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Mikael Ehn

@mikaelehn.bsky.social

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.

17 Posts427 Follower156 Folgt
Zeke Hausfather@zekehausfather.com · 2mo ago

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 · 4mo ago

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/...

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...

helsinki.fi

James Allan@jamesallanatmos.bsky.social · 4mo ago

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)

Jose-Luis Jimenez@jljcolorado.bsky.social · 5mo ago

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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CoastClim@coastclim.bsky.social · 7mo ago

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 · 10mo ago

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.

Colette Heald@coletteheald.bsky.social · 10mo ago

If you work on sources and impacts of VOCs (biogenic or anthropogenic) from measurement to modeling perspectives please submit an abstract to our atmospheric organics session at #EGU26! Our invited speakers are @dbm.bsky.social and @jacquirickard.bsky.social See you in Vienna! tinyurl.com/55vda8u7

Mikael Ehn@mikaelehn.bsky.social · 10mo ago

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.

CoastClim@coastclim.bsky.social · 10mo ago

🚨New publication Thakur et al present the comprehensive atmospheric observatory @tvarminne.bsky.social. Initial results: sea-air exchange of aerosol precursor gases, VOCs and CO2 at the coast are highly dynamic, influenced by meteorological and biological conditions. hdl.handle.net/10138/602793

Philipp Heimberger@heimbergecon.bsky.social · 10mo ago

"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 · 12mo ago

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!

Ana María Yáñez Serrano@ayanezserrano.bsky.social · 12mo ago

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

Ana María Yáñez Serrano@ayanezserrano.bsky.social · 12mo ago

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

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,...

rdcu.be

Delphine Farmer@chemdelphine.bsky.social · last yr.

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…

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.

theconversation.com

Joel Thornton@atmostaj.bsky.social · last yr.

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)

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...

heimildin.is

Mikael Ehn@mikaelehn.bsky.social · last yr.

EGU coming up next week! See below for details on our session on atmospheric organics. Hope to see many of you there!

Colette Heald@coletteheald.bsky.social · last yr.

I'm looking forward to EGU next week and seeing people - who will be there? If interested in Atmospheric Organics check out our oral session on Thursday and posters Friday morning (AS3.2). meetingorganizer.copernicus.org/EGU25/sessio... You can also find Yumin and Flossie presenting on their work:

European Geosciences Union (EGU)@egu.eu · 2y ago

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".
Mikael Ehn@mikaelehn.bsky.social · 3y ago

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.

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...

amt.copernicus.org

Mikael Ehn@mikaelehn.bsky.social · 3y ago

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.

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...

acp.copernicus.org