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本文对澳大利亚悉尼外海陆架区上历时9天的浅海锚系海流计资料作了谱分析。得出,观测得到的脉动可能是内波,其低频分量以相速0.55m/s垂直于等深线向岸传播。不同于大洋内波谱特性,观测得到的温度谱呈ω-3/2律,并在ω=N处有急剧下降,而水平动能谱在低频段呈ω-5/2律,在高频段呈ω-4/8律。观测得到内波的总能量约为GM谱的1/2,可以认为上述与GM谱之偏离是由于从远处传入之内波的耗散,浅海局地生成的内波以及细结构污染等因素所致。 相似文献
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本文利用一些复随机变量的分布和统计推断理论,导出了向量过程的正旋谱、负旋谱、谱差、总谱、外自谱、频域外自相关函数、外自谱的位相函数等估计量的渐近分布以及它们的置信区间,并简略地讨论了所得置信区间的最优性。最后用锚系海流计资料实例说明了所得置信区间公式在海流资料分析中的应用。 相似文献
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Some approximate formulas , based on the internal- wave directional spectral model established by Schott and Willebrand (1973), of vertically standing wavemode eigenfunctions and a dispersion relation of internal waves in shallow seas are presented . An optimization method to estimate internal wave directional spectra is described and the confidence interval expression of the estimates is estab -lished .The GM spectral model of oceanic internal waves cannot be used in shallow seas (01 bers, 1983). Internal waves in shallow seas have two origins: oceanic (those generated in and propagating from the deep sea and ocean) and local (Phillips, 1977). As both reveal obvious propagation orientations, it is important to investigate the directional properties of the internal wave field . Though cross- correlation function or cross-spectrum analyses can reveal the directional properties in some degree (Fang et al., 1984, and Fang, 1987), internal-wave directional spectrum analysis can further estimate the main pro 相似文献
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旋转向量水平分量对大洋内波方程的影响 总被引:8,自引:1,他引:7
在物理海洋学问题中,一般地采用固结在所研究海区中的直角笛卡尔坐标系(f-平面或β户平面近似),即原点在无扰动海面,z,y,x轴分别为向东、向北和向上. 相似文献
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依据在作者的前文(1998)中对于考虑旋转向量水平分量(f~)的大洋内波方程求出的渐近解,文中对S场(考虑f~条件下的总的内波场),SI场(不计f~影响的内波场)和SF场(S场中与f~相关联的部分)导出了能量谱和相干谱。此理论谱与Muler等(1978)的IWEX实验的观测结果相比较表明,SF场的水平动能谱和铅直位移谱基本上与水平流细结构和铅直位移细结构的观测谱一致。作者推测SF场对应于中纬度大洋可逆细结构。但是对于相干谱的观测结果,在不考虑内波非线性相互作用和破碎过程的条件下,仅考虑SF场的影响还不能给予满意的解释。 相似文献
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A two-dimensional spectral-difference mode (with vorticity and density equations) of internal tides isdeveloped for studying the genration and propagration of internal tides generated at the continentalshelf/slope. In general, internal tides propagate seaward in deep sea regions and shoreward on the shelf,and are dissipated rapidly. When the Vaisala frequency decreases vertically, waves may be mostly limited to thecontinental slope region. in deep sea region, motions may have either boam-like structure or modal structure,depending on the stratification strerigth and structure, whereas a modal structure may always exist onthe shelf. Waves show strong bottom intensification on the slope when strong stratification exists on thebottom. The barotropic tidal advection may affed the temporal character of internal tides at thecontinental slope, shelf break and shelf regions. but may have little influence on the energy density and energy flux of internal tides. ln the case of strong stratification, waverforms of 相似文献
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Eighy-one CTD profiles gathered in springtime were used for northem East China Sea tbermohalinefinestructure studies indicating that the finestructure properties vaned with region and depth, as shown infinesructure specra, distribution of Cox numbers etc..Some results closely wiated to distribution of watermasses and Analysis of two typical profiles revealed differenes in autospectra of temperature,salihity and potential density gradients, probobility distribution of temperature finestructure gradient,Cox numberc.etc. The probability density function of vertical temperature gradients, which varied withsample interval, is given. The variances of temperatare finestructare gradient are used to estimate the lat-eral diffusivity and lateral temperatare flux, which were 10.3 (m~2/s) and 5.5×10~(-4) (℃ m/s),respectivly. 相似文献
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赤道附近141°30'E断面温盐细结构特性 总被引:2,自引:0,他引:2
根据中美海气TOGA调查第1~4航次(1986~1988年)的CTD资料及部分ADCDCP资料,分析研究横跨赤道141°30'E断面的内波及细结构特性,其中包括温度垂直梯度的概率分布及其谱特性,COX数的统计分布及Richardson数的垂直分布等,由此得出;该断面存在入侵性细结构、双跃层及阶梯结构;温度垂直梯度谱在波数0.1附近有一折点K1,按谱斜率不同将谱分为3段,当0.031时,β<1;当K1相似文献
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