Thomas Rackow 🧊
@trackow.bsky.social
Scientist @ecmwf.int : climate & ocean variability, kilometre-scale modelling, and its visualisation. #art and music enthusiast. #scicomm
Big thanks to @climateofgavin.bsky.social and the other authors for including me in this work. The data is open and available here:
📂 zenodo.org/records/1738... (7/7)
📂 zenodo.org/records/1738... (7/7)
Freshwater sources from Antarctica and Greenland
Freshwater sources from Greenland and Antarctica. For details see https://github.com/NASA-GISS/freshwater-forcing-workshop and https://doi.org/10.5194/egusphere-2025-1940 v7 update: See changelog at h...
zenodo.org
November 8, 2025 at 3:52 PM
Big thanks to @climateofgavin.bsky.social and the other authors for including me in this work. The data is open and available here:
📂 zenodo.org/records/1738... (7/7)
📂 zenodo.org/records/1738... (7/7)
The datasets are designed to be flexible. We make recommendations for how climatological & anomalous fluxes can be implemented in models that may have different approaches to interactions with ice sheets.
We hope this helps the community to move toward more physically consistent simulations. (6/7)
We hope this helps the community to move toward more physically consistent simulations. (6/7)
November 8, 2025 at 3:52 PM
The datasets are designed to be flexible. We make recommendations for how climatological & anomalous fluxes can be implemented in models that may have different approaches to interactions with ice sheets.
We hope this helps the community to move toward more physically consistent simulations. (6/7)
We hope this helps the community to move toward more physically consistent simulations. (6/7)
By providing spatially and temporally resolved meltwater fluxes, our dataset could enable a large set of models to explore how AMOC might respond to realistic freshwater forcing, not just idealised pulses. This is a key step toward understanding future climate dynamics under continued ice loss (5/n)
November 8, 2025 at 3:52 PM
By providing spatially and temporally resolved meltwater fluxes, our dataset could enable a large set of models to explore how AMOC might respond to realistic freshwater forcing, not just idealised pulses. This is a key step toward understanding future climate dynamics under continued ice loss (5/n)
Similar to volcanic forcing, we provide year-to-year timeseries of freshwater anomalies, enabling models to reflect observed historical variability.
This means better representation of events like Greenland’s 2012 melt spike or Antarctic ice loss & its evolving freshwater impact on the ocean (4/7)
This means better representation of events like Greenland’s 2012 melt spike or Antarctic ice loss & its evolving freshwater impact on the ocean (4/7)
November 8, 2025 at 3:52 PM
Similar to volcanic forcing, we provide year-to-year timeseries of freshwater anomalies, enabling models to reflect observed historical variability.
This means better representation of events like Greenland’s 2012 melt spike or Antarctic ice loss & its evolving freshwater impact on the ocean (4/7)
This means better representation of events like Greenland’s 2012 melt spike or Antarctic ice loss & its evolving freshwater impact on the ocean (4/7)
A personal highlight: we include iceberg melt patterns, a topic I’ve worked on for years and care deeply about.
Icebergs don’t just melt, they drift over vast distances, cool their surroundings, and shape regional ocean properties.
Capturing this spatial and vertical complexity matters. (3/7)
Icebergs don’t just melt, they drift over vast distances, cool their surroundings, and shape regional ocean properties.
Capturing this spatial and vertical complexity matters. (3/7)
November 8, 2025 at 3:52 PM
A personal highlight: we include iceberg melt patterns, a topic I’ve worked on for years and care deeply about.
Icebergs don’t just melt, they drift over vast distances, cool their surroundings, and shape regional ocean properties.
Capturing this spatial and vertical complexity matters. (3/7)
Icebergs don’t just melt, they drift over vast distances, cool their surroundings, and shape regional ocean properties.
Capturing this spatial and vertical complexity matters. (3/7)
We provide datasets of absolute & anomalous freshwater fluxes from Greenland/Antarctica, critical inputs for climate modelling, CMIP7 & beyond.
