Changing Emissions and Atmospheric Chemistry: Ongoing Impacts on Air Quality and Climate

Rapid emission changes from pollution control & human activities impact urban air quality, biosphere-atmosphere interactions, aerosols, clouds, climate, and POPs transport.
#ChangingEmissions #AtmosChem #AirQuality #Climate pubs.acs.org/doi/10.1021/...

For me this has got to be glyoxal, which i believe is the most annoying and infuriating molecule in atmospheric chemistry. It polymerises, reacts in crazy ways and is a total nightmare to analyse. Any other suggestions? #atmoschem

Contrasting Biogenic Isoprene Emission Responses to La Niña and El Niño Driven by Temperature: Insights from HCHO-Based Global Inversion Isoprene strongly influences atmospheric chemistry by consuming hydroxyl radicals, forming secondary organic aerosols, and affecting methane’s lifetime. Accurate monitoring of its emissions is thus essential for understanding biosphere–atmosphere feedbacks, particularly under climate extremes. We develop a regression-based inversion framework to estimate global monthly biogenic isoprene emissions (2019–2024), integrating TROPOspheric Monitoring Instrument (TROPOMI) HCHO columns and LMDZ-INCA atmospheric transport model. Our inversion yields a global annual mean emission of 456 ± 249 TgC yr–1, with a minimum in 2022 (437 TgC, 1.4σ below multiyear mean) and a peak in 2024 (477 TgC, 1.5σ above), closely tracking global annual land surface temperature variations (R = 0.95). Emission anomalies are most pronounced in tropical regions contributing over 80% of global total anomalies during the 2020–2023 La Niña (−30 TgC), 2023–2024 El Niño (+11 TgC), and 2024 Northern Hemisphere extreme warming events (+15 TgC). Attribution analysis confirms surface temperature as the dominant driver of biogenic isoprene anomalies, with increasing sensitivity in Northern high-latitude zones under warming conditions. The updated emissions improve spatial agreement and reduce bias in LMDZ-INCA simulations against independent satellite-based isoprene and ground-based HCHO observations. This work delivers the first HCHO-constrained global isoprene emission data set through 2024, supporting air quality, oxidant budget, and climate feedback studies.

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A nice application combining 🛰️(TROPOMI) and global modeling to learn more about #isoprene, very important organic gas released by plants and used as a tracer to better understand biological atmospheric-land interactions .

#atmoschem

pubs.acs.org/doi/10.1021/...

Time series showing extent of the 2025 Antarctic ozone hole

The absolute highlight of the Kennaook/Cape Grim #AtmosChem science meeting is always Paul Krummel's update on the Antarctic #OzoneHole. This year, the hole closed by the end of November #CSIRO

Modelling stratospheric composition for the Copernicus Atmosphere Monitoring Service: multi-species evaluation of IFS-COMPO Cy49 Abstract. The daily analyses and forecasts of atmospheric composition delivered by the Copernicus Atmosphere Monitoring Service (CAMS) are produced by the ECMWF Integrated Forecasting System configure...

Modelling stratospheric composition for the #CopernicusAtmosphere Monitoring Service: multi-species evaluation of IFS-COMPO Cy49 by Chabrillat et al. published in
@egu.eu Geoscientific Model Development gmd.copernicus.org/articles/18/... #AtmosChem @copernicusecmwf.bsky.social @ecmwf.int

#chempostdoc #atmoschem

How are changing fuels & EVs transforming urban air chemistry and health?
Join our #EGU26 session: “Urban Air Pollutants in the Anthropocene: Composition, Chemistry & Health Impacts.”
meetingorganizer.copernicus.org/EGU26/sessio...
#AirPollution #AtmosChem #UrbanHealth
@pallavires.bsky.social

It was great presenting my work and catching up with colleagues old and new at the 1st UK Atmospheric Chemistry conference in York. Looking forward to the next iterations in the future #atmoschem

Phase-dependent thermodynamics and kinetics of sulfate radical oxidation of metazachlor herbicide: a theoretical study - Chemical Papers The sulfate radical anion (SO4●–)-initiated oxidation of the herbicide metazachlor (MTZ) was investigated in aqueous and gaseous phases using the density functional theory at the M06-2X/6-311++G(3df,3...

