Simulation of Atmospheric Ozone Layer Formation and Study on the Influence of Equatorial Atmospheric Vertical Motion on the Ozone Layer

Abstract. Stratospheric ozone is crucial for protecting terrestrial ecosystems and maintaining climate stability by absorbing solar ultraviolet radiation. Its distribution is jointly determined by photochemical reactions and atmospheric dynamic processes. Equatorial vertical motion, as a key component of global circulation, profoundly influences ozone production and depletion by regulating precursor transport, photolysis rates, and temperature fields. Based on the Chapman mechanism and catalytic reaction theory, this study establishes a photochemical-dynamic coupled numerical model covering the surface to 500 km, simulating the formation process of the equatorial ozone layer. Through multiple controlled experiments, the effects of vertical motions with different intensities are systematically quantified. Results demonstrate that vertical motion significantly reshapes the steady state and structure of the ozone layer: stronger motion leads to reduced ozone layer thickness, elevated concentration peak altitude, and a transition from multi-peak to nearly single-peak vertical distribution. Notably, the simulations reveal for the first time that in the absence of external dynamic forcing apart from Earth’s revolution around the Sun and its rotation, the ozone system itself exhibits an intrinsic oscillation period of approximately 31 months. Based on this finding, we propose a novel scientific hypothesis: this intrinsic period may serve as a "baseline frequency anchor" that facilitates research on the periods of the stratospheric Quasi-Biennial Oscillation (QBO) and the Tropospheric Biennial Oscillation (TBO). This suggests that the ozone layer may not be merely a passive responder within the climate system, but rather an active component with autonomous oscillation capability capable of modulating atmospheric circulation through radiative feedbacks. This study provides new numerical evidence and theoretical perspectives for understanding the spatiotemporal evolution of the ozone layer and stratosphere-troposphere interactions.