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A Frequency-Dependent Description of Propagating Sea Level Signals in the Kuroshio Extension Region

机译：黑潮扩展区中传播的海平面信号的频率相关描述

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摘要

Hilbert empirical orthogonal function analysis is used to provide a frequency-dependent description of observed sea level variability in the Kuroshio Extension region, 1993-2012 inclusive. The dominant high-frequency mode (periods between 140 and 350 days) describes signals that propagate westward with the largest amplitudes in the vicinity of the Shatsky Rise and Emperor Seamounts. Based on the close correspondence between the variance of the high-frequency variability and the underlying bathymetry, it is speculated that this mode is driven by jet-bathymetry interactions. The dominant low-frequency mode (periods longer than 350 days) is explained in terms of wind-forced, jet-trapped Rossby waves that propagate along the mean Kuroshio Extension jet. One of the most surprising findings of this study is that sea level changes north of the jet in the meander region anticipate changes south of the jet by about 3 yr. Based on correlations of observed sea level with the Pacific decadal oscillation, and western boundary transport variability estimated from the Global Ocean Reanalysis and Simulations (GLORYS), it is speculated that this anticipation is due to the differences in time taken for (i) Rossby waves to travel from the eastern North Pacific to the meander region and (ii) the much faster barotropic response of western boundary transport, and sea level north of the jet, to large-scale forcing by the wind stress curl.
机译：希尔伯特经验正交函数分析用于对黑潮扩展区（包括1993年至2012年）中观测到的海平面变化提供频率相关的描述。占主导地位的高频模式（介于140天到350天之间）描述了在Shatsky Rise和Emperor Seamounts附近以最大幅度向西传播的信号。基于高频可变性的方差与基础测深法之间的紧密对应关系，可以推测这种模式是由射流测深法相互作用驱动的。主要的低频模式（周期超过350天）用沿平均黑潮扩展射流传播的受力射流束缚的Rossby波解释。这项研究最令人惊讶的发现之一是，在蜿蜒区域，喷流以北的海平面变化预计将在喷流以南约3年的变化。根据观测到的海平面与太平洋年代际振荡的相关性，以及根据全球海洋再分析和模拟（GLORYS）估算的西部边界输运变异性，可以推测，这种预期是由于（i）Rossby波所用的时间不同从北太平洋东部到曲折地区旅行；（ii）对西部边界运输以及急流以北的海平面对风应力卷曲产生的大规模强迫的正压响应要快得多。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第6期|1614-1635|共22页
  • 作者

    Hongyang Lin; Keith R. Thompson; JlANYU HU;

  • 作者单位

    State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University,Xiamen, Fujian, China;

    Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, Canada;

    State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University,Xiamen, Fujian, China College of Ocean and Earth Sciences, Xiamen University, 182 Daxue Road, Xiamen,Fujian 361005, China;

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