Lagrangian Analysis of Atmospheric Cyclones

Lagrangian analysis offers a particle-based perspective on the complex flow structures within extratropical and tropical cyclones by following individual air parcels through time. Unlike Eulerian methods, which inspect fixed points in space, a Lagrangian framework traces trajectories to uncover the origin, evolution and fate of moisture, potential vorticity anomalies and diabatic heating processes. This approach has proved particularly powerful in identifying warm conveyor belts, dry intrusions and stratosphere–troposphere exchange pathways that control cyclone development, precipitation extremes and downstream weather impacts. By decomposing the contributions of adiabatic transport, latent-heat release and radiative heating along parcel paths, researchers can quantify how air masses acquire stability or instability, modify the upper‐level jet stream and trigger heavy rainfall events. Lagrangian tools have been applied from regional convection-permitting models to global reanalyses, enabling both case studies of individual severe storms and climatological assessments of cyclone behaviour under present and future climate conditions. The insights gained inform improvements in weather forecasting, risk assessment of extreme events and the representation of moist processes in numerical models.

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Lagrangian Analysis of Atmospheric Cyclones publication trend

The graph below shows the total number of articles in lagrangian analysis of atmospheric cyclones across all publications each year (not limited to Nature Index journals).

Technical terms

Lagrangian trajectory: The path of an individual air parcel through the atmosphere, determined by integrating wind fields over time.

Warm conveyor belt (WCB): A slantwise-ascending airstream in extratropical cyclones responsible for most of their cloud formation, latent-heat release and precipitation.

Potential vorticity (PV): A conserved quantity combining vorticity and stratification, used to characterise air‐mass evolution and flow stability on isentropic surfaces.

Diabatic heating: The change of an air parcel’s temperature through non-adiabatic processes such as latent-heat release, radiation or turbulent mixing.

References

1. The LAGRANTO Lagrangian analysis tool – version 2.0. Geoscientific Model Development (2015).
2. Warm conveyor belts in present-day and future climate simulations – Part 1: Climatology and impacts. Weather and Climate Dynamics (2023).
3. Potential vorticity structure of embedded convection in a warm conveyor belt and its relevance for large-scale dynamics. Weather and Climate Dynamics (2020).