Johannes Quaas
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jquaas.bsky.social
Johannes Quaas
@jquaas.bsky.social
1.6K followers 260 following 76 posts

Theoretical Meteorology, Leipzig University
Clouds and climate, biodiversity and climate, aerosols and clouds

Videos
Environmental science 52%
Geology 19%
Posts Replies Media Videos

Reposted by Johannes Quaas

antjeweisheimer.bsky.social
Antje Weisheimer @antjeweisheimer.bsky.social · 7d
📢 Postdoc Opportunity to study large-scale dynamic and thermodynamic conditions influencing the risk of cyclones of tropical origin 🌀 reaching Western Europe
📍 Joint post: Universities of Oxford & Edinburgh
⏰ Apply by 15 Jan 2026 (noon GMT)

Details & apply 👉 my.corehr.com/pls/uoxrecru...
Job Details
my.corehr.com

Reposted by Peter Thorne, Adam H. Sobel

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · 8d
Attacking NCAR is enormously self-destructive for America. NCAR is the leading centre in weather and climate research in the world. We Europeans often travel to NCAR to collaborate, discuss and learn. Hurting the centre will cause damage that is irreversible for years to decades with global impact.
eos.org Eos @eos.org · 8d
To help #SaveNCAR, read our update below and visit this @aguscipolicy.bsky.social page, where you can find email text and a call script to share with your representatives. agu.quorum.us/campaign/151...

Reposted by Sonia I. Seneviratne, Johannes Quaas, Peter Thorne , and 1 more

eos.org
Eos @eos.org · 8d
To help #SaveNCAR, read our update below and visit this @aguscipolicy.bsky.social page, where you can find email text and a call script to share with your representatives. agu.quorum.us/campaign/151...

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · 14d
@meteoleipzig.bsky.social @tropos-de.bsky.social @ufz.de @idiv-research.bsky.social

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · 14d
A total of more than 30 early-career researchers and established researchers from economics, meteorology, and biology collaborate within ECO-N.

We seek to fill 14 funded doctoral researcher positions for the period September 2026 to August 2029, with envisaged extension to 2030.

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · 14d
ECO-N combines interdisciplinary research on how to sustainably use and conserve natural commons such as biodiverse forests, fertile soils, regional climate, or clean urban air, with a rigorous course programme providing disciplinary and interdisciplinary competencies.

Reposted by Paul Lehmann, Georg Weizsäcker

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · 14d
The DFG research training group on the Economics of Connected Natural Commons: Atmosphere and Biodiversity (ECO-N) at Leipzig University is happy to announce vacancies for another 14 doctoral researcher positions. www.eco-n.org
uni-leipzig.b-ite.careers/jobposting/9...
@unileipzig.bsky.social

Reposted by Johannes Quaas

meteoleipzig.bsky.social
Leipzig Institute for Meteorology @meteoleipzig.bsky.social · Nov 25
New paper alert: b.tellusjournals.se/articles/10....

Aerosols have an actual warming effect in the Arctic in winter: Changed dynamics via shift in the jet stream position (which in turn projects on the Arctic Oscillation index —> more positive)

@jquaas.bsky.social @khaustein.bsky.social
Exploring the Sensitivity of Arctic Winter Climate to Aerosol Loading as Simulated in CMIP6 | Tellus B: Chemical and Physical Meteorology
b.tellusjournals.se

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Nov 15
Fascinating image!

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Nov 14
Great study by our iDiv colleagues: biodiversity in forests helps to mitigate impacts of climate change
idiv-research.bsky.social iDiv Biodiversity Research @idiv-research.bsky.social · Nov 13
New study led by @lsachsenmaier.bsky.social @agwirthweigelt.bsky.social shows: forest stands made up of tree species with different water-use strategies (not just many species) grow better in drought years. #iDivResearch #Biodiversity
www.idiv.de/diverse-fore...
Diverse forests are more resistant to climate change
www.idiv.de

Reposted by Johannes Quaas, John Parker, Karl Andraczek , and 1 more

idiv-research.bsky.social
iDiv Biodiversity Research @idiv-research.bsky.social · Nov 13
New study led by @lsachsenmaier.bsky.social @agwirthweigelt.bsky.social shows: forest stands made up of tree species with different water-use strategies (not just many species) grow better in drought years. #iDivResearch #Biodiversity
www.idiv.de/diverse-fore...
Diverse forests are more resistant to climate change
www.idiv.de

Reposted by Johannes Quaas

janrosenow.bsky.social
Jan Rosenow @janrosenow.bsky.social · Nov 11
What if we had no electricity and everything ran on fossil fuels?

This ad keeps making me chuckle.

Enjoy if you have not seen it or rewatch as it is just gold.

