Temporal and Spatial Structure of the Equatorial Deep Jets in the Pacific Ocean
Temporal and Spatial Structure of the Equatorial Deep Jets in the Pacific Ocean
复制标题
太平洋赤道深急流的时空结构
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
D. Moore
中科院分区：
文献类型：
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作者：
G. Johnson;E. Kunze;K. E. McTaggart;D. Moore
摘要利用1979 - 2001年赤道CTD站资料，研究了太平洋赤道深急流的时空结构。EDJ显示在垂直应变的剖面中，从拉伸的垂直坐标系中的CTD数据估计。大部分天气纬向剖面在日期变更线以西的8年跨度内被占据。在西经110°和西经140°上都有20年赤道时间序列。分析表明，预期的赤道捕获的EDJ赤道结构，但几乎没有新的详细信息。对赤道数据的分析产生了新的结果。EDJ最容易在东太平洋（140°W及以东）看到。在那里，它们可以从由表面强迫产生的高频Rossby波的影响中分离出来。对赤道波的光谱分析表明，在95°W到142° W之间，在400 sdbar垂直波长处（No = 1.56 × 10−3 s−1）有一个显著的相干峰。
Abstract The spatial and temporal structure of the equatorial deep jets (EDJs) in the Pacific Ocean is investigated using CTD station data taken on the equator from 1979 through 2001. The EDJs are revealed in profiles of vertical strain, ξz, estimated from the CTD data in a stretched vertical coordinate system. The majority of synoptic meridional sections were occupied over an 8-yr span west of the date line. Two-decade equatorial time series are available at both 110°W and 140°W. Analysis shows the expected equatorial trapping of ξz but yields little new detailed information about the EDJ meridional structure. Analysis of the equatorial data yields novel results. The EDJs are most easily seen in the eastern Pacific (at and east of 140°W). There, they may be isolated from the influence of higher-frequency Rossby waves generated by surface forcing. Spectral analysis of equatorial ξz profiles shows a significant and coherent peak at 400-sdbar vertical wavelength (with No = 1.56 × 10−3 s−1) from 95°W to 142°...