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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >The modulation of the seasonal cross-shelf sea level variation by the cold pool in the Middle Atlantic Bight
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The modulation of the seasonal cross-shelf sea level variation by the cold pool in the Middle Atlantic Bight

机译：中大西洋海岸线冷池对季节性跨架海平面变化的调节

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摘要

This study explores the influence of the cold pool in the Middle Atlantic Bight (MAB) to crossshelf sea surface slope by fitting an annual harmonic to temperature and salinity profiles from 1993 to 2012 and compares to the 20 year averaged altimetry sea level anomaly (SLA). The consistency within the bottom temperature, thermal steric height, total steric height, and altimetry observation validates that the cold pool induces a depressed sea level in the middle shelf overlapping with the dominant surface seasonal cycles. Temporally, the cold pool pattern is most apparent in July and August as a result of magnitude competition between the thermal and haline steric height. In addition, Ensemble Empirical Mode Decomposition (EEMD) is employed to reconstruct the altimetry SLA and reveals the middle-shelf depression pattern from single year's SLA data. The locations of the SLA depression from 1993 to 2012 agree with the cold pool locations identified from in situ measurements, suggesting a promising application of altimetry SLA in the cold pool study. Conclusively, this study reveals the modulation of the cross-shelf sea level variation by the cold pool, and contributes to the understanding of the sea level response to water masses on the continental shelf.
机译：这项研究通过将1993年至2012年的年谐波拟合到温度和盐度剖面图，探索了中大西洋海岸线（MAB）的冷池对跨架海面坡度的影响，并与20年平均测高海平面异常（SLA）进行了比较。底部温度，热空间高度，总空间高度和测高仪观测值之间的一致性验证了冷池在中陆架上诱发了海平面下降，并与主要地表季节周期重叠。暂时而言，由于热和卤代空间高度之间的量级竞争，冷池模式在7月和8月最为明显。此外，采用集成经验模态分解（EEMD）来重建测高仪的SLA，并从单年的SLA数据揭示了中层架凹陷模式。从1993年到2012年，SLA凹陷的位置与从原位测量中确定的冷池位置一致，这表明高空SLA在冷池研究中有希望的应用。结论是，这项研究揭示了冷池对跨架海平面变化的调节作用，并有助于了解海平面对大陆架水团的响应。

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