Currently at the annual meeting of the "Arctic amplification" collaborative research project. Discussion on how increases in convection in the Arctic make it more "tropical" with warming. ac3-tr.de funded by @dfg.de, partners @meteoleipzig.bsky.social, U Bremen, Köln, @awi.de, @tropos-de.bsky.social

In a UN speech today, President Trump said that "all of these [climate] predictions were wrong". Back in 2019 I led a research effort to digitize old climate model projections and assess how well they did. Turns out they got future warming pretty spot on!

Since one year, the Research Training Group "Economics of connected natural commons" studies the challenges of sustainably using ecosystems and the climate system as commons. We just come back from the first retreat between the 14 PhD candidates, advisers, and excellent invited external speakers.

The current Advanced Training Module on "Climate Attribution", joinly by our interdisciplinary research training group "Economics of Connected Natural Commons" and the Leipzig Graduate school on Clouds, aerosols and radiation sparked large interest: 65 PhD researchers from 7 countries!

Great piece from Nadir Jeevanjee. As a meteorologist I of course love it when forecasts prove correct but as a citizen I would have preferred it if climate change had been prevented on the basis of the forecasts

Cloud drop number is a key quantity to understand cloud processes. Getting it from satellites so far was very indirect. Gonzalez et al. @meteoleipzig.bsky.social @scadsai.bsky.social now created a machine-learning method to get it directly from satellite radiances ieeexplore.ieee.org/document/111...

I'm glad to contribute again!

Imagine all cars were electric, and then one Volkswagen engineer comes up with another idea … #EMobility

How does cloud drop size distribution respond to aerosol? Hengqi Wang, visiting PhD researcher from Tsinghua university, used new data from satellite measurements of polarization from SRON/Netherlands to quantify the effect. Offsets systematically 7% of the aerosol-cloud forcing. rdcu.be/ezaeX

As @pkrugman.bsky.social writes, this is a deliberate effort to destroy science.

Übersicht zum Thema Aerosole und Klima, gemeinsam mit Mira Pöhlker @tropos-de.bsky.social , deutschsprachig, an physik-interessierte Leserschaft gerichtet: Bessere Luftqualität erwärmt die Erde: Aerosole und Klima - Quaas - Physik in unserer Zeit onlinelibrary.wiley.com/doi/10.1002/...

We have a PhD position in Meteorology open at the University of Bergen. Join us to study the moisture transport in extratropical cyclone families using reanalysis data, water tracer simulations, and stable water isotopes. Application deadline 24 June 2025: www.jobbnorge.no/en/available...

This is great! And yes we should f***ing swear more about how we are still neither reducing global emissions to meet agreed targets nor adapting to increasing extreme weather already now happening

The people telling you climate change isn’t real would also like you to believe that paying rent on an empty building saves money www.nytimes.com/2025/05/16/n...

We will have talks from @andrewdessler.com, @drkatemarvel.bsky.social, @johnmoralestv.bsky.social, Kerry Emanuel, Bernadette Woods Placky, Ralph Keeling, Ben Santer, and many more! Sign up and learn more at wclivestream.com

Hommage aux chercheurs de l'Agence américaine d'observation océanique et atmosphérique (NOAA), licenciés en 2025 sous l’administration Trump. Merci pour votre travail en sciences du climat, votre engagement, vos découvertes. #StandUpForScience

Yes science is done by people not buildings but this should be halted. The enormous scientific success of GISS is not least thanks to its proximity to Columbia University, and the fantastic discussions in the seminar rooms on 2880 Broadway. I learned so much during stimulating research stays.

"misaligned with the President’s agenda" if you have few years to live and no other person is of interest to you, in particular not future generations. GFDL anticipates what is coming, with so many smart and brave scientists. We in Europe stand in solidarity with our colleagues and friends.

The 2026 budget passback plan calls for eliminating NOAA Research, the scientific backbone that keeps weather forecasts, alerts, and warnings accurate and effective. This would have disastrous consequences. Read the AMS statement, in partnership w/ @nwas.org: bit.ly/4cz2RtC

I think this is really a righteous, important and brave reply

Indeed an amazing improvement! We did a bike tour today with three kids, safe bike lanes everywhere in the city, and so much more green than several years ago!

BREAKING from @science.org: The Trump admin is seeking to kill nearly all climate research at NOAA, its climate science agency. Its near-final budget proposal would end all NOAA research labs, academic institutes, and regional climate centers. And it wants to fully end the NOAA Research division.

The proposed cuts to NOAA aren't just numbers on a budget—they're a direct threat to public safety. Protecting NOAA funding is about protecting your family, your community, and your future. Learn more about these dangerous cuts here: bit.ly/4iaKpJ2

@idiv-research.bsky.social welcome to Bluesky, our fantastic research centre on integrative biodiversity science 👍

Just published: Pristine oceans are a significant source of uncertainty in quantifying global cloud condensation nuclei (CCN). acp.copernicus.org/articles/25/...

