What does this research mean for the field?

Inter-annual variability dominates the occurrence of year-round North Atlantic European weather regimes with few significant long-term trends, while extreme regime durations are strongly associated with seasonal weather extremes in Europe. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.SUPPORTS_CONSENSUS.

What question did this study set out to answer?

To establish and evaluate an updated, seamless year-round definition of seven North Atlantic European weather regimes and assess their life cycle characteristics and trends from 1950 to 2024.

September 5, 2026Weather and Climate DynamicsOpen Access

A life cycle definition of year-round weather regimes in the North Atlantic European region

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Authors

CGChristian M. Grams

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Overview

Climate reanalysis study reveals extreme weather regime life cycles drive seasonal extremes in Europe, highlighting predominantly stable long-term occurrence trends.

Key Points

To establish and evaluate an updated, seamless year-round definition of seven North Atlantic European weather regimes and assess their life cycle characteristics and trends from 1950 to 2024.
Updated a year-round weather regime framework using ERA5 atmospheric reanalysis data covering 1979–2019.
Evaluated life cycle duration, inter-annual variability, and intra-annual variability across seven defined circulation regimes.
Extended the regime identification across 1950–2024 to detect long-term historical frequency trends.
Extreme durations of weather regime life cycles directly coincide with extreme European seasons, including heat waves, cold spells, and recurrent storm series.
Inter-annual variability dominates weather regime occurrence, with nearly no statistically significant long-term trends observed over the 1950–2024 period.
Scandinavian Blocking displays a significant positive occurrence trend in summer and autumn linked to thermal expansion of the troposphere under warming, though the signal remains method-sensitive.

Cite This Study

Christian M. Grams (2026) studied this question.

synapsesocial.com/papers/6a9bd3726b95aff0620eaa4f https://doi.org/10.5194/wcd-7-1641-2026

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September 5, 2026Weather and Climate DynamicsOpen Access

A life cycle definition of year-round weather regimes in the North Atlantic European region

View Full Paper

Ask AI

Bookmark

Authors

CGChristian M. Grams

Discussion

Member takes

Overview

Climate reanalysis study reveals extreme weather regime life cycles drive seasonal extremes in Europe, highlighting predominantly stable long-term occurrence trends.

Key Points

To establish and evaluate an updated, seamless year-round definition of seven North Atlantic European weather regimes and assess their life cycle characteristics and trends from 1950 to 2024.
Updated a year-round weather regime framework using ERA5 atmospheric reanalysis data covering 1979–2019.
Evaluated life cycle duration, inter-annual variability, and intra-annual variability across seven defined circulation regimes.
Extended the regime identification across 1950–2024 to detect long-term historical frequency trends.
Extreme durations of weather regime life cycles directly coincide with extreme European seasons, including heat waves, cold spells, and recurrent storm series.
Inter-annual variability dominates weather regime occurrence, with nearly no statistically significant long-term trends observed over the 1950–2024 period.
Scandinavian Blocking displays a significant positive occurrence trend in summer and autumn linked to thermal expansion of the troposphere under warming, though the signal remains method-sensitive.

Cite This Study

Christian M. Grams (2026) studied this question.

synapsesocial.com/papers/6a9bd3726b95aff0620eaa4f https://doi.org/10.5194/wcd-7-1641-2026

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