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THE NUTRIENT GEOCHEMISTRY OF THE CARIACO BASIN

机译：加勒比盆地的营养地球化学

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摘要

The CARIACO Ocean Time Series program has made monthly measurements of oxygen, nutrients, and carbon system parameters (ΣCO_2, alkalinity, pH) in the Cariaco Basin since 1996. At the same time, sediment traps have collected settling particles at four to five depths ranging from 150 to 1,200 m. The depth of the transition from oxic to anoxic conditions has fluctuated dramatically over the time series due to changes in the occurrence of Caribbean water intrusions into the deep basin. Nutrient concentrations in the deep basin have increased steadily with time in a proportion reflective of the elemental ratios in the settling organic matter, although N:P ratios in the water column (approximately 16:1) differ from ratios in the accumulating nutrients (11:1) and the settling flux (ranging between 5:1 and 12.5:1). This difference is likely due to changes in the source material for remineralization, either because of sizeable ecosystem changes or changes in the relative importance of the terrestrial input of inorganic P or scavenging of P by mineral precipitation near the oxic/anoxic interface. Alternatively, there may have been changes in the degree of preferential remineralization of P.
机译：自1996年以来，CARIACO海洋时间序列计划每月对Cariaco盆地中的氧气，养分和碳系统参数（ΣCO_2，碱度，pH）进行测量。同时，沉积物捕集阱收集了四到五个深度范围内的沉降颗粒。从150至1,200 m由于加勒比水侵入深海盆地的发生变化，从有氧到无氧条件的转变深度在时间序列上发生了巨大波动。尽管水柱中的N：P比率（约16：1）与养分累积中的比率（11：1）不同，但深水盆地中的养分浓度随时间稳定增加，反映了沉降有机物的元素比率。 1）和稳定通量（介于5：1和12.5：1之间）。这种差异很可能是由于重新矿化的原料变化所致，或者是由于生态系统的巨大变化，或者是由于无机磷在地面输入的相对重要性的变化，或者是由于有氧/缺氧界面附近的矿物沉淀对磷的清除所致。或者，P的优先再矿化程度可能有所变化。

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  • 来源
    《Oceanography》 |2014年第1期|148-159|共12页
  • 作者

    MARY I. SCRANTON; CORDON T. TAYLOR; ROBERT THUNELL; CLAUDIA R. BENITEZ-NELSON; FRANK MULLER-KARGER; KENT FANNING; LAURA LORENZONI; ENRIQUE MONTES; RAMON VARELA; YRENE ASTOR;

  • 作者单位

    School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, USA;

    School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, USA;

    Department of Earth and Ocean Sciences and Marine Science Program, University of South Carolina, Columbia, SC, USA;

    Department of Earth and Ocean Sciences and Marine Science Program, University of South Carolina, Columbia, SC, USA;

    College of Marine Science, University of South Florida, St. Petersburg, FL, USA;

    College of Marine Science, University of South Florida, St. Petersburg, FL, USA;

    College of Marine Science, University of South Florida, St. Petersburg, FL, USA;

    College of Marine Science, University of South Florida, St. Petersburg, FL, USA;

    Fundacion La Salle de Ciencias Naturales, Estacion de Investigaciones Marinas de Margarita (EDIMAR), Punta de Piedras, Venezuela;

    Fundacion La Salle de Ciencias Naturales, EDIMAR, Punta de Piedras, Venezuela;

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