Transport Dynamics in the Stratosphere

该项目的目标是使用二维（纬度-高度）化学动力学模型来研究模式模拟中平流层空气平均年龄的广泛变化的原因。当光化学过程沿着包裹轨迹发生时，平均年龄传达了在扩散存在的平流层下层包裹传输时间尺度的信息。将研究水平混合、平流层振荡（准两年一次和半年一次）和中间层光化学破坏对平流层空气平均年龄的影响。朱博士的理论和模型分析将有助于澄清空气年龄概念的物理和数学基础，并导致其更准确的估计。该奖项由大规模动态气象项目资助。

The goal of this project is to use a two-dimensional (latitude-height) chemical-dynamical model to investigate the reasons for wide variations in the mean-age of stratospheric air in model simulations. The mean-age conveys information about the parcel transport time scales in the lower stratosphere in the presence of diffusion, when photochemical processes occur along parcel trajectories. The impact of horizontal mixing, stratospheric oscillations (quasi-biennial and semi-annual), and mesospheric photochemical destruction on the mean-age of stratospheric air will be examined. Dr. Zhu's theoretical and modeling analysis will help clarify the physical and mathematical basis for the age-of-air concept, and lead to its more accurate estimation. The Large-scale Dynamic Meteorology Program funds this award.