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首页> 外文期刊>Journal of Physical Oceanography >Gulf Stream Meander Propagation Past Cape Hatteras
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Gulf Stream Meander Propagation Past Cape Hatteras

机译：墨西哥湾沿哈特拉斯角蜿蜒传播

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摘要

The propagation and growth characteristics of Gulf Stream meanders past the stream's separation point at Cape Hatteras are analyzed using yearlong time series from a mooring program sponsored by the Minerals Management Service, which included moorings imbedded in the Gulf Stream cyclonic flank both upstream (south) and downstream (north) of Cape Hatteras. In the upstream region, energetic meanders of 3-8-day period, 180-380-km wavelength propagate downstream along the Gulf Stream at speeds of 40-55 km day~(-1). This variability decays almost completely across the Gulf Stream separation, with growth in lower-frequency variability (30-120 day) in the downstream direction. Wavelength and phase speed in the 3-8-day band are strong functions of frequency, with increasing phase speed for increasing wavenumber. Phase speeds upstream from Cape Hatteras and across the Gulf Stream separation point are faster for a given wavenumber than downstream from Cape Hatteras, in keeping with prior published estimates. At the upstream end of the study site, both baroclinic and barotropic mechanisms contribute to the decay of 3-8-day meanders and growth of lower-frequency 30-120-day variability in the downstream direction. At the downstream end of the study region, the reverse holds, with both baroclinic and barotropic mechanisms contributing to growth of 3-8-day meanders and decay of lower-frequency 30-120-day variability.
机译：使用矿产管理处赞助的系泊计划的长达一年的时间序列分析了墨西哥湾流经过哈特拉斯角分离点之后的传播和生长特征，该系泊程序包括在上游（南部）和南部的湾流气旋侧翼内系泊的系泊设备。哈特拉斯角的下游（北部）。在上游地区，3-8天周期，180-380-km波长的高能量曲折沿墨西哥湾流向下游传播，速度为40-55 km / d〜（-1）。在墨西哥湾流域的整个分离过程中，这种变化几乎完全衰减了，而下游方向的低频变化（30-120天）则有所增加。 3-8天波段中的波长和相速度是频率的强函数，随着相速度的增加，波数增加。在给定的波数下，哈特拉斯角上游和跨墨西哥湾流分离点的相速度比哈特拉斯角下游的相速度快。在研究地点的上游端，斜压和正压机制都导致3-8天的曲折衰减和下游方向30-120天低频变化的增长。在研究区域的下游，反斜率保持不变，斜压和正压机制都有助于3-8天的曲折增长和30-120天低频变化的衰减。

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