2-2-2-2-2-2-2-2-2-2-2-2-2 From: Yasser Maghsoudi Mehrani <Y.Maghsoudi@xxxxxxxxxxx> Dear Colleagues, COMET (The Centre for Observation and Modelling of Earthquakes, Volcanoes, and Tectonics) invites you to the next installment of our COMET+ webinar series, viewable from the home office. *Aerosol formation in young volcanic plumes: insights from OP-FTIR measurements * *Wednesday 25**th** October 2023 at 4pm UK time* (3pm UTC / 5pm CEST / 8am PST) *Dr Jean-François Smekens* *University of Oxford, UK* *Please register at: * https://urldefense.com/v3/__https://universityofleeds.zoom.us/webinar/register/WN_u9brbikZTISGQsOUa7UZ6w__;!!IKRxdwAv5BmarQ!andodVKXKcdpuoP5C8KucxjEDEhXUsZQWfIHPs1q_hLqIX1ZNKpd8cDb-IqiFjk5x5yGfooXWwcvE4r3$ <https://urldefense.com/v3/__https://universityofleeds.zoom.us/webinar/register/WN_u9brbikZTISGQsOUa7UZ6w__;!!IKRxdwAv5BmarQ!YbOxW-LUrkBEs11bFg_NsAlJj5sIDM9MrcKO2ck_tAXxpL-KlEvMZ43HmWNI8gTWlG1IhtONLj-l-xb1hp--QVI$> (After registering, you will receive a confirmation email containing information on how to join the webinar) *Abstract:* Gas and particulate emissions accompanying volcanic eruptions present significant health hazards to nearby communities. Their composition reflects initial volatile contents and magma ascent processes and can be used to reveal the dynamics that drive the surface activity. Open Path Fourier Transform Infrared (OP-FTIR) spectroscopy has been used over the past 3 decades as a tool to measure the relative abundances of major and trace volcanic gases (including SO2, CO2, H2O, HF, HCl, CO, OCS) in a variety of measurement geometries (e.g., direct line-of-sight, active source, solar/lunar occultation). Here we argue that these data contain additional information, specifically at longer wavelengths, that has been overlooked until now. We will show that sulphate aerosols (SA) are responsible for distinctive spectral features in the thermal infrared window (750-1250 cm-1) and present an algorithm capable of quantifying their abundance and size distribution from both absorption and emission measurements. We evaluate its applicability and limitations using datasets from recent eruptions at Fagradalfsjall in Iceland and Stromboli in Italy. The SO2/SO42- ratio can be retrieved along with the size of the aerosol fraction, providing a new tool to understand the rapid chemical and physical processes occurring in very young plumes. The COMET+ webinar series promotes research by collaborators of COMET scientists. We aim to provide a platform for these researchers to showcase their work to large and international audiences, opening doors to broader collaborative networks and enhancing the communityâ??s diversity of backgrounds and ideas. Catch up on past COMET and COMET+ webinars on our YouTube page: https://urldefense.com/v3/__https://www.youtube.com/channel/UCtFDytX1hgjvlS4NH48M2oQ/video__;!!IKRxdwAv5BmarQ!andodVKXKcdpuoP5C8KucxjEDEhXUsZQWfIHPs1q_hLqIX1ZNKpd8cDb-IqiFjk5x5yGfooXWyDAMbL-$ <https://urldefense.com/v3/__https://www.youtube.com/channel/UCtFDytX1hgjvlS4NH48M2oQ/videos__;!!IKRxdwAv5BmarQ!YbOxW-LUrkBEs11bFg_NsAlJj5sIDM9MrcKO2ck_tAXxpL-KlEvMZ43HmWNI8gTWlG1IhtONLj-l-xb1Oud0V_U$> Best wishes, Isabelle Taylor & Yasser Maghsoudi COMET - Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics https://urldefense.com/v3/__https://comet.nerc.ac.uk/__;!!IKRxdwAv5BmarQ!andodVKXKcdpuoP5C8KucxjEDEhXUsZQWfIHPs1q_hLqIX1ZNKpd8cDb-IqiFjk5x5yGfooXWzP2XlUn$ <https://urldefense.com/v3/__https://comet.nerc.ac.uk/__;!!IKRxdwAv5BmarQ!YbOxW-LUrkBEs11bFg_NsAlJj5sIDM9MrcKO2ck_tAXxpL-KlEvMZ43HmWNI8gTWlG1IhtONLj-l-xb1smFK164$> @NERC_COMET <https://urldefense.com/v3/__https://twitter.com/nerc_comet?lang=en__;!!IKRxdwAv5BmarQ!YbOxW-LUrkBEs11bFg_NsAlJj5sIDM9MrcKO2ck_tAXxpL-KlEvMZ43HmWNI8gTWlG1IhtONLj-l-xb14fejPPc$> 2-2-2-2-2-2-2-2-2-2-2-2-2 ------------------------------
