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首页> 外文期刊>Estuarine Coastal and Shelf Science >Temporal variability of the mass exchanges between the main inlet of Ria Formosa lagoon (southwestern Iberia) and the Atlantic Ocean
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Temporal variability of the mass exchanges between the main inlet of Ria Formosa lagoon (southwestern Iberia) and the Atlantic Ocean

机译：Ria Formosa泻湖（西南伊比利亚）主要入口和大西洋之间质量交换的时间变化

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摘要

Understanding the mass exchange patterns between coastal lagoons and ocean plays a key role to explain their impact upon the water quality and biological productivity of these systems. Ria Formosa is a temperate lagoon on the southwestern coast of Iberia, one of the most important coastal system in this region in terms of biological productivity, ecological and economic values. Given its relevance and strong interconnectivity with the adjoining ocean, the quantification of these exchanges is a key issue that had not yet been thoroughly addressed. In this context, this study is focused on understanding the role of Ria Formosa's main inlet in terms of mass budgets dynamics of water, nutrients, suspended solids and chlorophyll a with the Atlantic Ocean and to identify its seasonal variability. In order to attain this purpose, the influence of the forcing mechanisms at different time scales, including tides, oceanographic/meteorological synoptic conditions and seasons, was assessed. To accomplish this, six semidiurnal tidal cycles surveys were conducted at Faro-Olhao inlet, comprising hourly water samples collection and in situ measurements at a selected cross-section of the inlet channel. Results revealed that mass exchanges variability through Faro-Olhao inlet was mainly due to oceanographic processes (upwelling and coastal countercurrent events) and, secondly, to phytoplankton activity within the lagoon. Seasonally, regardless the direction of the residual current through the inlet, Ria Formosa acted as a source of material during Spring and Summer seasons, which contributed to increase the biological productivity of the coastal ocean. Upwelling events that occurred more evidently during the Autumn survey drove an import amount of nutrients into the lagoon, enhancing its biological productivity. Furthermore, the rainfall period that prevailed before the Winter survey contributed to export material and nutrients to the adjacent ocean, confirming that Ria Formosa fertilizes the coastal ocean, even during a period of low productivity.
机译：了解沿海泻湖和海洋之间的质量交换模式在解释其对这些系统的水质和生物生产力的影响方面起着关键作用。 Ria Formosa是伊比利亚西南海岸的温带泻湖，就生物生产力，生态和经济价值而言，它是该地区最重要的沿海系统之一。鉴于其重要性以及与毗邻海洋的紧密联系，对这些交流的量化是一个尚未彻底解决的关键问题。在这种情况下，本研究着重于了解Ria Formosa主要进水口在大西洋的水，养分，悬浮固体和叶绿素a的总体预算动态方面的作用，并确定其季节性变化。为了达到这个目的，评估了不同时间尺度上强迫机制的影响，包括潮汐，海洋/气象天气条件和季节。为此，在法鲁奥洛（Faro-Olhao）进口处进行了六个半日式潮汐周期调查，包括每小时的水样采集和在进口通道选定横截面的原位测量。结果表明，通过法鲁-奥洛（Faro-Olhao）入口的物质交换变化主要是由于海洋学过程（上升流和沿海逆流事件），其次是泻湖内的浮游植物活动。从季节上看，不管残留电流流过进口的方向如何，福尔摩沙（Ria Formosa）在春季和夏季都充当了物质来源，这有助于增加沿海海洋的生物生产力。秋季调查期间发生的上升流事件更加明显，驱使大量营养物质流入泻湖，从而提高了泻湖的生物生产力。此外，冬季调查之前的降雨时期促使向邻近的海洋输出物质和养分，这证明即使在生产力低下的时期，福尔摩沙（Ria Formosa）也为沿海海洋施肥。

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