Stratospheric horizontal wavenumber spectra of winds, potential temperature, and atmospheric tracers observed by high-altitude aircraft
Stratospheric horizontal wavenumber spectra of winds, potential temperature, and atmospheric tracers observed by high-altitude aircraft
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DOI：
10.1029/95jd03835
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发表时间：
1996-04
影响因子：
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通讯作者：
J. Bacmeister;S. Eckermann;P. Newman;L. Lait;K. R. Chan;M. Loewenstein;M. Proffitt;B. Gary
中科院分区：
文献类型：
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作者：
J. Bacmeister;S. Eckermann;P. Newman;L. Lait;K. R. Chan;M. Loewenstein;M. Proffitt;B. Gary
摘要/ Abstract摘要：研究了ER-2型飞机73次飞行（飞行高度约为海拔高度）在平流层中部测得的垂直和水平风速、潜在温度、臭氧和N(2)O混合比的水平波数功率谱。20公里)。在100至1 km波长范围内的速度和势温光谱明显偏离了二维湍流逆能量级联状态和惯性范围三维湍流所期望的均匀-5/3幂律。相反，在小于3 km的水平尺度上，对于所有速度分量和潜在温度，观察到近似符合-3幂律的陡峭谱。在超过6公里的尺度上观测到较浅的光谱。水平速度和位温在较长尺度上的光谱指数在-1.5 ~ -2.0之间。对于垂直速度，较长尺度上的谱变平。认为观测到的速度和位温谱与引力波一致。在较小的尺度上，这些形状也表面上符合湍流和/或非线性重力波的Lumley-Shur-Weinstock浮力子范围。在100 ~ 1 km波长范围内，臭氧和N(sub - 2)O混合比的同期光谱符合近似均匀的-5/3幂律。认为这可能反映了熵级联二维湍流产生的微量气体混合比场中重力波气包位移与层流或丝状结构之间的相互作用。
Abstract : Horizontal wavenumber power spectra of vertical and horizontal wind velocities, potential temperatures, and ozone and N(2)O mixing ratios, as measured in the mid-stratosphere during 73 ER-2 flights (altitude approx. 20km) are presented. The velocity and potential temperature spectra in the 100 to 1-km wavelength range deviate significantly from the uniform -5/3 power law expected for the inverse energy-cascade regime of two-dimensional turbulence and also for inertial-range, three-dimensional turbulence. Instead, steeper spectra approximately consistent with a -3 power law are observed at horizontal scales smaller than 3 km for all velocity components as well as potential temperature. Shallower spectra are observed at scales longer than 6 km. For horizontal velocity and potential temperature the spectral indices at longer scales are between -1.5 and -2.0. For vertical velocity the spectrum at longer scales become flat. It is argued that the observed velocity and potential temperature spectra are consistent with gravity waves. At smaller scales, the shapes are also superficially consistent with a Lumley-Shur-Weinstock buoyant subrange of turbulence and/or nonlinear gravity waves. Contemporaneous spectra of ozone and N(sub 2)O mixing ratio in the 100 to 1-km wavelength range do conform to an approximately uniform -5/3 power law. It is argued that this may reflect interactions between gravity wave air-parcel displacements and laminar or filamentary structures in the trace gas mixing ratio field produced by enstropy-cascading two-dimensional turbulence.