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Nov 10
Dokumentation über Klima und Amazonas mit der super Kollegin Mira Pöhlker @tropos-de.bsky.social @meteoleipzig.bsky.social

Reposted by Johannes Quaas

tropos-de.bsky.social
tropos-de.bsky.social @tropos-de.bsky.social · Nov 10
Nicht verpassen! Heute 19:25 im #ZDF & online:
#Expedition #Amazonas mit #ATTO & der #Leipzig-er #Wolken-Forscherin Mira Pöhlker (#TROPOS) > www.zdf.de/video/dokus/...

#COP30 #Brazil @zdfde.bsky.social #Klimawandel #ATTOproject @mpic.de #MPI_BGC @leibniz-gemeinschaft.de @unileipzig.bsky.social

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Nov 10
A joint job offer is open for Junior Professorship Financial Economics
@unileipzig.bsky.social together with the excellent @iwh-halle.bsky.social
Really interesting focus on sustainability, links to biodiversity and climate:
www.uni-leipzig.de/en/universit...
Junior Professorship in VWL, esp. Financial Economics (W1)
www.uni-leipzig.de

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Oct 27
I think it should be important to consider clouds. There are more clouds over forests, and that compensates on average some 40% of the albedo effect, Luo et al. Nat Comms 2024 (www.nature.com/articles/s41...)
Decreased cloud cover partially offsets the cooling effects of surface albedo change due to deforestation - Nature Communications
This study shows that deforestation locally reduces global low-level and tropical high-level clouds, with the resulting warming partially counteracting the cooling of increased surface albedo.
www.nature.com

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Oct 23
Hey Gunnar, how many more high impact papers this year? Amazing!

Reposted by Christian Odendahl, Johannes Quaas

janrosenow.bsky.social
Jan Rosenow @janrosenow.bsky.social · Oct 20
It was a call I couldn't ignore.

I was formally invited by the Danish EU Presidency to Luxembourg to speak about industrial electrification and energy efficiency directly to the energy ministers from every single one of the 27 EU member states on the 20th of October.
www.youtube.com/watch?v=FO30...
Speaking at EU Energy Council
YouTube video by Jan Rosenow
www.youtube.com

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Sep 29
Wow, this looks beautiful

Reposted by Johannes Quaas, Tuomas Mattila

hausfath.bsky.social
Zeke Hausfather @hausfath.bsky.social · Sep 28
Last week the German Meteorological Society warned that "the 3-degree limit could be exceeded as early as 2050".

While not possible to fully rule out, the assessed warming scenarios we published in the IPCC AR6 report find this to be extremely unlikely.

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Sep 27
That's really great, congratulations! And I'm happy my colleague Made Maahn @meteoleipzig.bsky.social helps make it happen!

Reposted by Johannes Quaas

robinjhogan.bsky.social
Robin Hogan @robinjhogan.bsky.social · Sep 26
It's official: WIVERN will be ESA's 11th Earth Explorer satellite, measuring winds deep inside hurricanes, fronts and other weather systems!
www.esa.int/Applications...
ESA selects WIVERN as 11th Earth Explorer mission
After meticulous preparation and rigorous evaluation, ESA’s Member States have selected WIVERN to become the 11th Earth Explorer mission to be implemented through the agency’s prestigious FutureEO pro...
www.esa.int

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Sep 26
The national project "WarmWorld" works on the new-generation global climate simulations at resolutions as high as 1 km. At @kit.edu a group of us met to discuss how to represent the cloud processes in clouds in such computationally-demanding models, to account for pollution effects on climate.

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Sep 24
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

Reposted by Michael Wagner, Johannes Quaas, Jamie Hannaford , and 8 more

hausfath.bsky.social
Zeke Hausfather @hausfath.bsky.social · Sep 23
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!

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Sep 12
amazing progress in just one year on understanding air pollution in cities, multifunctionality of ecosystems, aerosols as climate drivers, or the role of heat waves. Excellent keynote by Agnes Tomini from the Aix-Marseille school of economics
eco-n.org @unileipzig.bsky.social, funding by @dfg.de

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Sep 12
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.

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Sep 4
By the way, Timo presented their nice paper demonstrating that climate attribution has the potential to change people's attitudes, and that people are even willing to pay for it: www.journals.uchicago.edu/doi/10.1086/...

Reposted by Friederike Otto, Mariana Madruga de Brito

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Sep 4
Hosted by @meteoleipzig.bsky.social @unileipzig.bsky.social @tropos-de.bsky.social , ECO-N research training group funded by @dfg.de
Great lectures by @sebastian-sippel.bsky.social @frediotto.bsky.social @mdebrito.bsky.social @zscheischlerjak.bsky.social and more!

Reposted by Friederike Otto

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Sep 4
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!