How do large-scale atmospheric waves and tropical forcing (especially ENSO) transmit anomalies across the globe to create synchronized regional climate impacts and extremes, and which modeling/attribution approaches correctly capture those causal pathways?

Atmospheric teleconnections

Atmospheric teleconnections are relationships between weather or climate anomalies separated by large distances. They arise through atmospheric circulation changes and can persist from weeks to months. Well-known examples include ENSO-related effects, the North Atlantic Oscillation, and the Pacific–North American pattern. Atmospheric waves, storm tracks, and tropical–extratropical interactions help transmit these effects. Teleconnections can provide regional weather and climate predictability, but researchers emphasize that identifying and quantifying specific causal pathways remains difficult. The main difference between the perspectives is emphasis: the mainstream account explains established physical patterns, while the critical account stresses attribution limits, interacting pathways, and uncertainty about how warming may alter them.

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ENSO impacts

ENSO is a recurring, irregularly timed interaction between tropical Pacific ocean temperatures and atmospheric circulation. El Niño and La Niña alter winds, rainfall, temperature, and storm tracks, producing effects far beyond the Pacific. Observed impacts vary by phase, season, region, event strength, and decade. Examples include shifts in North American winter weather and rainfall anomalies across several African regions, with implications for water, agriculture, hazards, and ecosystems. Recent research cautions against treating ENSO as a simple regional forecast rule: California precipitation and African rainfall depend on interacting climate modes and event characteristics, and seasonal forecasts can be substantially wrong. The main disagreement concerns how ENSO should be defined and explained, how much its impacts can be predicted or attributed, and whether external forcings such as aerosols or astronomical cycles play a major causal role alongside internal ocean-atmosphere dynamics.

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Atmospheric waves

Atmospheric waves are periodic disturbances in atmospheric pressure, temperature, wind, or geopotential height. They may travel or remain stationary, and range from planetary waves to sound waves. They can be generated by heating, convection, mountains, volcanic eruptions, or other dynamical disturbances, and they transport momentum that can alter the background atmospheric flow. Research commonly uses linear or weakly nonlinear wave theories, while some studies argue that turbulence and scaling require an emergent, fractional description instead. The main point of disagreement is not whether atmospheric waves exist, but how best to model their nonlinear, turbulent behavior and distinguish similar-looking phenomena such as gravity waves and inertial instability.

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Teleconnection-driven extremes

Research finds that extreme rainfall, heatwaves, droughts and floods can be synchronized across distant regions through atmospheric teleconnections, but the physical pathways and their importance vary by event and timescale. The mainstream research account uses observations, reanalysis, models and causal-analysis methods to connect extremes with Rossby waves, ENSO, MJO-related heating and other circulation patterns. A significant methodological dissent argues that teleconnections should not be understood mainly as stationary, monthly-mean wave patterns: chains of synoptic weather events and non-stationary Rossby waves may be central. The main disagreement is whether conventional statistical and stationary-wave descriptions adequately capture the causal, weather-scale processes that generate teleconnected extremes.

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