Climate models
Europe’s first continent-wide 2.2 km rain projections
Open access · cc by · source: Europe PMC
A 2.2 km convection-permitting model projects wetter northern winters and drier summers, with summer hourly extremes unlike coarser GCMs.
Study at a glance
- Design
- Computational / modelling — 2.2 km Unified Model CPM nested in HadGEM3 for Europe present/future RCP8.5 rain
- N
- Single Europe-wide CPM experiment set (hindcast 1999–2008 + future); not a sample N
- Population
- European precipitation in convection-permitting climate simulations
- Outcome
- Mean and extreme precipitation changes (wetter northern winters; drier summers)
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
This is the first CPM used for Europe-wide future projections. Northern winters get wetter with more extremes; summers dry over Northern and Central Europe. Continental summer hourly extremes are more muted than in UK CPM work and not significant versus year-to-year noise. Land models are ~30% wetter than E-OBS.
Methodology
Authors nested Met Office Unified Model 2.2 km CPM runs in ERA-Interim (1999–2008 hindcast) and 25 km HadGEM3 present/future RCP8.5 simulations, then compared mean rain, heavy-event frequency, and seasonality with E-OBS.
Limitations
Only 10-year time slices and a single GCM/RCP8.5 path; no intermediate nest; E-OBS under-samples hourly extremes; Central European summer-extreme decline is not significant.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
This library holds 4 empirical papers on climate models with measured outcomes rather than reviews.
Evidence for the claim as stated.
A 2.2 km convection-permitting model projects wetter northern winters and drier summers, with summer hourly extremes unlike coarser GCMs.
Evidence for the claim as stated.
High-resolution rain over Europe is not global climate sensitivity.
Evidence for the claim as stated.
Reanalysis also supplies the hindcast boundary for high-resolution experiments. A 2.2 km convection-permitting model nested in ERA-Interim (1999–2008) then in HadGEM3 produced Europe-wide rain projections; Isca SST experiments for Brazil’s 2014 drought used ERA-Interim circulation as the diagnostic target. Those are model experiments that start from a reanalysis, not additional observations.
Evidence for the claim as stated.
Idealised or nested experiments use small ensembles for a different purpose: tracing a drought to a basin of SST, or asking whether a regional model or its GCM driver sets storm skill. Those spreads are not interchangeable with a 100-member 21st-century probability ratio.
Evidence for the claim as stated.
Europe’s first continent-wide convection-permitting projections nest 2.2 km Unified Model runs in ERA-Interim (1999–2008) and in 25 km HadGEM3 present/future RCP8.5. Northern winters get wetter with more extremes; summers dry over Northern and Central Europe. Continental summer hourly extremes are more muted than in UK CPM work and not significant versus year-to-year noise. Land models are ~30% wetter than E-OBS. Only 10-year slices and a single GCM/RCP path.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
High-resolution rain over Europe is not global climate sensitivity.
Idealised or nested experiments use small ensembles for a different purpose: tracing a drought to a basin of SST, or asking whether a regional model or its GCM driver sets storm skill. Those spreads are not interchangeable with a 100-member 21st-century probability ratio.
Related papers in this topic
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