Clouds amplified the 2022 Antarctic heatwave
Water-vapor and supercooled-cloud feedbacks added several degrees to the March 2022 East Antarctic heatwave compared with a preindustrial storyline.
Source
Impact attribution of the March 2022 Antarctic heatwave reveals amplification by cloud feedbacks and increased future meltwater
Study at a glance
- Design
- Computational / modelling — 27 km CRYOWRF factual vs pseudo-global-warming storylines of the March 2022 heatwave
- N
- Storyline simulations driven by ERA5 and six CMIP6 deltas; not an observational sample N
- Population
- East Antarctic atmosphere/firn during 15–20 March 2022 under present and counterfactual climates
- Outcome
- Cloud/longwave amplification of heatwave temperature and future meltwater implications
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
The authors ran 27 km CRYOWRF storylines of 15–20 March 2022: a factual ERA5-driven case and counterfactuals for preindustrial, SSP2-4.5, and SSP5-8.5 climates using pseudo-global-warming deltas from six CMIP6 models, then diagnosed temperature, clouds, radiation, and firn hydrology.
What they found
Near Concordia the heatwave was amplified by 5.4 ± 0.2 °C versus preindustrial (15–25% of the anomaly). Current-climate peak temperature reached −12 °C (model −11.9 °C vs observed −11.6 °C). Incoming longwave radiation increased 16.0 ± 1.9 W m−2. Future coastal firn liquid water rises by factors of 2.4 (SSP2-4.5) and 5.6 (SSP5-8.5), up to 0.079 Gt of meltwater for this event under SSP5-8.5.
The limits
What it doesn't show
A single 27 km storyline of one event cannot sample all atmospheric-river trajectories. The model has a warm bias in the stable pre-event period and a too-high inversion. Cloud feedbacks remain a major CMIP6 uncertainty.
Key terms
- Storyline attribution
- Rerun a specific observed event under different climate backgrounds while keeping the synoptic sequence similar.
- Pseudo-global warming (PGW)
- Add climate-change ‘delta’ fields from GCMs to reanalysis initial and boundary conditions.
- Firn air content (FAC)
- Pore space in compacted snow; loss of FAC and ice-lens growth make the ice sheet less able to store meltwater.
Flashcards
Research intelligence for this paper
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Quiz yourself
The March 2022 Antarctic heatwave was associated with:
Common questions
Why did this model warm more than CESM1 storylines of the same event?
CRYOWRF’s non-hydrostatic 27 km grid and cloud microphysics captured supercooled liquid and longwave heating that coarse hydrostatic CESM missed (peak −20 °C there versus about −12 °C here).
Where does future amplification move?
Away from interior domes toward the coast, especially under SSP5-8.5.
Was the heatwave tied to ice-shelf change?
The March 2022 event has been linked to collapse of the Conger Ice Shelf, showing how extremes can affect ice-sheet stability.
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