Abstract Using a three-dimensional general circulation model, we show that the atmospheric dynamics on tidally locked Earth-like exoplanet, simulated with planetary and orbital parameters of Proxima Centauri b, support longitudinally asymmetric stratospheric wind oscillation (LASO), analogous to Earth’s quasi-biennial (QBO). In our simulations, LASO has vertical extent 35–55 km, period 5–6.5 mo...