Johannes Quaas
@jquaas.bsky.social
Theoretical Meteorology, Leipzig University
Clouds and climate, biodiversity and climate, aerosols and clouds
Clouds and climate, biodiversity and climate, aerosols and clouds
Reminder: today is the deadline to apply for the 14 PhD positions in our Research Training Group "Economics of connected natural commons: Atmosphere and Biodiversity" www.uni-leipzig.de/en/economics... www.eco-n.org
Universität Leipzig: Apply for one of the 14 Open Doctoral Researcher Positions
In September 2026, the 2nd cohort of ECO-N doctoral researchers will start and we seek to fill 14 open positions. The application phase will be open until 30 January 2026.
www.uni-leipzig.de
January 30, 2026 at 10:10 AM
Reminder: today is the deadline to apply for the 14 PhD positions in our Research Training Group "Economics of connected natural commons: Atmosphere and Biodiversity" www.uni-leipzig.de/en/economics... www.eco-n.org
Please let us also know in case European colleagues can do meaningful things to support!
January 24, 2026 at 6:53 AM
Please let us also know in case European colleagues can do meaningful things to support!
Reposted by Johannes Quaas
Very embarrising day for EU. It is incomprehensible how parliamentarians, precisely on the days when Trump is reaching out to Greenland, fail to understand what is at stake.
When it comes to the economy, are the Europeans sometimes their own worst enemy? The newly signed trade pact between the EU and South American is derailed. www.nytimes.com/2026/01/21/u...
As Europe Tries to Diversify Trade, a Major Deal With South America Stumbles
www.nytimes.com
January 22, 2026 at 2:49 AM
Very embarrising day for EU. It is incomprehensible how parliamentarians, precisely on the days when Trump is reaching out to Greenland, fail to understand what is at stake.
The Director of the German Climate Computing Centre (www.dkrz.de) is a joint appointment with University of Hamburg and leads the central facility for climate computing, being enlarged to also be a central climate data facility. A crucial thing for German climate science. Closing date: 17 Feb 2026
DKRZ - Partner der Klimaforschung
www.dkrz.de
January 20, 2026 at 7:09 AM
The Director of the German Climate Computing Centre (www.dkrz.de) is a joint appointment with University of Hamburg and leads the central facility for climate computing, being enlarged to also be a central climate data facility. A crucial thing for German climate science. Closing date: 17 Feb 2026
The director of @tropos-de.bsky.social is advertised as joint appointment as a full professor for Atmospheric Physics @meteoleipzig.bsky.social @unileipzig.bsky.social TROPOS is one of the large research centres in atmospheric sciences in Germany. Closing date: 31 March 2026
January 20, 2026 at 7:08 AM
The director of @tropos-de.bsky.social is advertised as joint appointment as a full professor for Atmospheric Physics @meteoleipzig.bsky.social @unileipzig.bsky.social TROPOS is one of the large research centres in atmospheric sciences in Germany. Closing date: 31 March 2026
Currently 2 important positions in German climate/atmospheric science are advertised: Director of the Leibniz-Institute for Tropospheric Research (www.uni-leipzig.de/en/universit...) and Director of the German Climate Computing Centre (DKRZ, www.uni-hamburg.de/en/stellenan...)
Home - Leibniz-Institut für Troposphärenforschung e.V. (TROPOS)
Das Leibniz-Institut für Troposphärenforschung besitzt ein klares und weltweit einzigartiges Forschungsprofil, in dessen Mittelpunkt Aerosole, also kleinste luftgetragene Partikel, und Wolken stehen.
www.tropos.de
January 20, 2026 at 7:07 AM
Currently 2 important positions in German climate/atmospheric science are advertised: Director of the Leibniz-Institute for Tropospheric Research (www.uni-leipzig.de/en/universit...) and Director of the German Climate Computing Centre (DKRZ, www.uni-hamburg.de/en/stellenan...)
Reposted by Johannes Quaas
Loooooong applause - and then a standing ovation - at the European Parliament this evening, as President president @president.europarl.europa.eu says Europe is resolute in defending the status and sovereignty of Denmark and Greenland
January 19, 2026 at 5:08 PM
Loooooong applause - and then a standing ovation - at the European Parliament this evening, as President president @president.europarl.europa.eu says Europe is resolute in defending the status and sovereignty of Denmark and Greenland
Reposted by Johannes Quaas
Recommended read: A commentary co-authored by climate scientist Prof @clequere.bsky.social in Nature argued that several climate trends have locked in “irreversible progress in climate action”.