These fluxes include runoff, sub-shelf melt, and calving, each with distinct ocean impacts. Most models haven’t accounted for them properly until now (2/7)
These fluxes include runoff, sub-shelf melt, and calving, each with distinct ocean impacts. Most models haven’t accounted for them properly until now (2/7)
November 8, 2025 at 3:52 PM
We provide datasets of absolute & anomalous freshwater fluxes from Greenland/Antarctica, critical inputs for climate modelling, CMIP7 & beyond.
These fluxes include runoff, sub-shelf melt, and calving, each with distinct ocean impacts. Most models haven’t accounted for them properly until now (2/7)
These fluxes include runoff, sub-shelf melt, and calving, each with distinct ocean impacts. Most models haven’t accounted for them properly until now (2/7)
Reposted by Thomas Rackow 🧊
Finally, some excellent resources on the 2023 SST anomalies:
@polarocean.bsky.social
bsky.app/profile/pola...
@trackow.bsky.social
bsky.app/profile/trac...
bsky.app/profile/mice...
@tguinaldo.bsky.social
bsky.app/profile/tgui...
@profmattengland.bsky.social
bsky.app/profile/prof...
@polarocean.bsky.social
bsky.app/profile/pola...
@trackow.bsky.social
bsky.app/profile/trac...
bsky.app/profile/mice...
@tguinaldo.bsky.social
bsky.app/profile/tgui...
@profmattengland.bsky.social
bsky.app/profile/prof...
Why have the sea surface temperature suddenly risen in 2023/24? 🌊
Is it true that climate models cannot simulate such SST jumps? What is common to such jumps? How will SSTs evolve over the next months and years? Are we in uncharted territory? More from our recent study in Nature is here👇
Is it true that climate models cannot simulate such SST jumps? What is common to such jumps? How will SSTs evolve over the next months and years? Are we in uncharted territory? More from our recent study in Nature is here👇
Record sea surface temperature jump in 2023–2024 unlikely but not unexpected - Nature
Observations and climate models suggest that the global sea surface temperature jump in 2023–2024 was not unexpected and would have been nearly impossible without anthropogenic warming.
www.nature.com
September 2, 2025 at 11:59 AM
Finally, some excellent resources on the 2023 SST anomalies:
@polarocean.bsky.social
bsky.app/profile/pola...
@trackow.bsky.social
bsky.app/profile/trac...
bsky.app/profile/mice...
@tguinaldo.bsky.social
bsky.app/profile/tgui...
@profmattengland.bsky.social
bsky.app/profile/prof...
@polarocean.bsky.social
bsky.app/profile/pola...
@trackow.bsky.social
bsky.app/profile/trac...
bsky.app/profile/mice...
@tguinaldo.bsky.social
bsky.app/profile/tgui...
@profmattengland.bsky.social
bsky.app/profile/prof...
Reposted by Thomas Rackow 🧊
Enfin, la température de l'eau à la surface de la mer Méditerrannée entre la France rt l'Afrique du Nord a été historiquement élevée (tous mois confondus) en juin : jusqu'à 27 °C, soit +3,7 °C par rapport à la "normale".
3/3
3/3
July 9, 2025 at 7:24 AM
Enfin, la température de l'eau à la surface de la mer Méditerrannée entre la France rt l'Afrique du Nord a été historiquement élevée (tous mois confondus) en juin : jusqu'à 27 °C, soit +3,7 °C par rapport à la "normale".
3/3
3/3
Reposted by Thomas Rackow 🧊
If I can add something. Here we demonstrate that NATL warming was due to natural variability. The event was excepted and in line with climate projections (return period around 10 years). The processes are well known and we can explain it.
www.nature.com/articles/s43...
www.nature.com/articles/s43...
Internal variability effect doped by climate change drove the 2023 marine heat extreme in the North Atlantic - Communications Earth & Environment
The 2023 North Atlantic marine heatwave was driven by an extreme phase of internal atmospheric variability but would have been impossible without the doping effect of anthropogenic warming, according ...
www.nature.com
May 13, 2025 at 6:54 PM
If I can add something. Here we demonstrate that NATL warming was due to natural variability. The event was excepted and in line with climate projections (return period around 10 years). The processes are well known and we can explain it.
www.nature.com/articles/s43...
www.nature.com/articles/s43...