Departamento de Física and CESAM, Universidade de Aveiro, Aveiro, Portugal.
Instituto de Investigaciones Marinas (CSIC), Vigo, Spain.
PLoS One. 2018 May 17;13(5):e0197627. doi: 10.1371/journal.pone.0197627. eCollection 2018.
The hydrography and dynamics of NW Iberian margin were explored for July 2009, based on a set of in situ and remote sensing observations. Zonal sections of standard CTD casts, towed CTD (SeaSoar), Acoustic Doppler Current Profilers (ADCP) and Lagrangian surveys were made to characterize cycles of upwelling and relaxation in this region. Two periods of northerly winds, bounded by relaxation periods, were responsible for the formation of an upwelling front extending to the shelf edge. An equatorward flow was quickly set up on the shelf responding to the northerly wind pulses. South of Cape Silleiro, the development and subsequent relaxation of an upwelling event was intensively surveyed in the shelf, following a Lagrangian drifter transported by the upwelling jet. This region is part of an upwelling center extending from Cape Silleiro to Porto, where the surface temperature was colder than the neighboring regions, under upwelling favorable winds. As these winds relaxed, persistent poleward flow developed, originating south of the upwelling center and consisting in an inner-shelf tongue of warm waters. During an event of strong southerly wind, the poleward flow was observed to extend to the whole continental shelf. Although the cruise was executed during summertime, the presence of river-plumes was observed over the shelf. The interaction of the plumes with the circulation on the shelf was also described in terms of coastal convergence and offshore advection. The sampling of the offshore and slope regions showed the presence of the Iberian poleward current offshore and a persistent equatorward flow over the upper slope.
基于一系列现场观测和遥感观测数据，我们对 2009 年 7 月西北伊比利亚边缘的水文学和动力学进行了研究。我们制作了标准 CTD 投弃式剖面仪（CTD）、拖曳式 CTD（SeaSoar）、声学多普勒海流剖面仪（ADCP）和拉格朗日调查的纬向剖面，以描述该区域的上升流和松弛循环。两次北风期间，被松弛期间所限制，这导致了上升流锋面延伸到陆架边缘。在北风脉冲的响应下，陆架上迅速形成了向赤道的流。在锡列罗角以南，我们对陆架上上升流事件的发展和随后的松弛进行了密集调查，使用上升流射流携带的拉格朗日漂流器进行。该区域是从锡列罗角到波尔图的上升流中心的一部分，在这里，上升流有利风下的海面温度比邻近地区更冷。随着这些风的放松，持久的向极流发展起来，起源于上升流中心的南部，由温暖水的内陆架舌组成。在强南风事件中，观察到向极流延伸到整个大陆架。尽管巡航是在夏季进行的，但在陆架上观测到了河流羽流的存在。还根据沿海辐合和离岸平流描述了羽流与陆架环流的相互作用。对近海和斜坡区域的采样表明，在近海存在伊比利亚向极流，在上斜坡上存在持久的向赤道流。
