Observations on Propagation and Growth of Gulf Stream Meanders
Observations on Propagation and Growth of Gulf Stream Meanders
复制标题
墨西哥湾流曲流传播和增长的观测
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
W. Johns
中科院分区：
文献类型：
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作者：
D. Watts;W. Johns
翻译后摘要：提出了一种新的方法，用于连续跟踪墨西哥湾流的位置，使用一个停泊阵列的倒置回声测深仪（IES）。沿北卡罗来纳州哈特拉斯角下游（NE）间隔100、150和200 km的沿着三个剖面收集了精确到+或- 8 km的前缘横向位移时间序列，为期12个月。这些记录在超过4天的所有周期内都是高度一致的。从所观察到的相位滞后的色散关系的曲折。随着周期和波长从4天150 km增加到33天600 km，相速度从40 km/d平稳地减小到20 km/d。曲折表现出快速增长的周期超过4天，增加一倍的方差在每50公里的步骤下游。
Abstract : A new method is presented for continuously tracking the location of the Gulf Stream using a moored array of inverted echo sounders (IES). Time series of lateral displacements of the front, shown accurate to + or - 8 km, have been collected along three sections spaced 100, 150 and 200 km downstream (NE) of Cape Hatteras, NC for a period of 12 months. These records are highly coherent at all periodicities longer than 4 days. From the observed phase lags a dispersion relationship is presented for the meanders. As the period and wavelength increase from (4 days, 150 km) to (33 days, 600 km) the phase speed decreases smoothly from 40 km/d to 20 km/d. The meanders exhibited rapid growth at periods longer than 4 days, doubling in variance in each 50 km step downstream.