Lagrangian Coherent Structures and Vortex Formation in High Spatiotemporal‐Resolution Satellite Winds of an Atmospheric Kármán Vortex Street

T. Günther, Á. Horváth, W. Bresky, J. Daniels, S. A. Buehler
2021 Journal of Geophysical Research - Atmospheres  
Vortex streets formed in the cloudy wake of mountainous islands are the analogs of the classic Kármán vortex street observed in laboratory bluff-body flows. Atmospheric vortex streets develop in conditions characterized by a well-mixed subcloud layer capped by a strong temperature inversion with a weaker stably stratified layer above and consist of mesoscale eddies, which span the entire marine boundary layer and have a nearly upright axis with no height variation in their properties (i.e.,
more » ... are approximately 2D). Although the spatial arrangement (aspect ratio) of these spectacular vortex patterns has been studied ever since their first photographs were obtained at the dawn of the satellite era (e.g., Chopra & Hubert, 1965; Hubert & Krueger, 1962; Lyons & Fujita, 1968; Young & Zawislak, 2006) , advances in modeling and observational capabilities have recently led to a renewed interest specifically in their dynamics. Numerical forecast models and large-eddy simulations are now capable of handling spatial grid resolutions at the lower end of the meso-gamma scale (2-20 km) in a sufficiently large domain (hundreds of kilometers on a side) required for the realistic modeling of island wakes (
doi:10.1029/2021jd035000 fatcat:csimqvjhkvgmdiz72y5nplf3wu