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首页> 外文期刊>Estuarine Coastal and Shelf Science >Intra-annual upwelling patterns and its linkage with primary production in the euphotic zone (24.5 degrees N) of Southern Baja California coast
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Intra-annual upwelling patterns and its linkage with primary production in the euphotic zone (24.5 degrees N) of Southern Baja California coast

机译：南下加利福尼亚州沿海常绿区（北纬24.5度）的年内上升趋势及其与初级生产的联系

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摘要

The continental shelf of Southern Baja California has been scarcely researched south of 25 degrees N despite it being oceanographically necessary to gain a better understanding of the north-eastern Pacific transitional zone between middle and tropical latitudes. Therefore, the intra-annual patterns of the upwelling cycle and primary production were studied in a monitoring station (24.5 degrees N, 112.1 degrees W; 85 m depth) from August 2008 to December 2011. Monthly, thermohaline vertical profiles were recorded and seawater sampled at 100, 33, 10, 3 and 1% irradiance depth levels. Dissolved oxygen, nutrients and chlorophyll-a concentrations and net primary production (NPP, remote sensed and in situ) were determined. Two half-yearly recurrent periods (P < 0.001) were observed: an intense (cold) period from February to July and a faint (warm) period from August to January. In the euphotic layer, nitrate concentrations were inversely related to temperature, showing their dependence on upwelling. NPP was directly related to the upwelling process, with an annual average of 1.21 +/- 0.81 gC gC m(-2) d(-1) in the triennium 2009-2011. Although the influence of La-Ni<(n)over tilde>a event was observed during the warm period of 2010 and the cold period of 2011, this change did not significantly affect NPP (P < 0.05). (C) 2015 Elsevier Ltd. All rights reserved.
机译：尽管在海洋学上有必要更好地了解中纬度和热带纬度之间的东北太平洋过渡带，但南下加利福尼亚州的大陆架很少在北纬25度以南进行过研究。因此，从2008年8月至2011年12月，在一个监测站（北纬24.5度，北纬112.1度；水深85 m）中研究了上升周期和一次生产的年内格局。记录了每月的盐卤垂直剖面，并对海水进行了采样在100％，33％，10％，3％和1％的照射深度水平下。确定了溶解氧，养分和叶绿素-a的浓度以及净初级生产力（NPP，遥感和就地）。观察到两个半年一次的复发期（P <0.001）：从2月到7月的密集（冷）期和从8月到1月的微弱（温暖）期。在常光层中，硝酸盐浓度与温度成反比，表明它们对上升流的依赖性。 NPP与上升过程直接相关，2009-2011三年期的年平均NPP为1.21 +/- 0.81 gC gC m（-2）d（-1）。尽管在2010年的温暖期和2011年的寒冷期观察到La-Ni <（n）对波浪的影响，但这一变化并没有显着影响NPP（P <0.05）。 （C）2015 Elsevier Ltd.保留所有权利。

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