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首页> 外文期刊>Estuarine Coastal and Shelf Science >Nutrient dynamics under different ocean acidification scenarios in a low nutrient low chlorophyll system: The Northwestern Mediterranean Sea
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Nutrient dynamics under different ocean acidification scenarios in a low nutrient low chlorophyll system: The Northwestern Mediterranean Sea

机译：低营养低叶绿素系统中不同海洋酸化情景下的营养动态：地中海西北部

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Two pelagic mesocosm experiments were conducted to study the impact of ocean acidification on Mediterranean plankton communities. A first experiment took place in summer 2012 in the Bay of Calvi (France) followed by an experiment in winter 2013 in the Bay of Villefranche (France) under pre-bloom conditions. Nine mesocosms were deployed: three served as controls and six were acidified in a targeted partial pressure of CO2 (pCO(2)) gradient from 450 to 1250 mu atm. The evolution of dissolved organic and inorganic nutrient concentrations was observed using nanomolar techniques. The experiments were characterized by a large contribution of organic nutrients to nutrient pools and contrasting in situ conditions with an inorganic N/P ratio of 1.7 in summer and of 117 in winter. In the Bay of Calvi, initial conditions were representative of the summer oligotrophic Mediterranean Sea. While inorganic phosphate concentrations were depleted during both experiments, in situ inorganic nitrogen concentrations were higher in winter. However, nitrate was rapidly consumed in winter in all mesocosms during the acidification phase, leading to a decrease in N/P ratio to 13. During these first mesocosm experiments conducted in a low nutrient low chlorophyll area, nutrient dynamics were insensitive to CO2 enrichment, indicating that nutrient speciation and related biological processes were likely not impacted. During both experiments, nitrate and phosphate dynamics were controlled by the activity of small species that are favored in low nutrient conditions. In contrast to the theoretical knowledge, no increase in iron solubility at high pCO(2) was observed. (C) 2016 Elsevier Ltd. All rights reserved.
机译：进行了两个上层中观试验，以研究海洋酸化对地中海浮游生物群落的影响。 2012年夏季在法国卡尔维湾进行了第一个实验，随后在2013年冬季在法国布卢弗前的条件下在Villefranche湾进行了实验。部署了九个中观世界：三个作为对照，六个在目标二氧化碳分压（pCO（2））梯度为450至1250μatm的条件下酸化。使用纳摩尔技术观察到溶解的有机和无机营养物浓度的变化。实验的特点是有机养分对养分池的贡献很大，并且在原地条件下形成对比，夏季的无机氮/磷比为1.7，冬季为117。在卡尔维湾，初始条件是夏季贫营养性地中海的代表。虽然在两个实验中都消耗了无机磷酸盐，但冬季原位无机氮的浓度较高。但是，在酸化阶段，冬季所有中膜的硝酸盐都被迅速消耗，导致N / P比降低到13。在低营养低叶绿素区域进行的第一个中膜实验中，营养动力学对CO2富集不敏感，表明养分形态和相关的生物过程可能不会受到影响。在两个实验中，硝酸盐和磷酸盐的动力学受低养分条件下有利的小物种活动的控制。与理论知识相反，在高pCO（2）下未观察到铁溶解度的增加。 （C）2016 Elsevier Ltd.保留所有权利。

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