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. A new free modular software package is described for tracking tropopausepolar vortices (TPVs) natively on structured or unstructured grids. Motivatedby limitations in spatial characterization and time tracking within existingapproaches, TPVTrack mimics the expected dynamics of TPVs to represent their(1) spatial structure, with variable shapes and intensities, and (2) timeevolution, with mergers and splits. TPVs are segmented from the gridded flowfield into spatial objects as restricted regional watershed basins on thetropopause, described by geometric metrics, associated over time by overlapsimilarity into major and minor correspondences, and tracked along majorcorrespondences. Simplified segmentation and correspondence test casesillustrate some of the appeal, sensitivities, and limitations of TPVTrack,including effective representation of spatial shape and reduced falsepositive associations in time. Tracked TPVs in more realistic historicalconditions are consistent in bulk with expectations of life cycle and meanstructure. Individual tracks are less reliable when discriminating amongmultiple overlaps. Modifications to track other physical features arepossible, with each application requiring evaluation.

TPVTrack v1.0: a watershed segmentation and overlap correspondence method for tracking tropopause polar vortices