Small-scale motions observed by aircraft in the tropical lower stratosphere - Evidence for mixing and its relationship to large-scale flows
Small-scale motions observed by aircraft in the tropical lower stratosphere - Evidence for mixing and its relationship to large-scale flows
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飞机在热带低平流层观测到的小规模运动——混合的证据及其与大规模流动的关系
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
M. Legg
中科院分区：
文献类型：
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作者：
L. Pfister;W. Starr;R. Craig;M. Loewenstein;M. Legg
对热带低平流层仪器飞机的温度和臭氧的测量表明，存在由1)底层积云对流和2)Kelvin-Helmholtz不稳定性产生的小尺度扰动。与下伏对流有关的扰动具有从峰到峰的垂直漂移∼300m。飞行条件平稳，表明存在重力波集合，很少或没有湍流混合。然而，这些波仍有可能在其他高度破裂，导致湍流混合和垂直分层示踪物的净通量。归因于KH不稳定的扰动意味着垂直漂移300-400米。这些扰动与恶劣的飞行条件相吻合，表明湍流混合。对高分辨率探空仪定义的大气基本态进行了线性稳定性分析，得到了水平波长为1.4-1.8公里的最快增长波，这与飞机观测结果一致。强者负责..。
Abstract Measurments of temperature and ozone from instrumental aircraft in the tropical lower stratosphere show the presence of small-scale disturbances generated by 1) underlying cumulus convection and 2) Kelvin-Helmholtz instability. The disturbances associated with underlying convection have peak-to-peak vertical parcel excursions of ∼300 m. Flying conditions were smooth, suggesting an ensemble of gravity waves and little or no turbulent mixing. It is nevertheless possible that these waves break at other altitudes, leading to turbulent mixing and net fluxes of vertically stratified tracers. Disturbances attributed to KH instability implied vertical parcel excursions of 300–400 m. The disturbances coincided with rough flying conditions, suggesting turbulent mixing. A linear stability analysis of the atmospheric basic state defined by high-resolution radiosondes shows fastest growing waves with horizontal wavelengths of 1.4–1.8 km, consistent with the aircraft observations. The strong shears responsible...