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CERTAINTY-ACI

@certainty-aci.bsky.social
155 followers 229 following 83 posts

CERTAINTY is a research project. It aims to deliver the knowledge and models that provide improved confidence and representation of the role of cloud–aerosol-radiation interactions in climate and weather. Funded by Horizon Europe.

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CERTAINTY-ACI @certainty-aci.bsky.social · 08/09/2026
The new 2026 Air Quality and Climate Bulletin is out! | 📖 Have a look at the bulletin, and in particular at the article on aerosol–cloud interactions by Jennie Thomas, Harri Kokkola and Paolo Laj.
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CERTAINTY-ACI @certainty-aci.bsky.social · 01/09/2026
Can rime splintering explain ice production in Arctic mixed-phase clouds? ➡️ Read the publication: acp.copernicus.org/articles/26/... ➡️ Learn more about CERTAINTY's recent results: certainty-aci.eu/news/
acp.copernicus.org
Can rime splintering explain the ice production in Arctic mixed-phase clouds?
Abstract. Secondary ice production (SIP) can increase ice crystal number concentration (ICNC) by several orders of magnitude, particularly in clean clouds with low concentrations of ice-nucleating par...
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CERTAINTY-ACI @certainty-aci.bsky.social · 27/08/2026
Marine gases influence the Arctic climate through aerosols and clouds Summary: certainty-aci.eu/news-marine-... Publication: agupubs.onlinelibrary.wiley.com/doi/10.1029/...
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CERTAINTY-ACI @certainty-aci.bsky.social · 25/08/2026
ORCESTRA is an international field campaign dedicated to advancing our understanding of tropical deep convection (the towering clouds and thunderstorms that transport heat, moisture & energy through the tropical atmosphere) and its role in Earth’s climate system 🔍 certainty-aci.eu/news-orcestr...
Figure: DOI: 10.16993/tellus.4123
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CERTAINTY-ACI @certainty-aci.bsky.social · 24/07/2026
⏯️ The recording of our webinar "New aerosol and surface reflectance products from novel satellite observations and their synergies" is now available online: www.youtube.com/watch?v=RuWX... 🙏 A big thank you to Oleg Dubovik for sharing his expertise and insights, and to Anna Gialitaki for moderating
youtube.com
New aerosol and surface reflectance products from novel satellite observations and their synergies
YouTube video by CERTAINTY-ACI
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CERTAINTY-ACI @certainty-aci.bsky.social · 11/06/2026
📢 One Week to Go! certainty-aci.eu/events/ ⬇️
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CERTAINTY-ACI @certainty-aci.bsky.social · 02/06/2026
Have you ever wondered how ice forms in clouds? Watch Marios Chatziparaschos and @drgilbz.bsky.social to find out! ⏯️ www.youtube.com/watch?v=5FRL...
youtube.com
These tiny particles control how clouds freeze
YouTube video by CERTAINTY-ACI
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CERTAINTY-ACI @certainty-aci.bsky.social · 27/05/2026
📢 CERTAINTY & AIRSENSE WEBINAR New aerosol and surface reflectance products from novel satellite observations and their synergies 🌍 🛰️ 🎤 Oleg Dubovik (CNRS, Université de Lille) Moderator: Anna Gialitaki (National Observatory of Athens) 🗓️ Thursday, June 18 🕐 14:00 CEST 💻 Zoom: lnkd.in/eGrqEqjp
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CERTAINTY-ACI @certainty-aci.bsky.social · 21/05/2026
☁️ 🌏 How do clouds and aerosols influence our climate? In this interview conducted by @drgilbz.bsky.social, Georgios Dekoutsidis from the CERTAINTY project explains how he studies complex atmospheric processes using data collected during the PERCUSION campaign. www.youtube.com/watch?v=AYCF...
youtube.com
What scientists can learn by flying through clouds
YouTube video by CERTAINTY-ACI
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CERTAINTY-ACI @certainty-aci.bsky.social · 11/05/2026
Despite their tiny size and small number, ice nucleating particules have a huge impact on global weather and climate through their influence on clouds. @drgilbz.bsky.social & Marios Chatziparaschos ▶️ www.youtube.com/watch?v=5FRL...
youtube.com
These tiny particles control how clouds freeze
YouTube video by CERTAINTY-ACI
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CERTAINTY-ACI @certainty-aci.bsky.social · 07/05/2026
A recent publication in the @tellusjournal.bsky.social by Bjorn Stevens et al. provides an overview of the ORCHESTRA field campaign 📄 tellusjournal.org/articles/10....