Happy to share our last paper on #pesticides #atmoschem
published in Chemical Papers

Fruitful international colllaboration @univlille.bsky.social @cnrs-hautsdefrance.bsky.social @comeniusuni.bsky.social Duy Tan University

link.springer.com/article/10.1...

Observation and modeling of atmospheric OH and HO2∗ radicals at a subtropical rural site and implications for secondary pollutants Abstract. HOx radicals (OH and HO2) are crucial oxidants that determine atmospheric oxidation capacity and the production of secondary pollutants; however, their sources and sinks remain incompletely ...

🚀 Our new Atmos.Chem.Phys. paper: Subtropical field data show even the detailed MCM over‑predicts HO₂, driving modeled daytime O₃ up by ~80 % and elevating HNO₃. Missing HOx sinks and rapid recycling could bias future air‑quality and climate projections. #HOx #AtmosChem #Modeling #Climate

Two-years of stratospheric chemistry perturbations from the 2019–2020 Australian wildfire smoke Abstract. The very large pyrocumulonimbus events that occurred during the Australian summer of 2019–2020 caused extremely unusual partitioning of stratospheric chlorine in the Southern Hemisphere midl...

Two-years of stratospheric chemistry perturbations from the 2019–2020 Australian wildfire smoke, Stone et al. published in Atmospheric Chemistry and Physics acp.copernicus.org/articles/25/... @egu.eu @eapsmit.bsky.social #wildfires #atmoschem

Watch MTG-S1 and Sentinel-4 launch live The second of the Meteosat Third Generation (MTG) satellites and the first instrument for the Copernicus Sentinel-4 mission are ready for liftoff at Cape Canaveral in Florida, US. Live coverage of thi...

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For those #atmoschem and 🛰️ enthusiasts out there, today ESA is launching a new geostationary satellite exclusively dedicated to atmospheric composition .

Sentinel 4 carries a sensor similar to Tropomi and it will do several observations per day (as opposed to once)

www.esa.int/Applications...

Raffle for the 2025 ECR Online Conference! 📢

Register or submit an abstract by July 1 for a chance to win an exclusive tote bag.
➡️ 10 bags for registrations
➡️ 5 bags for abstract submissions
Already signed up? You're automatically entered!
Register/Submit here: shorturl.at/WLLNs
#AtmosChem #ECR

What is common knowledge in your field but shocks outsiders?

"OH" is not just an exclamation, but also saves our atmosphere from becoming toxic
[OH radicals #AtmosChem]

Thanks to everyone on #TeamMassSpec for a great #ASMS2025 - my first! I’m coming away with great new connections, inspirations, and ideas for our current research in multiphase atmospheric and indoor chemistry. #IndoorChem #AtmosChem 🧪⚗️

In the middle of hosting two amazing field campaigns! **COAST-VOC** (www.helsinki.fi/en/researchg...) and **CARES**: (nerccares.wordpress.com)
Science in action at the land-sea-atmosphere interface! 🌿 @ovadnevaite.bsky.social
#COASTVOC #CARES #ClimateScience #AtmosChem

Hey #TeamMassSpec come check out our work on disinfection byproducts from bleach *vapor* chemistry. Unlocking new science with a #SICRIT technique… learn more at WP120 here at #ASMS2025 today. #UndergradResearch #IndoorChem #AtmosChem 🧪⚗️

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#aerosols #atmoschem #postdoc

