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首页> 外文期刊>Marine Chemistry >Possible impacts of volcanic ash emissions of Mount Etna on the primary productivity in the oligotrophic Mediterranean Sea: Results from nutrient-release experiments in seawater
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Possible impacts of volcanic ash emissions of Mount Etna on the primary productivity in the oligotrophic Mediterranean Sea: Results from nutrient-release experiments in seawater

机译：埃特纳火山的火山灰排放对贫营养地中海地区初级生产力的可能影响：海水中养分释放实验的结果

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摘要

Atmospheric deposition of volcanic ash has recently been recognized as an important nutrient source into the surface ocean. Mount Etna (Italy), one of the world's most active volcanoes, is located in the oligotrophic Mediterranean Sea (MedSea). Despite the active volcanism on Mount Etna, the biogeochemical impacts of volcanic ash fallouts on the marine primary productivity (MPP) remain largely unknown. Here we present the results of seawater nutrient release experiments with volcanic ash samples from Mount Etna that have been collected during different eruptive episodes between 2001 and 2007. Our results show that volcanic ash from Mount Etna releases significant amounts of fixed-N (35-855 nmol/g), P (7-970 nmol/g), Si (3-2060 nmol/g),Fe(10-130 nmol/g)and Zn (＜21 nmol/g). We further estimated an example representative of ash-fall from Etna based on the case-study focusing on 4-5 November 2002 activity, by using the general relation between the thicknesses of the ash deposits and the ash depositional areas. Etna explosive eruptions can transport volcanic ash as far as 800 km, with ash emissions exceeding the particle flux during dust storm events (of 10 g/m~2 input) as far as 400 km downwind from the volcano. Our results emphasize that Etna ash can provide a significant supply of nutrients, which can favor the MPP in the central MedSea.
机译：火山灰的大气沉积最近被认为是进入表层海洋的重要养分来源。埃特纳火山（意大利）是世界上最活跃的火山之一，位于贫营养化的地中海（MedSea）中。尽管埃特纳火山火山活动活跃，但火山灰沉积物对海洋初级生产力（MPP）的生物地球化学影响仍然未知。在这里，我们介绍了2001年至2007年期间在不同爆发事件中采集的埃特纳火山火山灰样本海水养分释放实验的结果。我们的结果表明，埃特纳火山火山灰释放了大量的固定氮（35-855 P（7-970 nmol / g），Si（3-2060 nmol / g），Fe（10-130 nmol / g）和Zn（＜21 nmol / g）。我们通过重点研究2002年11月4日至5日活动的案例研究，通过使用灰烬沉积物厚度与灰烬沉积区域之间的一般关系，进一步估算了一个代表埃特纳火山灰沉降的实例。埃特纳火山爆发性火山爆发可将火山灰运送至800公里，在沙尘暴事件期间（输入量为10 g / m〜2），火山灰排放量超过了火山下风400公里。我们的结果强调，埃特纳火山灰可以提供大量营养，这可能有利于MedSea中部的MPP。

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  • 来源
    《Marine Chemistry》 |2013年第20期|32-42|共11页
  • 作者

    Nazli Olgun; Svend Duggen; Daniele Andronico; Steffen Kutterolf; Peter Leslie Croot; Salvatore Giammanco; Paolo Censi; Loredana Randazzo;

  • 作者单位

    Dynamics of the Ocean Floor Division, Helmholtz-Center for Ocean Research, GEOMAR, Kiel, Germany,Marine Biogeochemistry Division, Helmholtz-Center for Ocean Research, GEOMAR, Kiel, Germany;

    Dynamics of the Ocean Floor Division, Helmholtz-Center for Ocean Research, GEOMAR, Kiel, Germany,A. P. Moller Skolen Upper Secondary School and Sixth Form College of the Danish National Minority in Germany, Schleswig, Germany;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Osservatorio Etneo, Piazza Roma 2, Catania 95123, Italy;

    Dynamics of the Ocean Floor Division, Helmholtz-Center for Ocean Research, GEOMAR, Kiel, Germany;

    Marine Biogeochemistry Division, Helmholtz-Center for Ocean Research, GEOMAR, Kiel, Germany,Earth and Ocean Sciences Department, National University of Ireland, Galway, Ireland;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Osservatorio Etneo, Piazza Roma 2, Catania 95123, Italy;

    Dipartimento di Scienze delta Terra e del Mare (DiSTeM), Universita di Palermo, Via Archirafi, 36 90123 Palermo, Italy;

    Dipartimento di Scienze delta Terra e del Mare (DiSTeM), Universita di Palermo, Via Archirafi, 36 90123 Palermo, Italy;

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  • 正文语种 eng
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  • 关键词

    Oceanic fertilization; Volcanic ash; Mount Etna; Mediterranean Sea; Phosphate; Nitrate; Iron;

    机译：海洋施肥;火山灰;埃特纳火山;地中海;磷酸盐;硝酸盐铁;

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