Thorsten Bartels-Rausch

Day 2 of @faradaydiscussions.rsc.org on *Atmospheric Chemistry in Cold Environments* in full swing. Cool concept: Fresh & new publications are intensively discussed & comments/questions of the expert audience are published together with the final publication. #CATCHscience

@faradaydiscussions.rsc.org

Here we are, opening the Faraday Discussion on Atmospheric Science in the Cold in London. 👩🏼‍💻👨🏽‍💻👨‍🔬🧑🏻‍🔬👩🏼‍🔬👨🏼‍🔧🧑🏻‍🔧😎🥳🧐

Endlich wieder, Start der 60. Solothurner Filmtage mit dem Eismann

ERCA in Grenoble. Nice to be back and meet so many students from all over the world

Solothurner Filmtage

www.solothurnerfilmtage.ch/de/

My opinion: Scientists should get paid for thinking time

"Thinking time is often undervalued; it is rarely, if ever, quantified in employment practices."

www.nature.com/articles/d41...

Bioaerosols make it all the way up to the frozen North Pole, where they can impact clouds! 🦠🐻‍❄️☁️ Check out our new publication led by Julia Kojoj within a fantastic collaboration our H2020 project CRiceS 👉 b.tellusjournals.se/articles/10.... @Stockholm_Uni @AcesSthlmUni

Vienna, I’m coming

Infographic showing a visual of the highlights and headlines in the 2024 Arctic Report Card for all different impacts across the Earth system and society. This chart is available from https://doi.org/10.25923/b7c7-6431.

🧵 Our annual NOAA Arctic Report Card is available today for 2024. It discusses recent changes in the #Arctic, extreme events, and broader human/environmental impacts. ⚒️🧪🌊❄️

+ Report: arctic.noaa.gov/report-card/...
+ Video: www.youtube.com/watch?v=0yqG...
+ Summary: arctic.noaa.gov/report-card/...

Iodine Activation from Iodate Reduction in Aqueous Films via Photocatalyzed and Dark Reactions Iodine in the atmosphere destroys ozone and can nucleate particles by formation of iodic acid, HIO3. Recent field observations suggest iodate recycles from particles sustaining significant gas-phase IO radical concentrations (0.06 pptv) in aged stratospheric air, and in elevated dust plumes. However, laboratory evidence for iodine activation from aerosols is currently missing. Here, a series of coated-wall flow tube (CWFT) experiments test for iodine release from thin aqueous films containing iodate. Photocatalyzed reactions were studied using iron(III) citrate (Fe–Cit), Arizona Test Dust (ATD), and Fe2O3, along with the dark reaction of iodate with H2O2 at 90% RH and 293 K. Fresh films were separately irradiated with visible and UV-A light, and the efficient release of molecular iodine, I2, was observed from all irradiated films containing photocatalysts. For films with Fe–Cit, visible light reduced larger amounts of iodate than UV-A light, activating ∼40% of iodate as I2. The formation of oxygenated volatile organic compounds (OVOC) and iodinated OVOC was also observed. Dark exposure of films to H2O2 led to I2 release in smaller amounts than suggested by Bray–Liebhafsky kinetics, consistent with H2O2 salting-out in the films, or possibly other reasons. Photochemical activation is enhanced by dust proxies in the film, and by aging the film with H2O2 in the dark prior to irradiation. These findings help explain recent field observations of elevated IO radical concentrations in lofted dust layers, and warrant the inclusion of photocatalyzed iodate reduction in atmospheric models.

New publication out: doi.org/10.1021/acse.... Iodate Recycling. Great job, Mago and Lucia! Great collaboration with UC Boulder (Rainer Volkamer 's group)

Saturday-night-family-movie-evening: The difference in how the same story is told could not be more extreme.

📣 Upcoming CATCH seminar by Ursula Jongebloed (University of Washington, USA) on January 15th, 2025 at 8 PST (17 CET) on "Sulfate sources and chemistry from the pre-industrial to present day inferred from ice core observations and global model simulations". Zoom link on our website! #CATCHscience

Last week, the 1st planning workshop for the International Polar Year (IPY) 2032-33 took place at Aussois 🇫🇷 around the topic of chemical, biogeochemical & physical drivers of the polar atmosphere & climate. Exciting science plans developing!