhVr_NZpHGuw$> Meeting ID: 817 1709 4544 Passcode: q8aR*V Join by SIP 81717094544@xxxxxxxxxxx Join by H.323 162.255.37.11 (US West) 162.255.36.11 (US East) 221.122.88.195 (China) 115.114.131.7 (India Mumbai) 115.114.115.7 (India Hyderabad) 213.19.144.110 (Amsterdam Netherlands) 213.244.140.110 (Germany) 103.122.166.55 (Australia Sydney) 103.122.167.55 (Australia Melbourne) 209.9.211.110 (Hong Kong SAR) 149.137.40.110 (Singapore) 64.211.144.160 (Brazil) 149.137.68.253 (Mexico) 69.174.57.160 (Canada Toronto) 65.39.152.160 (Canada Vancouver) 207.226.132.110 (Japan Tokyo) 149.137.24.110 (Japan Osaka) Meeting ID: 817 1709 4544 Passcode: 572813 3-3-3-3-3-3-3-3-3-3-3-3-3 ------------------------------
