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首页> 外文期刊>Environmental Science & Technology >Enhanced Solubility and Ecological Impact of Atmospheric Phosphorus Deposition upon Extended Seawater Exposure
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Enhanced Solubility and Ecological Impact of Atmospheric Phosphorus Deposition upon Extended Seawater Exposure

机译：大气磷沉积对延长海水暴露的溶解度和生态影响

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摘要

Atmospheric P solubility affects the amount of P available for phytoplankton in the surface ocean, yet our understanding of the timing and extent of atmospheric P solubility is based on short-term leaching experiments where conditions may differ substantially from the surface ocean. We conducted longer- term dissolution experiments of atmospheric aerosols in filtered seawater, and found up to 9-fold greater dissolution of P after 72 h compared to instantaneous leaching. Samples rich in anthropogenic materials released dissolved inorganic P (DIP) faster than mineral dust. To gauge the effect of biota on the fate of atmospheric P, we conducted field incubations with aerosol samples collected in the Sargasso Sea and Red Sea. In the Sargasso Sea phytoplankton were not P limited, and biological activity enhanced DIP release from aerosols, and aerosols induced biological mineralization of dissolved organic P in seawater, leading to DIP accumulation. However, in the Red Sea where phytoplankton were colimited by P and N, soluble P was rapidly consumed by phytoplankton following aerosol enrichment. Our results suggest that atmospheric P dissolution could continue over multiple days once reaching the surface ocean, and that previous estimates of atmospheric P deposition may underestimate the contribution from this source.
机译：大气中P的溶解度会影响表层海洋浮游植物可利用的P量，但我们对大气P溶解度的时间和范围的理解是基于短期浸出实验，其中条件可能与表层海洋有很大不同。我们对过滤后的海水中的大气气溶胶进行了较长期的溶解实验，发现与瞬时浸出相比，P在72 h后的溶解度提高了9倍。富含人为物质的样品释放出的无机P（DIP）比矿物粉尘释放的快。为了评估生物群对大气中P命运的影响，我们与在Sargasso海和Red Sea中收集的气溶胶样品进行了现场孵育。在Sargasso海中，浮游植物不受磷的限制，生物活性增强了气溶胶中DIP的释放，并且气溶胶引起海水中溶解的有机P的生物矿化，导致DIP积累。但是，在浮游植物被磷和氮限制的红海中，气溶胶富集后浮游植物迅速消耗了可溶性磷。我们的研究结果表明，大气P的溶解一旦到达地表海洋，可能会持续数天，并且先前对大气P沉积的估计可能会低估这种来源的贡献。

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  • 来源
    《Environmental Science & Technology》 |2012年第19期|p.10438-10446|共9页
  • 作者

    Katherine R. M. Mackey; Kathryn Roberts; Michael W. Lomas; Mak A. Saito; Anton F. Post; Adina Paytan;

  • 作者单位

    Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, United States,Bay Paul Center for Comparative Molecular Biology and Evolution, Marine Biological Laboratory, Woods Hole, Massachusetts 02543, United States;

    Institute for Marine Science, University of California, Santa Cruz California 95064, United States;

    Bermuda Institute of Ocean Sciences, St. George's GE01, Bermuda;

    Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, United States;

    Bay Paul Center for Comparative Molecular Biology and Evolution, Marine Biological Laboratory, Woods Hole, Massachusetts 02543, United States;

    Bermuda Institute of Ocean Sciences, St. George's GE01, Bermuda;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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