Lightnews — Scholar-powered news

Lukas Brunner @lukasbrunner.bsky.social · Sep 2

Comparing global km-scale climate models to the resolution of coarser CMIP6 models.
The video shows precipitation flux and accumulated precipitation for 2025, ending with a quantification of the difference in resolutions.
Animation: Michael Böttinger (DKRZ)
Method & paper: bsky.app/profile/luka...

1 3

Lukas Brunner @lukasbrunner.bsky.social · Aug 21

See also the amazing visualization made by DKRZ based on our work 👇👇
bsky.app/profile/luka...

Lukas Brunner @lukasbrunner.bsky.social · Aug 18

Amazing visualization of our recent sub-grid variability work by Michael Böttinger (DKRZ) 🤩.
It shows the local detail in global precipitation resolved by km-scale models. From 0:50 in direct comparison to CMIP6-type 100km. From 2:07 the sub-grid variability is shown. 🤓🧪
youtu.be/fzA92tSF4ZM?...

The spatial representation of precipitation - a comparison between km-scale and CMIP-type model data

YouTube video by Deutsches Klimarechenzentrum

youtu.be

1 2

Lukas Brunner @lukasbrunner.bsky.social · Aug 19

Here's also my thread on the main findings: /profile/lukasbrunner.bsky.social/post/3lrsdhwkev22y

IOPP Environment and Energy @iopp-environment.bsky.social · Aug 19

🌍New #ERL study shows how coarser 100km climate model grids miss key extremes – especially in mountains and tropics. 🏔️🌧️Using 10km resolution, researchers outline improved insights into temperature & precipitation extremes📊🔥
🔗 iopscience.iop.org/article/10.1...

4

Lukas Brunner @lukasbrunner.bsky.social · Aug 18

Here is the thread to the original publication:
bsky.app/profile/luka...

Lukas Brunner @lukasbrunner.bsky.social · Jun 17

New paper in ERL! We study the importance of resolution for the representation of climate extremes.

We use a new generation of km-scale models to show that many important details about temperature and precipitation extremes are hidden at CMIP6-like resolutions.

doi.org/10.1088/1748...

1

Lukas Brunner @lukasbrunner.bsky.social · Aug 18

Amazing visualization of our recent sub-grid variability work by Michael Böttinger (DKRZ) 🤩.
It shows the local detail in global precipitation resolved by km-scale models. From 0:50 in direct comparison to CMIP6-type 100km. From 2:07 the sub-grid variability is shown. 🤓🧪
youtu.be/fzA92tSF4ZM?...

The spatial representation of precipitation - a comparison between km-scale and CMIP-type model data

YouTube video by Deutsches Klimarechenzentrum

youtu.be

1 2 8

Lukas Brunner @lukasbrunner.bsky.social · Aug 3

Local downpour near Oberstdorf, Germany ⛰️

2

Lukas Brunner @lukasbrunner.bsky.social · Jul 28

Mehr zum Format und zukünftigen Vorlesungen: www.uni-hamburg.de/wissen-fuer-...

Vorlesung für alle

Raus aus der Uni, rein in die Stadt: Bei der „Vorlesung für alle“ halten Forschende Vorträge an ungewöhnlichen Orten in der Stadt.

www.uni-hamburg.de

1 1

Lukas Brunner @lukasbrunner.bsky.social · Jul 28

Vor einigen Wochen durfte ich im Rahmen des Formats Vorlesung für Alle der @uni-hamburg.de einen Vortrag zu Temperaturextremen geben. Die Aufzeichnung ist jetzt auf YouTube 👇 Danke für die Einladung und das Interesse!
youtu.be/0KGi4Y6J2Ls?...

Vorlesung für alle - Wie ändern sich Wetterextreme mit dem Klimawandel?

YouTube video by Universität Hamburg

youtu.be

2 3 8

Reposted by Lukas Brunner

Lukas Brunner @lukasbrunner.bsky.social · Jun 17

New paper in ERL! We study the importance of resolution for the representation of climate extremes.

We use a new generation of km-scale models to show that many important details about temperature and precipitation extremes are hidden at CMIP6-like resolutions.

doi.org/10.1088/1748...

3 22 58

Reposted by Lukas Brunner

Katharine Hayhoe @katharinehayhoe.com · Jun 21

Today is #ShowYourStripes Day!

Created by @edhawkins.org, the warming stripes show temperature each year: blue for cool, white for avg, red for hot.

Athletes are wearing them, knitters are knitting them, and cities are putting them on trams.

Find + share your "stripes" here: showyourstripes.info

Text reading "start a climate conversation" superimposed over the global warming stripes.

8 63 200

Lukas Brunner @lukasbrunner.bsky.social · Jun 21

Annually the impact of climate change is pretty clear even locally. And even on a daily basis the signal starts to emerge!

For regular updates on daily Hamburg temperatures in a long term context, check out my bot @weather-climate.bsky.social (still 🚧)

2025 so far: bsky.app/profile/weat...

Lukas Brunner @lukasbrunner.bsky.social · Jun 21

Temperature anomaly relative to 1951-2010 in Hamburg, Germany

#ShowYourStripes day #SystemChangeNotClimateChange

4

Lukas Brunner @lukasbrunner.bsky.social · Jun 21

Scary but fitting read for the occasion 🫣

Book cover: Welt ohne Morgen by Tom Roth

Lukas Brunner @lukasbrunner.bsky.social · Jun 21

Temperature anomaly relative to 1951-2010 in Hamburg, Germany

#ShowYourStripes day #SystemChangeNotClimateChange

1 1 8

Reposted by Lukas Brunner

Sarah Perkins-Kirkpatrick @sarahinscience.bsky.social · Jun 20

The first 3 eps of TOTALLY COOKED have landed!
Check it out for weather & climate in a factual, relatable & often humorous way.
Available below, & where you get your podcasts.
Like, follow & share.
Let's tackle the climate crisis together.
#totallycooked
www.21centuryweather.org.au/engage/total...

