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Distribution and cycling of terrigenous dissolved organic matter in the ocean

机译:海洋中陆源溶解性有机物的分布和循环

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摘要

Terrigenous dissolved organic matter (DOM) is continuously discharged by rivers into the ocean, yet its distribution and reactivity within ocean basins remain poorly defined aspects of the global carbon cycle. Direct evidence for the presence of terrigenous DOM in the open ocean has been found only in dissolved humic substances isolated from surface waters of the eastern equatorial Pacific Ocean. Here we report the detection of low concentrations of lignin—a biopolymer found only in terrestrial vegetation—in DOM collected from the Pacific and Atlantic oceans, indicating that terrigenous DOM is distributed throughout the ocean water column. Higher lignin concentrations in Atlantic waters, relative to Pacific waters, reflect terrigenous DOM concentrations that are 2.6 times higher in the Atlantic. This finding is consistent with the 3.6-times greater riverine water-discharge to the Atlantic Ocean, and with known patterns of ocean circulation. It appears that terrigenous DOM comprises only a small fraction (0.7-2.4%) of the total DOM in the ocean, and that its oceanic residence time (21-132yr) is much shorter 1 than that of marine DOM. The regeneration of nutrients during rapid cycling of terrigenous DOM could contribute to high rates of primary production in the coastal ocean.
机译:陆源溶解性有机物(DOM)不断被河流排放到海洋中,但是其在海洋盆地内的分布和反应性仍然是全球碳循环中定义不清的方面。仅在从赤道东太平洋表层水中分离出的溶解腐殖质中发现了陆源DOM存在的直接证据。在这里,我们报告了在从太平洋和大西洋收集的DOM中检测到低浓度的木质素(仅在陆地植被中发现的一种生物聚合物)的情况,这表明陆源DOM分布在整个海洋水域中。相对于太平洋水域,大西洋水域中较高的木质素浓度反映出陆源性DOM浓度是大西洋中的2.6倍。这一发现与向大西洋的河水排放量增加了3.6倍以及已知的海洋环流模式相吻合。似乎陆源DOM仅占海洋中总DOM的一小部分(0.7-2.4%),并且其海洋停留时间(21-132yr)比海洋DOM短1。陆生DOM快速循环过程中养分的再生可能有助于沿海海洋的高初级生产力。

著录项

  • 来源
    《Nature》 |1997年第6624期|p.480-482|共3页
  • 作者

    Stephen Opsahl; Ronald Benner;

  • 作者单位
  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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