An Atmospheric Chemistry Perspective on Airborne Micro- and Nanoplastic Particles Micro- and nanoplastic particles (MNPPs) are emerging pollutants with significant environmental impacts due to their persistence, increasing concentrations, and potential health risks. Most MNPP studies have focused on identifying, quantifying, and assessing their ecotoxicological impacts in water or soil. However, the atmosphere is crucial in transporting and chemically transforming MNPPs. Further, well-established aerosol particle characterization techniques are underutilized and inconsistently applied in existing atmospheric MNPP studies. This perspective synthesizes the existing literature and addresses future research needs unique to atmospheric MNPPs, highlighting the need to bridge the microplastics and atmospheric aerosol communities to better understand their sources, chemical transformations, transport mechanisms, as well as their health effects and ecological impacts, which differ from those in soil and water. Advancing research in these areas requires standardized methods and a multidisciplinary approach to comprehensively assess MNPP interactions across environmental compartments, providing essential insights into their environmental fate and risks.

Excited to share our new perspective paper in ES&T on atmospheric micro- & nanoplastic particles! 🧪
We cover recent advances & future directions in this emerging area. Great collaboration with Nate Slade, Arthur Chan & Andy Ault!
📄 pubs.acs.org/doi/10.1021/...
#AtmosChem #Microplastics #Nanoplastics

IGAC eBulletin - March 2025

New IGAC e-bulletin out! Many IGAC and other #atmoschem events coming up: mailchi.mp/igacproject/...

📢 Join the next IGAC-iCACGP Early Career Seminar!

🗓️ March 25th, 3-4 PM (UTC)
🎤 Speakers:
🔸 Mahendar Chand Rajwar (ARIES, India)
🔸 Connor Barker (UCL, UK)

🔗 Register now: bit.ly/ECR-Seminar3
#AtmosChem #ECR #ScienceSeminar

🧪 #atmoschem

Cutting edge research at #NOAA at risk,
things that nobody else does and improve our life.

Some examples here. 👇

Survey for early career scientists, upcoming #atmoschem event information, announcements for IGAC Activity events, and more in the IGAC e-bulletin!

January IGAC ebulletin out! Survey for ECRs from @igac-ecr.bsky.social, opportunities for funding, #atmoschem related meeting news, newsletter links for IGAC activities and working groups, and other news.

Hello #atmoschem world! Finally the IGAC (international global atmospheric chemistry) project made it to bluesky. Just finished a meeting on the 2026 conference in Crete (7-11 September 2026) and getting excited! Mark your calendars and look for more announcements soon.

Is the air quality index actually useful right now? The air has improved in the LA region as firefighters get blazes under control, but there are questions about how safe the air actually is.

The LA fires are a staggering example of needing to understand how emerging pollutants are produced by #wildfires at the wildland/urban interface #WUI #chemsky #atmoschem #envirochem 🧪 ⚗️ www.npr.org/2025/01/18/n...

Role of the stratosphere in the global mercury cycle The stratosphere facilitates the processing and global dispersion of mercury from polluted source regions to remote environments.

New study out on the role of the stratosphere in the global mercury cycle. A substantial amount of mercury is oxidized in the lower stratosphere, the layer of the atmosphere above ~10 km, with distinct processes from the troposphere.

www.science.org/doi/10.1126/...

#atmoschem #MakeMercuryHistory

Any #AtmosChem / #IndoorChem folks following me have tips for dealing with any smoke that manages to seep inside? Mainly thinking of how to clean up once the worst is over.

My best guess is wiping down surfaces and washing linens.

Am I forgetting anything?

#ChemSky

🧪🌊💨
Postdoc opportunity in a great group. Google it.

#atmoschem #atmosocean #biogeochemicalcycles #atmosjobs #chemjobs

@usocb.bsky.social @igac-ecr.bsky.social @kprather.bsky.social @amandafrossard.bsky.social

Finding observations like these are valuable to distinguish controlling parameters in a cloud's evolution and therefore improve our understanding how we can better model them in GCMs among other aspects.
#atmoschem #clouds
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