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CERTAINTY-ACI @certainty-aci.bsky.social · 04/05/2026
We’re looking forward to sharing our latest results at EGU 2026. Come see sessions organized by CERTAINTY & the presentations from team members at these sessions: certainty-aci.eu/egu26/
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CERTAINTY-ACI @certainty-aci.bsky.social · 29/04/2026
[New publication] 🌍 Desert dust exerts twice the longwave radiative heating estimated by climate models Jasper F. Kok, Ashok Gupta, Amato Evan, Carlos Pérez García-Pando, et al. www.nature.com/articles/s41...
nature.com
Desert dust exerts twice the longwave radiative heating estimated by climate models - Nature Communications
This study shows that atmospheric desert dust keeps about twice as much infrared heat from escaping to space as climate models predict, highlighting that improving dust in models could sharpen weather...
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Reposted by CERTAINTY-ACI
Dr Ella Gilbert @drgilbz.bsky.social · 28/04/2026
Clouds can impact climate massively - and it turns out, their impact changes between day and night. 🌜🌞 Great to chat with Geoff Pugsley and Ed Gryspeerdt about their recent work on nighttime cloud impacts.
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CERTAINTY-ACI @certainty-aci.bsky.social · 28/04/2026
⏰ Human activity is changing clouds… at one particular time of day What time is it? Watch the video with @drgilbz.bsky.social Geoffrey Pugsley & Edward Gryspeerdt to find out! ▶️ www.youtube.com/watch?v=HK9h...
youtube.com
Human activity is changing clouds… at one particular time of day
YouTube video by CERTAINTY-ACI
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CERTAINTY-ACI @certainty-aci.bsky.social · 22/04/2026
Why aerosols matter 🌥️ What happens to our climate if the ingredients of clouds change? That question is asked in a recent paper written by CERTAINTY scientists. 🎤 @drgilbz.bsky.social & @annelev.bsky.social ▶️ www.youtube.com/watch?v=0B6S...
youtube.com
Our climate is surprisingly sensitive to these tiny particles
YouTube video by CERTAINTY-ACI
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Reposted by CERTAINTY-ACI
Dr Ella Gilbert @drgilbz.bsky.social · 21/04/2026
Made some videos with @certainty-aci.bsky.social about the climate impact of clouds and aerosols. And you can check out the first one here 👇
youtube.com
Our climate is surprisingly sensitive to these tiny particles
YouTube video by CERTAINTY-ACI
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CERTAINTY-ACI @certainty-aci.bsky.social · 16/04/2026
The EC–ESA Aerosol Cloud Cluster brings together over 220 researchers across 40 institutions, uniting projects like CleanCloud, CERTAINTY, and AIRSENSE to improve climate predictions and support more effective climate action. More info: certainty-aci.eu/ec-esa-aeros...
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CERTAINTY-ACI @certainty-aci.bsky.social · 14/04/2026
[New publication] ☁️ 🌳 Beyond cloud cover: Low- and high-altitude clouds have distinct impacts on tree sap flow and transpiration ✍️Talvinen, S., Salmon, Y., Guttierez Lopez, J., et al. www.sciencedirect.com/science/arti...
sciencedirect.com
Beyond cloud cover: Low- and high-altitude clouds have distinct impacts on tree sap flow and transpiration
Transpiration drives up to 40 % of terrestrial precipitation, with forests playing a critical role. This study combines long-term sap flow measurement…
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CERTAINTY-ACI @certainty-aci.bsky.social · 03/04/2026
From Canada to India: the far-reaching impact of 2023’s wildfire smoke 🔥 ✒️ Rosu Iulian-Alin et al. ➡️ Read the publication: www.nature.com/articles/s44... ➡️ Find out more on the climate effects of the Canadian wildfires: certainty-aci.eu/news-climate...
