iiinova — where your digital self keeps evolving

Sasu Karttunen @skarttunen.me · 03/09/2026

I’m happy to share that I’ve started a new position as a Scientist at SRON Space Research Organisation Netherlands! I will be working with satellite observations of greenhouse gases, focusing on development of methods for quantification of point-source emissions. Excited for this next step!

A photograph of the SRON office building in Leiden, looking at the main entrance.

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Sasu Karttunen @skarttunen.me · 24/08/2026

Our new preprint is out! Here, we provide independent support for decadal decline in low cloud cover over land and coastal areas as seen on satellite and reanalysis records using lidar ceilometer observations. Comments much appreciated! #clouds #climate #remotesensing #lidar doi.org/10.31223/X56...

doi.org

Independent lidar observations support declining low cloud cover trends seen in satellite and reanalysis records

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Reposted by Sasu Karttunen

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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Sasu Karttunen @skarttunen.me · 20/01/2026

There is an urgent need to switch to Europe-based communication, cloud and compute platforms in Europe. The extent of which European public institutions (incl. universities) rely on US tech companies is a serious risk for all of these institutions and the safety of the European population.

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Reposted by Sasu Karttunen

UrbanAIR Project @urbanair.bsky.social · 13/01/2026

🧠 What counts as "extreme" heat? Is it a policy threshold, or the moment a resident can't breathe safely? At UrbanAIR WP5, we’re bridging the gap between hazard simulation and lived experience in Barcelona & Antwerp. 🧵 (1/3) #UrbanAIR #ClimateSci #DigitalTwin

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Sasu Karttunen @skarttunen.me · 05/01/2026

... and an hour later we have beautiful winter sunshine! The Dutch weather never lets you know its next move!

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Sasu Karttunen @skarttunen.me · 05/01/2026

A little snow this morning in Delft and much of the NL! The NL transport system is not happy though. Much of the NS rail lines especially around Amsterdam are inoperable. Traffic is a bit of a chaos as I've heard and the cyclists are struggling. No winter tires of course!

TU Delft EEMCS faculty building in snowfall.

The current situation on the NL railway tracks, showing many lines inoperable.

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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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Reposted by Sasu Karttunen

Atte Harjanne @atteharjanne.vihreat.fi · 05/08/2025

Jos ei usko ilmastonmuutokseen, niin miksi on niin kova tarve hävittää todisteet siitä? Pimeää, kyynistä ja tuhoisaa menoa. futurism.com/white-house-...

futurism.com

White House Orders NASA to Destroy Important Satellite

The White House has instructed NASA employees to destroy two major, climate change-focused satellite missions.

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Sasu Karttunen @skarttunen.me · 26/05/2025

The huge inflation in the usage of these words in scientific literature is appalling. Science should have better self-esteem and not fall into LinkedIn-speech (although the trend started much before LinkedIn) to justify their work. Not saying that I've been any better at this.

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Reposted by Sasu Karttunen

Philippe Papin @pppapin.bsky.social · 09/05/2025

This is a seismic gut punch to the weather enterprise. It is impossible to overstate how important @unidata.bsky.social is in implementing many datasets/libraries (LDM, netCDF, THREDDS, metPy) we currently use in meteorological research & operations. www.unidata.ucar.edu/blogs/news/e...

unidata.ucar.edu

NSF Unidata Pause in Most Operations

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Sasu Karttunen @skarttunen.me · 25/04/2025

I'm happy to share that I've completed my PhD in meteorology!🥳 On Tuesday, I successfully defended my thesis "Modelling and measuring transport processes within urban surface layer at high spatio-temporal resolutions" at the Faculty of Science of @helsinki.fi . Thanks to everyone involved!

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Sasu Karttunen @skarttunen.me · 13/03/2025

Dear publishers, By clicking "Download PDF", I don't mean that I want to open the article in your slow, impractical, and overall just useless online viewer/reader. I just want to get the PDF. Sincerely, I think almost every researcher in the world.

