VelleToll

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...

16.10.2025 13:46 — 👍 8    🔁 5    💬 0    📌 2

Emerging hemispheric asymmetry of Earth’s radiation | PNAS Twenty-four years of satellite observations from the Clouds and the Earth’s Radiant Energy System show a northern hemisphere (NH) minus southern he...

Emerging hemispheric asymmetry of Earth’s radiation | PNAS www.pnas.org/doi/10.1073/...

02.10.2025 09:49 — 👍 7    🔁 4    💬 0    📌 1

📢 Do not miss @cleancloud-he.bsky.social 's webinar with @harrikokkola.bsky.social

☁️ Distinguishing aerosol-cloud interactions amidst cloud variability

🗓️ Wednesday, Aug 27
🕐 13:00 CEST | 📍 Zoom: epfl.zoom.us/j/6156668523...

22.08.2025 10:28 — 👍 2    🔁 1    💬 0    📌 0

East Asian aerosol cleanup has likely contributed to the recent acceleration in global warming - Communications Earth & Environment Restrictions of atmospheric aerosol and precursor emissions in East Asia have contributed to the observed global surface warming acceleration since 2010, according to Earth System Model simulations is...

New article published today by my colleague @bjornsamset.bsky.social in Nature Comms: Earth and Environment. Evidence from eight Earth System Models that the reduction in East Asia's (primarily China's) air pollution is consistent with the sharper growth in warming.

14.07.2025 12:49 — 👍 47    🔁 21    💬 3    📌 3

East Asia: What is the link between air pollution and global warming? - NCAS Recent efforts to reduce air pollution in East Asia may have inadvertently contributed to a noticeable acceleration in global warming since 2010

Clean air, warmer planet? New study co-authored by NCAS's Laura Wilcox shows East Asia’s air pollution clean-up may have lifted a “cooling mask,” revealing more GHG warming.

A reminder that we must cut emissions and pollution - for climate and health.

ncas.ac.uk/east-asia-wh...

14.07.2025 09:39 — 👍 12    🔁 5    💬 1    📌 2

The pursuit of 1.5°C endures as a legal and ethical imperative in a changing world As the world nears 1.5°C of global warming, near-term emissions reductions and adequate adaptation become ever more important to ensure a safe and livable planet for present and future generations

What becomes of the 1.5°C goal now that global warming is approaching that level?🌍🔥🌡️

In a new @science.org Policy Forum we explain how the 1.5°C goal remains a critical legal & ethical benchmark, even as the world nears and may soon exceed 1.5°C of global warming🧵1/
www.science.org/doi/10.1126/...

23.06.2025 13:51 — 👍 68    🔁 43    💬 1    📌 8

Earth is more sensitive to greenhouse gases than we thought Our climate seems to be more sensitive to greenhouse gas emissions than some researchers had hoped, meaning the world will have to up its decarbonisation efforts

NewScientist story www.newscientist.com/article/2485...
on our paper: www.science.org/doi/10.1126/...

24.06.2025 16:24 — 👍 11    🔁 7    💬 0    📌 2

⚠️Global warming caused by humans is advancing at 0.27°C per decade – the highest rate since records began.

This is one of the indicators updated every year by over 60 international scientists in the annual Indicators of Global Climate Change report – published today. doi.org/10.5194/essd... /1

19.06.2025 08:21 — 👍 329    🔁 191    💬 8    📌 9

Observed trend in Earth energy imbalance may provide a constraint for low climate sensitivity models Climate models that give a low warming from increases in greenhouse gases do not match satellite measurements. Future warming will likely be worse than thought

Summary and some background on our recent Science paper: cicero.oslo.no/en/articles/...

13.06.2025 09:18 — 👍 12    🔁 7    💬 1    📌 1

Observed trend in Earth energy imbalance may provide a constraint for low climate sensitivity models Climate forcings by greenhouse gases and aerosols cause an imbalance at the top of the atmosphere between the net incoming solar radiation and outgoing longwave radiation from Earth. This Earth energy...

Happy to share our paper in ‪@science.org‬ 'Observed trend in Earth energy imbalance may provide a constraint for low climate sensitivity models' | Science www.science.org/doi/10.1126/...

12.06.2025 18:15 — 👍 105    🔁 37    💬 7    📌 4

I just published an explainer on aerosols and their role in the climate that I've been working on for the past few months! It includes both how aerosols work, how emissions have changed, and how thats driven recent warming: www.carbonbrief.org/...

10.06.2025 15:52 — 👍 350    🔁 140    💬 9    📌 8

Pan-Pacific low-frequency modes of sea level and climate variability Coastal sea level records suggest that Pacific Ocean sea level and climate trends are unlikely to persist over the coming decades.

While global mean sea level rise over recent decades has been driven mainly by greenhouse gases, the regional pattern in the Pacific has likely resulted from sulfate aerosol emissions - with important implications for the coming decades... www.science.org/doi/10.1126/...

02.06.2025 20:22 — 👍 47    🔁 15    💬 2    📌 2

Staying the course on climate action essential to EU security and competitiveness

In its new advice, the @esabcc.bsky.social reaffirms its recommendation for EU Policy: 90–95% net domestic reduction in greenhouse gas emissions by 2040 is both feasible and keeps the EU on a credible path to climate neutrality. Read the advice here: climate-advisory-board.europa.eu/news/staying...

02.06.2025 11:28 — 👍 22    🔁 18    💬 0    📌 9

Time series showing growing Earth energy imbalance (greater heating) this century

Earth's energy imbalance needs to decline to stabilise global temperatures but it is growing

The doubling of the rate of global heating in recent decades has surprised the scientific community so needs to be better understood yet our capability to measure Earth's energy imbalance is at risk: doi.org/10.1029/2024...

12.05.2025 09:48 — 👍 74    🔁 40    💬 3    📌 2

Aerosol-Cloud-Climate interactions | Velle Toll Climate Research Group

The full text of the paper is now available from my web page sisu.ut.ee/velle-toll/

24.11.2024 17:51 — 👍 3    🔁 0    💬 0    📌 0

Factories trigger local snowfall and reduce cloud cover
New @sciencemagazine
science.org/doi/10.1126/science.adl0303

14.11.2024 20:58 — 👍 5    🔁 0    💬 1    📌 0