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首页> 外文期刊>Estuarine Coastal and Shelf Science >Annual patterns of nutrients and chlorophyll in a subtropical coastal lagoon under the upwelling influence (SW of Baja-California Peninsula)
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Annual patterns of nutrients and chlorophyll in a subtropical coastal lagoon under the upwelling influence (SW of Baja-California Peninsula)

机译：上升流影响下亚热带沿海泻湖养分和叶绿素的年度格局（巴哈-加利福尼亚半岛西南部）

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摘要

The coastal lagoon of Bahia-Magdalena, located on the west coast of the Peninsula of Baja-California, is a subtropical ecosystem with an arid climate and very little freshwater input. During the 2005-2011 period the thermohaline properties varied between cold and warm half-yearly periods. They were influenced by the Transitional Water mass transported by the South California Current from February to July and by the Subtropical Surface Water from August to January. The nutrient concentrations increased (viz up to 16 μM of nitrate) from March to June, when the upwelling index was the highest. Similarly, the inter-annual variation of chlorophyll-a showed a six-monthly pattern with the highest average monthly concentrations being found in June (5 mg m~(-3) in situ or 8 mg m~(-3) based on satellite information) and the lowest in December-January. A spatial zoning was also observed in the lagoon with a shallow inner zone that is warmer and richer in chlorophyll-a than the deeper closed mouth area. In the Bahia-Magdalena lagoon a spatial-temporal division into two zones and two seasons was repeated year after year with only minor differences. During the first semester in the outer zone, years 2006 and 2007 were colder and nutrient rich while 2010 was warmer, according to the upwelling conditions in the Southern California Region. Hence, among the coastal lagoons that present a prevailing marine influence, the coastal system of Bahia-Magdalena corresponds to an unusual type of subtropical coastal lagoon where the nutrient input is mainly due to upwelling phenomena.
机译：巴伊亚-马格达莱纳州的沿海泻湖位于巴哈-加利福尼亚半岛的西海岸，是一个亚热带生态系统，气候干旱，几乎没有淡水输入。在2005-2011年期间，热盐的性质在冷半年和暖半年之间变化。它们受到2月至7月南加利福尼亚洋流输送的过渡水质量以及8月至1月受亚热带地表水影响的影响。当上升指数最高时，从3月到6月，营养物浓度增加（硝酸盐高达16μM）。同样，叶绿素-a的年际变化显示了六个月的模式，在六月发现的平均月浓度最高（根据卫星，原位为5 mg m〜（-3）或8 mg m〜（-3）信息），最低的是12月至1月。在泻湖中还发现了一个空间分区，其内部区域较浅，而较深的闭口区域更绿，叶绿素-a丰富。在巴伊亚-马格达莱纳泻湖中，时空划分为两个区域和两个季节，年复一年地重复，只有很小的差异。根据南加州地区的上升趋势，在外围地区的第一学期，2006和2007年较冷，营养丰富，而2010年较暖。因此，在表现出主要海洋影响的沿海泻湖中，巴伊亚-马格达莱纳的沿海系统对应于亚热带沿海泻湖的一种异常类型，其养分输入主要是由于上升现象。

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