nature.com
Severe rapid indian monsoon weakening due to emissions from extreme Canadian wildfires - npj Natural Hazards
npj Natural Hazards - Severe rapid indian monsoon weakening due to emissions from extreme Canadian wildfires
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CERTAINTY-ACI @certainty-aci.bsky.social · 03/04/2026
[New publication] 📄 Implementation of primary and secondary ice production in EC-Earth3-AerChem: global impacts and insights ✒️ Montse Costa Surós et al. ➡️ Read the paper: acp.copernicus.org/articles/26/... ➡️ Discover all EC-ESA Aerosol Cloud Cluster publications: certainty-aci.eu/ec-esa-aeros...
acp.copernicus.org
Implementation of primary and secondary ice production in EC-Earth3-AerChem: global impacts and insights
Abstract. Clouds and aerosol–cloud interactions remain major sources of uncertainty in climate projections. Here, we improve the representation of mixed-phase clouds (MPCs) in the EC-Earth3-AerChem Ea...
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CERTAINTY-ACI @certainty-aci.bsky.social · 18/03/2026
Two recent studies co-authored by CERTAINTY members are improving our understanding of how the polar oceans, sea ice, and the associated atmospheric particles form and behave in polar regions and influence clouds. ➡️ certainty-aci.eu/contribution...
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CERTAINTY-ACI @certainty-aci.bsky.social · 17/03/2026
Great to come together with such a fantastic team at our Annual Meeting as we reflect on our progress and set the course for Year 3 and beyond! @ilmatieteenlaitos.fi
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CERTAINTY-ACI @certainty-aci.bsky.social · 13/03/2026
🌍 Better weather and climate projections mean smarter, safer, and more resilient decisions, for Europe and beyond ▶️ www.youtube.com/watch?v=ji3z...
youtube.com
Aerosol–Cloud Interactions Are Key to Climate Resilience
YouTube video by CleanCloudProject
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CERTAINTY-ACI @certainty-aci.bsky.social · 12/03/2026
Explore how clouds form, the crucial role aerosols play in weather and climate, and why understanding these tiny particles remains one of society’s biggest scientific challenges. ▶️ www.youtube.com/watch?v=RehM...
youtube.com
Aerosol Cloud Interactions
YouTube video by CleanCloudProject
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CERTAINTY-ACI @certainty-aci.bsky.social · 10/03/2026
Do we really know by how much ellipsoidal shapes enhance the extinction of solar radiation by dust? By Obiso et al. 🔍 doi.org/10.5281/zeno...
doi.org
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CERTAINTY-ACI @certainty-aci.bsky.social · 09/03/2026
The EC-ESA Aerosol Cloud Cluster addresses the biggest uncertainty in regional climate prediction: aerosol-cloud interactions. It unites +220 researchers linking EU projects CleanCloud & CERTAINTY with ESA’s AIRSENSE to advance climate modeling & mitigation 🔗 www.youtube.com/watch?v=CPHt...
youtube.com
What is the EC ESA Aerosol Cloud Cluster?
YouTube video by CleanCloudProject
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Reposted by CERTAINTY-ACI
Ulas Im @ulasim77.bsky.social · 27/02/2026
Our perspective paper on aerosol cloud interactions is featured in Eos.com as editor ‘s highlight 👇 @cleancloud-he.bsky.social @certainty-aci.bsky.social Understanding Aerosol-Cloud Interactions is Pivotal for Improving Climate Predictions eos.org/editor-highl...
eos.org
Understanding Aerosol-Cloud Interactions is Pivotal for Improving Climate Predictions - Eos
Global cooperation and knowledge sharing are essential to improve our understanding of cloud formation and evolution through aerosol-cloud interaction.
