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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >The Guajira upwelling system
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The Guajira upwelling system

机译：瓜伊吉拉上升流系统

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The coastal upwelled waters of the Guajira coast, the most northerly peninsula of South America, were studied on the basis of historical data bases, remotely sensed data, and three oceanographic cruises. The Guajira Peninsula is the locus of particularly strong upwelling because it protrudes into the Caribbean Low-Level Wind Jet and its west coast parallels the direction of the strongest winds. The year-round upwelling varies with the wind forcing: strongest in December-March and July, and weakest in the October-November rainy season. The east-west temperature, salinity and density front that delimits the upwelling lies over the shelf edge in the east of the peninsula but separates from the south-westward trending topography to the west. A coastal westward surface jet geostrophically adjusted to the upwelling flows along the front, and an eastward sub-surface counterflow is trapped against the Guajira continental slope. The undercurrent shoals toward the western limit of the upwelling, Santa Marta, beyond which point it extends to the surface. Some of the westward jet re-circulates inshore with the counterflow but part continues directly west to form an upwelling filament. Much of the mesoscale variation is associated with upwelling filaments, which expel cooler, chlorophyll- rich coastal upwelling waters westward and northward into the Caribbean Sea. Freshwater plumes from the Magdalena and Orinoco rivers influence the area strongly, and outflow from Lake Maracaibo interacts directly with upwelled waters off Guajira. Another important factor is the Aeolian input of dust from the Guajira desert by episodes of offshore winds. (c) 2005 Elsevier Ltd. All rights reserved.
机译：在历史数据库，遥感数据和三次海洋航行的基础上，对南美最北端的瓜希拉（Guajira）海岸沿海上升水域进行了研究。瓜伊吉拉半岛上升势特别强，因为它突入加勒比海低空急流，其西海岸与最强风向平行。全年的上升流随风力的变化而变化：12月至3月和7月最强，10月至11月的雨季最弱。界定上升流的东西向温度，盐度和密度前沿位于半岛东部的陆架边缘之上，但与西南向的趋势地形分开。沿地势调整后沿海岸向上流动的沿海西向表面射流，向东的次表层逆流被困在Guajira大陆斜坡上。暗流流向上升流的西部边界圣玛尔塔，超过该点则延伸到地面。一些向西的射流与逆流一起在近岸再循环，但一部分继续直接向西延伸，形成上升流的细丝。中尺度变化的大部分与上升流的细丝有关，这些细丝将较冷，富含叶绿素的沿海上升流向西和向北排入加勒比海。来自马格达莱纳河和奥里诺科河的淡水羽流对该地区产生了强烈影响，马拉开波湖的流出物与瓜希拉附近的上升流直接相互作用。另一个重要因素是海上风的侵袭使瓜吉拉沙漠的风尘进入。 （c）2005 Elsevier Ltd.保留所有权利。

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