A Multidimensional Spectral Description of Ocean Variability

Cimarron Wortham; Carl Wunsch

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A Multidimensional Spectral Description of Ocean Variability

机译：海洋变化的多维光谱描述

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An updated empirical, analytical model for the frequency and wavenumber distribution of balanced motion in the ocean is presented. The spectrum model spans periods longer than the inertial but shorter than a decade and wavelengths between 100 and 10000 km. Assuming geostrophic dynamics, a spectrum model for the streamfunction is constructed to be consistent with a range of observations, including sea surface height from satellite altimetry, velocity from moored and shipboard instruments, and temperature from moorings. First-order characteristics of the observed spectra, including amplitude and spectral moments, vary slowly geographically. The spectrum model is horizontally anisotropic, accommodating observations that zonal wavenumber-frequency spectra are dominated by a "nondispersive line." Qualitative and quantitative agreement is found with one-dimensional frequency and wavenumber spectra and observed vertical profiles of variance. Illustrative application is made of the model spectrum to observing-system design, data mapping, and uncertainty estimation for trends.

机译：提出了一种更新的经验分析模型，用于海洋中平衡运动的频率和波数分布。光谱模型的周期长于惯性，但短于十年，波长在100至10000 km之间。假设具有地转动力学，则构造流函数的频谱模型以使其与一系列观测值保持一致，这些观测值包括卫星测高仪的海面高度，系泊设备和舰船仪表的速度以及系泊设备的温度。观察到的光谱的一阶特征（包括振幅和光谱矩）在地理上缓慢变化。频谱模型是水平各向异性的，可以适应这样的观察：纬向波数-频谱由“非分散线”控制。通过一维频率和波数频谱以及观察到的垂直方差曲线，发现了定性和定量的一致性。模型频谱在观测系统设计，数据映射以及趋势的不确定性估计方面具有说明性的应用。

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《Journal of Physical Oceanography》 |2014年第3期|944-966|共23页
作者
Cimarron Wortham; Carl Wunsch;
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作者单位

Applied Physics Laboratory, University of Washington, 1013 NE 40th St., Seattle, WA 98105;

Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts;

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A Multidimensional Spectral Description of Ocean Variability

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