Johannes Quaas
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jquaas.bsky.social
Johannes Quaas
@jquaas.bsky.social
1.5K followers 260 following 71 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

meteoleipzig.bsky.social
Leipzig Institute for Meteorology @meteoleipzig.bsky.social · 9h
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 · 10d
Fascinating image!

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · 11d
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 · 12d
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 · 12d
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 · 14d
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 · 15d
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 · 15d
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 · 15d
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 · 29d
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!

Reposted by Vincent Noël

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Sep 4
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
andrewdessler.com Andrew Dessler @andrewdessler.com · Sep 4
nice article from Nadir Jeevanjee (is he on bluesky?) about predictions climate models got right. successful predictions are the gold standard of science.

5 forecasts early climate models got right – the evidence is all around you
theconversation.com/5-forecasts-...
5 forecasts early climate models got right – the evidence is all around you
From rising global temperatures to the fast-warming Arctic, early climate models predicted the changes half a century ago.
theconversation.com

Reposted by Johannes Quaas, Vincent Noël

andrewdessler.com
Andrew Dessler @andrewdessler.com · Sep 4
nice article from Nadir Jeevanjee (is he on bluesky?) about predictions climate models got right. successful predictions are the gold standard of science.

5 forecasts early climate models got right – the evidence is all around you
theconversation.com/5-forecasts-...
5 forecasts early climate models got right – the evidence is all around you
From rising global temperatures to the fast-warming Arctic, early climate models predicted the changes half a century ago.
theconversation.com

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Aug 31
What a hubris. Leading back to the time before division of labor. The point is of course indeed, we all have to stop believing those in power

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Aug 28
Fantastic collaboration within EU-funded Marie Curie Innovative Training Network "imiracli" especially with @isp-uv-es.bsky.social !

Reposted by Peter Thorne

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Aug 28
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...

jquaas.bsky.social
Johannes Quaas @jquaas.bsky.social · Aug 18
I'm glad to contribute again!
ipcc.bsky.social IPCC @ipcc.bsky.social · Aug 18
The #IPCC has announced the authors selected for its Seventh Assessment Report.

664 experts from 111 countries have been invited to participate as Coordinating Lead Authors, Lead Authors, & Review Editors.

🌍 51% from developing countries
🚺 46% women

🔗 bit.ly/AR7AuthorsPR

Reposted by Valerie M. Delmotte, Richard S.J. Tol, Glen P. Peters , and 17 more

ipcc.bsky.social
IPCC @ipcc.bsky.social · Aug 18
The #IPCC has announced the authors selected for its Seventh Assessment Report.

664 experts from 111 countries have been invited to participate as Coordinating Lead Authors, Lead Authors, & Review Editors.

🌍 51% from developing countries
🚺 46% women

🔗 bit.ly/AR7AuthorsPR