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CERTAINTY-ACI @certainty-aci.bsky.social · 23/02/2026
[EC–ESA Aerosol Cloud Cluster Activity] ⁉️Uncertainty in how air pollution interacts with clouds is the largest source of uncertainty in near-term climate projections 🔍New policy brief explains why reducing the uncertainty is essential for effective climate policy certainty-aci.eu/policy-brief...
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Reposted by CERTAINTY-ACI
Ulas Im @ulasim77.bsky.social · 22/02/2026
Excited to announce our new publication on #aerosol #cloud #interactions 👇 Proud to lead this perspective with great experts from the field @cleancloud-he.bsky.social @certainty-aci.bsky.social #ESA-AIRSENSE agupubs.onlinelibrary.wiley.com/doi/full/10....
agupubs.onlinelibrary.wiley.com
Aerosol‐Cloud Interactions: Overcoming a Barrier to Projecting Near‐Term Climate Evolution and Risk
Aerosol-cloud interactions (ACI) remain a barrier to provide precise and actionable advice to policy makers at global and regional levels We recommend improving satellite retrievals, expanding gr...
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CERTAINTY-ACI @certainty-aci.bsky.social · 11/02/2026
[New EC-ESA Aerosol Cloud Cluster publication] Aerosol-Cloud Interactions: Overcoming a Barrier to Projecting Near-Term Climate Evolution and Risk By Im et al. ➡️ agupubs.onlinelibrary.wiley.com/doi/10.1029/... @cleancloud-he.bsky.social
agupubs.onlinelibrary.wiley.com
Aerosol‐Cloud Interactions: Overcoming a Barrier to Projecting Near‐Term Climate Evolution and Risk
Aerosol-cloud interactions (ACI) remain a barrier to provide precise and actionable advice to policy makers at global and regional levels We recommend improving satellite retrievals, expanding gr...
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CERTAINTY-ACI @certainty-aci.bsky.social · 22/01/2026
📄🔥 Diverse aerosol effects revealed during wildfire and dust storm events in Ukraine in April 2020 ✍️ Savenets, M., Mahura, A., Nuterman, R., Kulmala, M., Petäjä, T. Atmospheric Pollution Research, 2026, 102906, ISSN 1309-1042 www.sciencedirect.com/science/arti...
sciencedirect.com
Diverse aerosol effects revealed during wildfire and dust storm events in Ukraine in April 2020
Aerosol particles are significant drivers of meteorological phenomena, especially during high concentration events such as wildfires and dust storms. …
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CERTAINTY-ACI @certainty-aci.bsky.social · 05/01/2026
📄New publication: Regional climate imprints of recent historical changes in anthropogenic Near Term Climate Forcers ✍️ Santos-Espeso, A. et al. ➡️ esd.copernicus.org/articles/16/... ➡️ all CERTAINTY papers: certainty-aci.eu/publications/
esd.copernicus.org
Regional climate imprints of recent historical changes in anthropogenic Near Term Climate Forcers
Abstract. Near-Term Climate Forcers (NTCFs) play a crucial role in shaping Earth's climate, yet their effects are often overshadowed by long-lived greenhouse gases (GHGs) when addressing climate varia...
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CERTAINTY-ACI @certainty-aci.bsky.social · 04/12/2025
[Continuing collaboration with @cleancloud-he.bsky.social] ❄️ Efficient ice multiplication from freezing raindrop fragmentation 🖊️ Nils Pfeifer, Bernd Mom, Dmitri Moisseev, Susan Hartmann, Julian Meusel, Corinna Hoose & Maximilian Maahn 🔎 Read the publication: www.nature.com/articles/s43...
nature.com
Efficient ice multiplication from freezing raindrop fragmentation - Communications Earth & Environment
Drop fragmentation upon freezing is an efficient secondary ice process, contributing to cloud ice formation even at relatively high temperatures, according to quantitative analyses of ice crystals via...
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CERTAINTY-ACI @certainty-aci.bsky.social · 26/11/2025
🌗☁️Aerosols have an uncertain climate impact because they interact with clouds in complex ways, especially stratocumulus. These clouds behave differently by day and night, yet a new analysis by Pugsley et al. shows that the key processes actually occur at night: certainty-aci.eu/news-the-nig...