Totally Cooked: The Weather & Climate Podcast

The climate is changing. So is the conversation. Totally Cooked is a podcast about weather, climate change, and what it all means for life on Earth.

www.21centuryweather.org.au

2 8 22

Lukas Brunner @lukasbrunner.bsky.social · Jun 19

The repository is hierarchical. Click on the rightmost tab, there you can select one of the two models, and then again one of the two resolutions. At the lowest level, there is a green 'Download' button.

Here's a direct link to the high-resolution IOCN results: www.wdc-climate.de/ui/entry?acr...

Metadata for 'Annual ETCCDI Extreme Indices For ICON-Sapphire (nextGEMS Cycle 4) - high resolution (HEALPix zoom 9)'

www.wdc-climate.de

1 1

Lukas Brunner @lukasbrunner.bsky.social · Jun 18

@cenunihh.bsky.social climate visualization lab has created this nice animation of the resolution effect on climate extremes! 🤩 Comparison of CMIP6-like 100km and the new 10km for the example of TXx (hottest day in the year).

Details in the paper: doi.org/10.1088/1748...

youtu.be/R5laSSVHUAk?...

Next generation global models reveal new spatial details of temperature extremes

YouTube video by CEN Climate Visualization Laboratory

youtu.be

1 11

Reposted by Lukas Brunner

CEN University of Hamburg @cenunihh.bsky.social · Jun 18

Resolution matters: Extreme temperatures in e.g. Indian cities can be underestimated by up to 10°C, a paper by @lukasbrunner.bsky.social‬ shows. High-res climate models (<10 km) reveal that important details about extremes are hidden at lower resolutions. iopscience.iop.org/article/10.1...

Portrait of climate researcher Lukas Brunner, including his quote: “Resolution is important for climate extremes! Peak temperatures can be up to 10°C higher in next-generation climate models just due to their finer resolution.
These findings are particularly important for robust risk assessments.”
Photo: L. Brunner

2 5

Lukas Brunner @lukasbrunner.bsky.social · Jun 18

We are working on related topics right now but I can't make any specific promises at this point.

Having said that: we have published all the data that go into our study as netCDF (thats annual extreme indices from 2021-2049)👇
bsky.app/profile/luka...

Lukas Brunner @lukasbrunner.bsky.social · Jun 17

We focus on a subset of the 27 ETCCDI climate extreme indices in the paper. But we have published the full set of ETCCDI indices with 10km resolution globally at the World Data Center for Climate here:

doi.org/10.26050/WDC...

Metadata for 'Annual ETCCDI Extreme Indices For ICON-Sapphire And IFS-FESOM (nextGEMS Cycle 4)'

www.wdc-climate.de

1

Lukas Brunner @lukasbrunner.bsky.social · Jun 17

@erichfischer.bsky.social @omartius.bsky.social @janasillmann.bsky.social @uni-hamburg.de @cenunihh.bsky.social @ioppublishing.bsky.social

2

Lukas Brunner @lukasbrunner.bsky.social · Jun 17

An extensive database of plots for all ETCCDI climate extreme indices is also available under a CC BY license on Zenodo: doi.org/10.5281/zeno...

1 3

Lukas Brunner @lukasbrunner.bsky.social · Jun 17

The code we used to produce our figures is freely available under a permissive license. If you want to work with it and have any questions, feel free to reach out to me. There are also open master’s thesis projects on the topic!

github.com/lukasbrunner...

GitHub - lukasbrunner/Brunner_etal_2025_ERL

Contribute to lukasbrunner/Brunner_etal_2025_ERL development by creating an account on GitHub.

github.com

1 4

Lukas Brunner @lukasbrunner.bsky.social · Jun 17

We focus on a subset of the 27 ETCCDI climate extreme indices in the paper. But we have published the full set of ETCCDI indices with 10km resolution globally at the World Data Center for Climate here:

doi.org/10.26050/WDC...

Metadata for 'Annual ETCCDI Extreme Indices For ICON-Sapphire And IFS-FESOM (nextGEMS Cycle 4)'

www.wdc-climate.de

1 1

Lukas Brunner @lukasbrunner.bsky.social · Jun 17

We calculate extreme indices from two ~10km models (ICON & IFS). From them we quantify what information is lost at CMIP6-like resolutions of ~100km.

To do so we introduce the concepts of sub-grid variability and sub-grid anomaly. Details in the paper:

iopscience.iop.org/article/10.1...

A global perspective on the spatial representation of climate extremes from km-scale models - IOPscience

A global perspective on the spatial representation of climate extremes from km-scale models, Brunner, Lukas, Poschlod, Benjamin, Dutra, Emanuel, Fischer, Erich M, Martius, Olivia, Sillmann, Jana

iopscience.iop.org

1 1 2

Lukas Brunner @lukasbrunner.bsky.social · Jun 17

New paper in ERL! We study the importance of resolution for the representation of climate extremes.

We use a new generation of km-scale models to show that many important details about temperature and precipitation extremes are hidden at CMIP6-like resolutions.

doi.org/10.1088/1748...

3 22 58

Reposted by Lukas Brunner

Laura Suarez-Gutierrez @drlaurasuarez.bsky.social · Apr 27

#EGU25 is about to start!

If you're there, check out our session on High-impact Climate Extremes on Tuesday, room 🟨 F1

🧪: meetingorganizer.copernicus.org/EGU25/sessio...

With many exciting talks, including the CL Division Outstanding ECS Award Lecture by
@kornhuber.bsky.social

1 5 32