Congratulations and kudos to the citizens of Paris for once again leading in improving quality of life, safety, air quality, creating niches for #biodiversity and adapting to #climatechange! There is a street near where we have the privilege to live for a few months. A role model for other cities!

Excellent opportunities for PhD projects in AI @scadsai.bsky.social @unileipzig.bsky.social some of which connected to #climate and #biodiversity applications. T12 looks at causal inference and visualisation linking fertilizers, biodiversity and climate

Do aerosols impact thunderstorms? A new study by Wright et al. in Atmos. Chem. Phys. in my opinion now shows convincing evidence that yes: lighning is reduced over shipping lanes following the desulfurisation of ship emissions. acp.copernicus.org/articles/25/...

#StandUpForScience in Paris

As the American Meteorological Society, the harm done to climate science by the Trump regime is severe. Full solidarity with all affected colleagues! We need you!

Le 7 mars, mobilisons-nous pour les sciences ! 🔬✊ En écho à Stand Up For Science (@standupforscience.bsky.social) et face aux menaces contre les institutions scientifiques, des actions auront lieu dans chaque ville universitaire de France. Infos & inscriptions 👉 standupforscience.fr

🚨 #NOAA is essential for weather forecasting, climate research, and public safety. AGU stands with the scientific community in urging Congress to protect and strengthen NOAA, not dismantle it. Our economy, environment, and safety depend on it.

Maybe a way to at least show our solidarity with our colleagues at NOAA who are so important for our field act.ucsusa.org/4kajJuk

Great to see this new endeavour on understanding the climate and biodiversity aspects of smoke and bioaerosols! And excellent how many additional ideas such as pyrocumulus or transport of smoke to the Arctic, amplifying climate change there, connect to this new Science Campus!

Just saw this interesting result in the publication alert from the AGU: Diurnal temperature range increased across the world since 1998. This corroborates the evidence about a strong climate effect of the aerosol emission trend reversal agupubs.onlinelibrary.wiley.com/doi/10.1029/...

Solar Radiation Modification: What’s at stake for society? In this webinar, we examine social science aspects of the #SRM debate. What are the perspectives and interests of some of the key stakeholders, such as the public, business and political leaders? Join us on 3rd Feb. 📲 bit.ly/4flGfMT

Interested in applying for an MSCA fellowship to work with me on regional climate change or extreme events? Or with my colleagues at @wegenercenter.bsky.social or the University? We offer a lot of support, e.g., a workshop: forschungsmanagement.uni-graz.at/en/msca-post... Just drop me an email.

Some days left to apply!

Solar radiation modification: What should Europe’s strategy be? What are #SRM technologies, what do we know about them, and what are they designed to do? What are the risks, and possible consequences? Join this webinar on 23rd Jan. Register here: bit.ly/4flGfMT

Webinar series following the Evidence review report on Solar radiation modification for the European Commission, open to everyone: 23 Jan, 15 CET. scientificadvice.eu/events/solar... 3 Feb, 15 CET. scientificadvice.eu/events/solar... 11 Mar, 14 CET. scientificadvice.eu/events/solar...

We have an exciting postdoc scientist opportunity in Leipzig: synthesis between economics, climate and biodiversity in terms of natural commons in our research training group "Economics of connected natural commons". See details here: uni-leipzig.b-ite.careers/jobposting/e...

The @unibremen.bsky.social and the Leibniz Centre for Tropical Marine Research are recruiting a cooperation professor in the subject area of Earth System Modelling and Tropical Coastal Systems. If you are interested then have a look at www.uni-bremen.de/en/universit...

Satellite measurements are very useful tools to learn about how clouds act in climate change. The interpretation requires inverse radiative transfer calculations. PhD researcher Jessenia Gonzalez now used machine learning to make this much faster. Excellent collaboration with @isp-uv-es.bsky.social

As the debate around solar radiation modification (SRM; aka geoengineering) intensifies, the European Commission asked about an evidence review report. Bottom line: SRM is no meaningful option to combat climate change. The debate helps to sharpen arguments. scientificadvice.eu/advice/solar...

Climate change and biodiversity loss are connected! This week we presented our ideas for a collaborative project to our national funding agency. Fingers crossed, we will know the outcome in May

#sDiv, iDiv's Synthesis Centre for Biodiversity just released its annual newsletter w call news, project insight & success stories & what is generally ongoing in the synthesis research world. Send me a PM w your email and I forward you the NL. Half of it is online here: www.idiv.de/newsletter/s...

☁️#Cloud processes, #aerosol-cloud interactions, 🧊ice nucleation... and much more: Today at 11 CET we are happy to host a special seminar with Dr. Donifan Barahona @ #NASAGoddard to talk about #AI in #climatemodels and discuss CleanCloud research. For more info: memento.epfl.ch/event/eess-t...

Dear American colleagues, Please be assured of the solidarity by us Europeans. We stand together defending our values as free science, a livable planet, and open international exchange.

When we emit gases or particles to the atmosphere, at short timescale it adjusts, for example the clouds. This may amplify or dampen the the Earth energy balance. New overview paper now out in AGU Advances from our CONSTRAIN EU project