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CERTAINTY-ACI @certainty-aci.bsky.social · 17/11/2025
🇪🇺 🌎 Building Europe’s most ambitious joint effort to address one of the main knowledge gaps in climate science by advancing fundamental understanding of cloud–aerosol interactions Last week CERTAINTY, @cleancloud-he.bsky.social & @esa.int funded projects including AIRSENSE joined forces in Lausanne
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CERTAINTY-ACI @certainty-aci.bsky.social · 07/11/2025
[New publication] 📃 Secondary ice formation in cumulus congestus clouds: insights from observations and aerosol-aware large-eddy simulations ✒️ @silviamcalderon.bsky.social et al. ➡️ Paper: acp.copernicus.org/articles/25/... ➡️ All CERTAINTY publications: certainty-aci.eu/publications/
acp.copernicus.org
Secondary ice formation in cumulus congestus clouds: insights from observations and aerosol-aware large-eddy simulations
Abstract. Secondary ice production (SIP) was investigated in a cumulus congestus system observed during the Secondary Production of Ice in Cumulus Experiment (SPICULE) campaign. Large-eddy simulations...
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CERTAINTY-ACI @certainty-aci.bsky.social · 21/10/2025
Assessing the global contribution of marine aerosols, terrestrial bioaerosols, and desert dust to ice-nucleating particle concentrations ✍️ Marios Chatziparaschos et al. 🔍 acp.copernicus.org/articles/25/...
acp.copernicus.org
Assessing the global contribution of marine aerosols, terrestrial bioaerosols, and desert dust to ice-nucleating particle concentrations
Abstract. Aerosol–cloud interactions, particularly ice processes in mixed-phase clouds (MPCs), remain a key source of uncertainty in climate change assessments. This study introduces state-of-the-art ...
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Reposted by CERTAINTY-ACI
CleanCloud Project @cleancloud-he.bsky.social · 16/10/2025
Don’t miss Prof. Trude Storelvmo’s talk on Arctic mixed-phase #clouds, connecting insights from small-scale processses to large-scale #climate impacts. 🌍☁️ 📆 Wednesday 29 Oct at 1pm (CET) on Zoom! epfl.zoom.us/j/6156668523...
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CERTAINTY-ACI @certainty-aci.bsky.social · 02/10/2025
☁️ 🌲 Cumulus clouds amplify boreal forest photosynthesis A recent study by Ezhova et al., based on long-term observations in Finland, shows that, in boreal forests, organic aerosols enhance photosynthesis under cumulus clouds. 🔍 www.nature.com/articles/s43... 🔍 certainty-aci.eu/news/
nature.com
Organic aerosol enhances boreal forest photosynthesis under cumulus clouds - Communications Earth & Environment
Natural aerosols under cumulus clouds enhance diffuse radiation and therefore photosynthesis in boreal forests, increasing carbon uptake, according to analysis of atmospheric data from a forest site in southern Finland.
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CERTAINTY-ACI @certainty-aci.bsky.social · 29/09/2025
🌎🔥Roșu et al. found that the 2023 Canadian wildfires emissions caused widespread increases in aerosol concentrations across the Northern Hemisphere, leading to a measurable cooling of surface air temperatures 🔍 certainty-aci.eu/news-climate... 🔍 www.nature.com/articles/s44...
nature.com
Large-scale impacts of the 2023 Canadian wildfires on the Northern Hemisphere atmosphere - npj Clean Air
npj Clean Air - Large-scale impacts of the 2023 Canadian wildfires on the Northern Hemisphere atmosphere
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CERTAINTY-ACI @certainty-aci.bsky.social · 23/09/2025
Missed the great fireside chat with Gavin Pretor-Pinney & Edward Gryspeerdt on clouds? 🌥️ No worries, you can catch the replay here: ⬇️⬇️⬇️
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CERTAINTY-ACI @certainty-aci.bsky.social · 23/09/2025
🛳️ 🌎 Impacts of shipping fuel regulations on global warming 👉 Read the paper: www.nature.com/articles/s43... (Jianhao Zhang, Yao-Sheng Chen, Edward Gryspeerdt, Takanobu Yamaguchi & Graham Feingold) 👉 Discover more CERTAINTY web stories: certainty-aci.eu/news/
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CERTAINTY-ACI @certainty-aci.bsky.social · 19/09/2025
A recent study by Hermant, Huusko and Mauritsen shows that the direct radiative effect of aerosols has continued to strengthen, even as emissions declined, whereas the indirect effect has weakened in line with emissions. 🔍 Read a summary here: certainty-aci.eu/news-aerosol...
