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MARINE GEOLOGY and GEOPHYSICS

机译:海洋地质与地球物理

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Three year long current-meter arrays were deployed in the Malvinas Current at 41 °S below a satellite altimeter track at about 10 years intervals. Surface geostrophic velocities (SGV) derived from satellite altimetric data are compared with the in situ velocities at the upper current meter (~300 m). Multisatellite gridded SGV compare better with in situ observations than along-track SGV. In spite of the proximity of the moorings to the complex Brazil-Malvinas Confluence (BMC) region, satellite SGV are significantly correlated with the 20 day low-passed in situ velocities (0.85 for along-isobaths velocities. 0.8 for cross-isobaths velocities). The recent in situ measurement period (2014-2015) stands out in the altimetry record with a long-lasting (4 months) high level of eddy kinetic energy at the mooring site and a southernmost location of the Subantarctic Front (SAF). The first two modes of variations of sea level anomaly (SLA) over the BMC remarkably match the first two modes of the low-passed in situ velocities. The first mode is associated with a latitudinal migration of the SAF, and the second with a longitudinal displacement of the Brazil Current overshoot. The two modes dominate the 24 year long record of SLA in the BMC. with energy peaks at the annual and semiannual periods for the first mode and at 3-5 months for the second mode. The SLA over the Southwest Atlantic was regressed onto the two confluence modes of SLA variations and showed remarkable standing wave train like structures in the Argentine Basin.
机译:在卫星高度计轨道下方41°S处的马尔维纳斯洋流中部署了长达三年的电流表阵列,间隔约10年。将来自卫星测高数据的地表地转速度(SGV)与上部电流表(〜300 m)的原地速度进行比较。多卫星网格SGV与原位观测的比较要好于沿轨SGV。尽管系泊设备靠近复杂的巴西-马尔维纳斯汇合(BMC)地区,但卫星SGV仍与20天低通原位速度显着相关(沿等速通道的速度为0.85,等速通道的速度为0.8)。 。最近的原位测量期(2014-2015年)在测高记录中脱颖而出,在系泊点和亚南极锋(SAF)的最南端位置持续(4个月)高涡动能。 BMC上海平面异常(SLA)的前两种变化模式与低通原位速度的前两种变化模式显着匹配。第一种模式与SAF的纬向偏移有关,第二种模式与巴西洋流过冲的纵向偏移相关。这两种模式主导了BMC长达24年的SLA记录。在第一种模式的年度和半年度能量峰值,在第二种模式的3-5个月能量峰值。西南大西洋上的SLA回归到SLA变化的两种汇合模式,并在阿根廷盆地表现出非凡的驻波列状结构。

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    《Oceanographic Literature Review》 |2018年第2期|299-337|共39页
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