Irreversibility in climate action - Nature Climate Change
Although climate action is undermined by political interests and institutional inertia, multiple safeguards are in place to prevent backsliding on progress so far, and positive feedbacks reinforce…
buff.ly
January 17, 2026 at 2:49 PM
Recommended read: A commentary co-authored by climate scientist Prof @clequere.bsky.social in Nature argued that several climate trends have locked in “irreversible progress in climate action”.
Reposted by Johannes Quaas
IWH Research Seminar in #Economics with Gauthier Vermandel (@vermandel.bsky.social, Ecole Polytechnique)
📢 The New Keynesian #Climate Model
📅 Tuesday, January 13, 2:15 pm CET
▶️ Join us via Zoom! Please register here to get your link: www.iwh-halle.de/en/about-the...
#climatechange #climatepolicy
📢 The New Keynesian #Climate Model
📅 Tuesday, January 13, 2:15 pm CET
▶️ Join us via Zoom! Please register here to get your link: www.iwh-halle.de/en/about-the...
#climatechange #climatepolicy
January 8, 2026 at 3:26 PM
IWH Research Seminar in #Economics with Gauthier Vermandel (@vermandel.bsky.social, Ecole Polytechnique)
📢 The New Keynesian #Climate Model
📅 Tuesday, January 13, 2:15 pm CET
▶️ Join us via Zoom! Please register here to get your link: www.iwh-halle.de/en/about-the...
#climatechange #climatepolicy
📢 The New Keynesian #Climate Model
📅 Tuesday, January 13, 2:15 pm CET
▶️ Join us via Zoom! Please register here to get your link: www.iwh-halle.de/en/about-the...
#climatechange #climatepolicy
Reposted by Johannes Quaas
Humans have emitted 2750 gigatons of CO2 since the industrial revolution from burning fossil fuels and land use change. To put this in perspective, this is more than the (dry) mass of all living things on earth and everything humans have ever built combined:
January 2, 2026 at 6:49 PM
Humans have emitted 2750 gigatons of CO2 since the industrial revolution from burning fossil fuels and land use change. To put this in perspective, this is more than the (dry) mass of all living things on earth and everything humans have ever built combined:
Reposted by Johannes Quaas
📢 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...
📍 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
December 18, 2025 at 9:45 PM
📢 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...
📍 Joint post: Universities of Oxford & Edinburgh
⏰ Apply by 15 Jan 2026 (noon GMT)
Details & apply 👉 my.corehr.com/pls/uoxrecru...
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.
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...
December 18, 2025 at 8:23 AM
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.
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.
We seek to fill 14 funded doctoral researcher positions for the period September 2026 to August 2029, with envisaged extension to 2030.
December 11, 2025 at 3:30 PM
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.
We seek to fill 14 funded doctoral researcher positions for the period September 2026 to August 2029, with envisaged extension to 2030.
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.
December 11, 2025 at 3:30 PM
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.
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
uni-leipzig.b-ite.careers/jobposting/9...
@unileipzig.bsky.social
December 11, 2025 at 3:29 PM
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
uni-leipzig.b-ite.careers/jobposting/9...
@unileipzig.bsky.social
Reposted by Johannes Quaas
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
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
November 25, 2025 at 2:19 PM
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
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
Fascinating image!
November 15, 2025 at 5:21 AM
Fascinating image!
Great study by our iDiv colleagues: biodiversity in forests helps to mitigate impacts of climate change
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...
www.idiv.de/diverse-fore...
Diverse forests are more resistant to climate change
www.idiv.de
November 14, 2025 at 6:06 AM
Great study by our iDiv colleagues: biodiversity in forests helps to mitigate impacts of climate change
Reposted by Johannes Quaas
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.
This ad keeps making me chuckle.
Enjoy if you have not seen it or rewatch as it is just gold.
November 11, 2025 at 8:04 AM
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.
This ad keeps making me chuckle.
Enjoy if you have not seen it or rewatch as it is just gold.
Dokumentation über Klima und Amazonas mit der super Kollegin Mira Pöhlker @tropos-de.bsky.social @meteoleipzig.bsky.social
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
#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
November 10, 2025 at 9:19 PM
Dokumentation über Klima und Amazonas mit der super Kollegin Mira Pöhlker @tropos-de.bsky.social @meteoleipzig.bsky.social
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...
@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
November 10, 2025 at 10:17 AM
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...
@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...
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
October 27, 2025 at 7:35 AM
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...)
Hey Gunnar, how many more high impact papers this year? Amazing!
October 23, 2025 at 4:33 PM
Hey Gunnar, how many more high impact papers this year? Amazing!