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Mikael Ehn

@mikaelehn.bsky.social
428 followers 159 following 17 posts

Professor in Atmospheric Physical Chemistry, University of Helsinki. Not an active poster, but hoping this will be the new place to discover what other scientists are doing.

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Reposted by Mikael Ehn
Mika Rantanen @mikarantane.bsky.social · 11/09/2026
Job alert: full professorship in meteorology in the University of Helsinki! New position in dynamic meteorology, synoptic-scale meteorology and numerical weather prediction. The vacancy has been opened due to the passing of Dr. Victoria Sinclair. Details: jobs.helsinki.fi/job/Helsinki...
jobs.helsinki.fi
Professor/Associate or Assistant Professor, Meteorology
Professor/Associate or Assistant Professor, Meteorology
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Andrew Dessler @andrewdessler.com · 03/08/2026
This is one of the worst plots in climate science. It purports to show that the 1930s were much much hotter than present day.
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Zeke Hausfather @zekehausfather.com · 10/07/2026
Why is AC so rare in much of Europe? Well, until recently it simply wasn't hot enough to need it. Here is the average number of days above 30C (86F) for major cities over time:
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Mikael Ehn @mikaelehn.bsky.social · 03/06/2026
University of Helsinki is hiring 30 new doctoral researchers in interdisciplinary research areas "to address major global challenges such as climate change, biodiversity loss, and infectious diseases". Hope we get a lot of great applicants! www.helsinki.fi/en/research/...
helsinki.fi
RESDOC Project – Training Doctoral Excellence for Resilient and Just Future | University of Helsinki
RESDOC (Resilient and Just Systems Doctoral Project) is an international doctoral training project at the University of Helsinki in Finland. It brings together interdisciplinary and cross-sectoral res...
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Reposted by Mikael Ehn
James Allan @jamesallanatmos.bsky.social · 02/06/2026
I'd observe the 'Mandela effect' is alive and well in climate change denial, based on a range of demonstrably false statements that are espoused as fact that I can only assume have done the rounds in the echo chambers. How many of these have you heard stated as fact? 🧵 (1/8)
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Joel Thornton @atmostaj.bsky.social · 23/05/2026
No slip condition
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Jose-Luis Jimenez @jljcolorado.bsky.social · 09/05/2026
Of course #hanta is most likely airborne But that doesn't matter. The key is that it is not very contagious. Tuberculosis is exclusively airborne. But we don't have a rapidly spreading pandemic where everybody gets infected in months. Hantavirus is much less contagious.
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Reposted by Mikael Ehn
CoastClim @coastclim.bsky.social · 10/02/2026
New publication!🌥️ Maija Peltola et al. have measured new particle formation and aerosol properties at the CoastClim coastal atmospheric observatory. The fascinating results showed e.g. new particle formation at the coast occurred roughly as often as in a boreal forest. 👉 doi.org/10.5194/acp-...
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Mikael Ehn @mikaelehn.bsky.social · 27/11/2025
Before you start getting distracted by the holiday season, plan for 2026 by noting that we are again convening this session on atmospheric organics at #EGU26.
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Mikael Ehn @mikaelehn.bsky.social · 26/11/2025
Over the last years I have shifted efforts towards the coastal environment, working together with ecologists and biogeochemists. Has been really exciting to learn new things, and now we even have a first publication out describing the atmospheric observations we have set up at our coastal station.
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Philipp Heimberger @heimbergecon.bsky.social · 18/11/2025
"academic publishing is dominated by profit-oriented, multinational companies for whom scientific knowledge is a commodity to be sold back to the academic community who created it... The dominant four collectively generated... $12 billion in profits between 2019 and 2024."
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Mikael Ehn @mikaelehn.bsky.social · 30/09/2025
This work started already pre-covid, which makes me even happier to see it finally in print. Thanks to @ayanezserrano.bsky.social for tremendous leadership in pushing it all the way through!
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Ana María Yáñez Serrano @ayanezserrano.bsky.social · 26/09/2025
Happy to announce that our paper on "Unaccounted impacts of diterpene emissions on atmospheric aerosol loadings" has been published after years of efforts. Thank you!@mikaelehn.bsky.social @jpreixach.bsky.social @olgagarmash.bsky.social @apraplan.bsky.social @heidihellen.bsky.social rdcu.be/ezAYI
rdcu.be
Unaccounted impacts of diterpene emissions on atmospheric aerosol loadings
Communications Earth & Environment - Diterpenes are an underestimated source of secondary organic aerosol, accounting for up to 13% of the secondary organic aerosol burden from isoprene,...
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Delphine Farmer @chemdelphine.bsky.social · 21/09/2025
A rare bloom of Cosmo, CSU’s corpse plant, gave my group (Rose Rossell and @chemj.bsky.social) the chance to study corpse flower emissions in a fun collaboration with Tofwerk. Turns out to be an interesting, if stinky, story of pollination chemistry…