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CERTAINTY-ACI @certainty-aci.bsky.social · 17/09/2025
🚀 Coming up on 19 September 2025: a fireside chat on clouds and climate with Gavin Pretor-Pinney and Edward Gryspeerdt 🔗 Register now: luma.com/3wtgxi06
luma.com
Clouds & Climate: A Fireside Chat with Gavin Pretor-Pinney & Dr Ed Gryspeerdt · Luma
Asterisk Labs and the Cloud Appreciation Society are delighted to invite you to an online 'fireside chat' between Gavin Pretor-Pinney and Dr Ed…
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CERTAINTY-ACI @certainty-aci.bsky.social · 12/09/2025
☁️ Clouds & Climate: A Fireside Chat with Gavin Pretor-Pinney & Ed Gryspeerdt 🗓️ 19 Sept. 🕔 17:00–18:00 (GMT+2) 📍 Online luma.com/3wtgxi06 A special online fireside chat exploring the wonder of clouds & their vital role in the Earth’s climate system, bridging science, beauty & public engagement
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CERTAINTY-ACI @certainty-aci.bsky.social · 04/09/2025
[ 📣 New publication] Weak influence of anthropogenic emissions on aerosol, cloud, and rain in the wet season of the Amazon rainforest ✒️ Wang, X., Carslaw, K. S., Grosvenor, D. P., and Gordon, H. 🔗 acp.copernicus.org/articles/25/... 🔎 All CERTAINTY papers: certainty-aci.eu/publications/
acp.copernicus.org
Weak influence of anthropogenic emissions on aerosol, cloud, and rain in the wet season of the Amazon rainforest
Abstract. Anthropogenic emissions have been shown to affect new particle formation, aerosol concentrations, and clouds. Such effects vary with region, environmental conditions, and cloud types. In the...
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CERTAINTY-ACI @certainty-aci.bsky.social · 03/09/2025
📣 A new study examines the effects of the extreme 2023 Canadian wildfires using an Earth system model, comparing modelled atmospheric conditions with and without wildfire emissions. ✒️ Roșu et al. 🔎 www.nature.com/articles/s44... 🔎 All CERTAINTY publications: certainty-aci.eu/publications/
nature.com
Large-scale impacts of the 2023 Canadian wildfires on the Northern Hemisphere atmosphere - npj Clean Air
npj Clean Air - Large-scale impacts of the 2023 Canadian wildfires on the Northern Hemisphere atmosphere
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CERTAINTY-ACI @certainty-aci.bsky.social · 01/09/2025
[ 📣 Summer 2025 - Publication] Organic aerosol enhances boreal forest photosynthesis under cumulus clouds ☁️ ✒️ by Ekaterina Ezhova et al. 🔗 Read the paper here: www.nature.com/articles/s43...
nature.com
Organic aerosol enhances boreal forest photosynthesis under cumulus clouds - Communications Earth & Environment
Natural aerosols under cumulus clouds enhance diffuse radiation and therefore photosynthesis in boreal forests, increasing carbon uptake, according to analysis of atmospheric data from a forest site i...
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CERTAINTY-ACI @certainty-aci.bsky.social · 26/08/2025
⏰ Join us tomorrow ⏰ 📢 WEBINAR Distinguishing aerosol-cloud interactions amidst cloud variability 🗨️ @harrikokkola.bsky.social 🗓️ Wednesday, Aug 27 🕐 13:00 CEST | 📍 Zoom: epfl.zoom.us/j/6156668523... @cleancloud-he.bsky.social
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