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Sasu Karttunen @skarttunen.me · 17/02/2025

I’m happy to share that I’ve started in a new position as Research Associate at Bern University of Applied Sciences BFH! 🇨🇭 I'm working on the UrbanAIR project (www.urbanair-project.eu), focusing on urban heat and clouds, using remote sensing and data driven methods.

A picture of the facade of the building for the School of Engineering and Computer Science at Bern University of Applied Sciences.

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Sasu Karttunen @skarttunen.me · 29/01/2025

I finally submitted my PhD thesis "Modelling and measuring transport processes within the urban surface layer at high spatio-temporal resolutions" for examination a week ago on Tuesday. This also marks the end of my time at Univ. of Helsinki, I'm currently spending my remaining holidays in India!

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Sasu Karttunen @skarttunen.me · 03/01/2025

Check out our new preprint on Geoscientifc Model Development on SLUrb, a single-layer urban canopy model for PALM. SLUrb allows for representing urban surfaces with non-building-resolving grids in PALM, extending PALM's urban capabilities to O(10 m) resolutions. gmd.copernicus.org/preprints/gm...

gmd.copernicus.org

PALM-SLUrb v24.04: A single-layer urban canopy model for the PALM model system – Model description and first evaluation

Abstract. Urban areas are recognized as critical zones for climate research due to the high number of people living in these areas and their significant impacts on local and regional climates. However...

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Sasu Karttunen @skarttunen.me · 27/11/2024

❓ Are you looking for a driven problem solver, who embraces novel challenges, and knows how to draw insights from terabyte-scale n-dimensional numerical data? ✅ If yes, hit me up with a message! Find out more on LinkedIn: www.linkedin.com/posts/sasu-k... #datascience #urbanclimate #meteorology

linkedin.com

Sasu Karttunen on LinkedIn: CV, Sasu Karttunen, Nov 27, 2024

❓ Are you looking for a driven problem solver, who embraces novel challenges, and knows how to draw insights from terabyte-scale n-dimensional numerical…

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Sasu Karttunen @skarttunen.me · 08/10/2024

✨I'm looking for a new job for 2025!✨ Job titles I'm interested in include scientist, data scientist, meteorologist, specialist and all their variations. My key skills are in data science, meteorology, model development and research. More on LinkedIn: www.linkedin.com/posts/sasu-k...

linkedin.com

Sasu Karttunen on LinkedIn: CV of Sasu Karttunen (4 Oct 2024)

⭐ I'm open to new opportunities! ⭐ Some of the job titles I'm interested in include scientist, data scientist, meteorologist, specialist and all their…

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Sasu Karttunen @skarttunen.me · 05/12/2023

The energy balance closure of the model can be written like this. This represents all the flows of energy from or to the model and all the places where it can be stored within the model. The sum of all the flows and storages should be zero, i.e. the energy should be conserved.

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Sasu Karttunen @skarttunen.me · 05/12/2023

After N hours (where N is far greater integer than I would be comfortable with) of debugging, my single-layer urban surface model for the PALM model system (a LES model, see palm.muk.uni-hannover.de) is 2 W/m^2 from full energy balance closure. So close!

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Sasu Karttunen @skarttunen.me · 04/12/2023

Mitään erikoista ei tapahtunut, mutta ennusteen epävarmuuden kommunikoinnissa medialle epäonnistuttiin jälleen. Oma henkilökohtainen mielipiteeni on, että Forecan blogikirjoitukset ovat nykyisellään huono lähde ja lähtökohta sääuutisointiin.

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Sasu Karttunen @skarttunen.me · 01/12/2023

Recently, there hasn't been much social media friendly stuff to post on my work as I've been implementing the remaining technical aspects and fixing bugs of my single-layer urban surface model implementation for the LES model PALM. Now I'm finally able proceed to sensitivity testing & evaluation!

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