theconversation.com
How a corpse plant makes its terrible smell − it has a strategy, and its female flowers do most of the work
When a corpse flower bloomed on campus, atmospheric scientists got to work. What they discovered provides new evidence about the unique pollination strategies of a very unusual flower.
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Alf Norkko @alfnorkko.bsky.social · 07/06/2025
Det är dags för Finland och Sverige att ta FNs havskonferens på allvar! @tvarminne.bsky.social @ostersjocentrum.bsky.social @coastclim.bsky.social @balticseacentre.bsky.social @helsinki.fi www.hbl.fi/2025-06-07/f...
hbl.fi
DEBATT: Finland och Sverige måste sätta ett friskt hav främst
Ekologisk hållbarhet är en förutsättning för ekonomiska och sociala värden i haven, skriver Alf Norkko och Christoph…
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Mikael Ehn @mikaelehn.bsky.social · 05/06/2025
Sad I didn't manage to go to there myself this time, but thanks to Mace Head team for hosting these campaigns!
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Joel Thornton @atmostaj.bsky.social · 15/05/2025
There is some "amazing stuff" in here on Climeworks and carbon capture / carbon offsets model more generally. brief🧵 after the caveat that I have no idea if what is reported is true (but it mostly doesn't matter whether/if the numbers are off by >10x)
heimildin.is
Climeworks’ capture fails to cover its own emissions
The carbon capture company Climeworks only captures a fraction of the CO2 it promises its machines can capture. The company is failing to carbon offset the emissions resulting from its operations – wh...
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Mikael Ehn @mikaelehn.bsky.social · 23/04/2025
EGU coming up next week! See below for details on our session on atmospheric organics. Hope to see many of you there!
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Nature Geoscience @natgeosci.nature.com · 03/04/2025
⚒️ Article: High sensitivity of cloud formation to aerosol changes @annelev.bsky.social @harrikokkola.bsky.social www.nature.com/articles/s41...
nature.com
High sensitivity of cloud formation to aerosol changes - Nature Geoscience
In situ observations indicate a greater susceptibility of cloud droplet number to cloud condensation nuclei than is estimated from satellite observations, which suggests that aerosols exert a stronger...
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European Geosciences Union (EGU) @egu.eu · 03/03/2025
Hello Bluesky! EGU is pleased to be able to activate our account here, and share all the exciting news about the upcoming General Assembly: #EGU25, our #OpenAccess publications and more! Several of our Divisions will be making the move over from Twitter/X too, so keep an eye out for your favourites!
Blue background with yellow EGU logo and text that reads "European Geosciences Union".
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Colette Heald @coletteheald.bsky.social · 06/01/2025
Just over a week until EGU abstract deadline (Jan 15)! Come join us to learn about atmospheric organics! Featuring invited speakers @riikkarinnan.bsky.social and Matthew Coggon.
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Mikael Ehn @mikaelehn.bsky.social · 12/11/2024
EGU 2025 coming up next spring, check out our session on atmospheric organics!
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Mikael Ehn @mikaelehn.bsky.social · 21/03/2024
My postdoc Jian Zhao did a great job in figuring out how to improve the performance of the vaporization inlet for aerosols (VIA). One of these days we need to do a direct comparison with the EESI-TOF to compare spectra and sensitivities for online detection of SOA.
amt.copernicus.org
Characterization of the Vaporization Inlet for Aerosols (VIA) for online measurements of particulate highly oxygenated organic molecules (HOMs)
Abstract. Particulate matter has major climate and health impacts, and it is therefore of utmost importance to be able to measure the composition of these particles to gain insights into their sources...
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Mikael Ehn @mikaelehn.bsky.social · 12/03/2024
Can we, in real-time, deduce the ozone formation regime by measuring highly oxygenated organics (HOM)? In theory, yes. In a simple lab system, yes. In ambient air, we are still looking into it. In any case, since HOM were discovered, we have thought about these links, so was nice to now test it.
acp.copernicus.org
On the potential use of highly oxygenated organic molecules (HOMs) as indicators for ozone formation sensitivity
Abstract. Ozone (O3), an important and ubiquitous trace gas, protects lives from harmful solar ultraviolet (UV) radiation in the stratosphere but is toxic to living organisms in the troposphere. Addit...
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Colette Heald @coletteheald.bsky.social · 18/12/2023
Now that AGU has wrapped up, time to start thinking about EGU in April! Abstracts are due Jan 10. Consider submitting to our session on organics: meetingorganizer.copernicus.org/EGU24/sessio...
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Paul Wennberg @paulowennberg.bsky.social · 03/12/2023
pubs.acs.org/doi/full/10....
pubs.acs.org
Let’s Abandon the “High NOx” and “Low NOx” Terminology
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Reposted by Mikael Ehn
Colette Heald @coletteheald.bsky.social · 03/11/2023
If you are interested in atmospheric organics and conferences in Vienna, please consider submitting an abstract to our session at EGU24! meetingorganizer.copernicus.org/EGU24/sessio...
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