A heat-induced molecular signature in marine dissolved organic matter
A heat-induced molecular signature in marine dissolved organic matter
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DOI：
10.1038/ngeo440
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发表时间：
2009-03-01
影响因子：
18.3
通讯作者：
Paeng, Jiyoung
中科院分区：
文献类型：
--
作者：
Dittmar, Thorsten;Paeng, Jiyoung
大部分海水是无机盐和气体的水溶液。然而，如果只是这样，我们所知道的生命就不会存在。除了这种无机成分外，每升海水中至少有数万个有机分子--统称为溶解有机物--以皮摩尔量存在。溶解的有机物质对水生食物网很重要，其碳含量大致相当于陆地和海洋中所有生物群的总和。然而，人们对海洋中溶解的有机物的循环还没有很好的了解。分析化学的最新进展使得能够在分子水平上对溶解有机物进行前所未有的详细表征，揭示出有相当大一部分已经发生了热变化，无论是在深层沉积物中，还是通过在陆地上燃烧然后输送到海洋中。热蚀变至少部分解释了海洋溶解有机质对微生物分解的抵抗力。
The bulk of sea water is an aqueous solution of inorganic salts and gases. However, if it was just this, life as we know it would not exist. In addition to this inorganic component, at least tens of thousands of organic molecules - collectively known as dissolved organic matter - exist in picomole amounts in each litre of sea water. Dissolved organic matter is important for aquatic food webs and, integrated over the entire volume of the world's oceans, contains roughly as much carbon as all living biota on land and in the ocean combined. Yet, the cycling of dissolved organic matter in the ocean is not well understood. Recent progress in analytical chemistry has allowed the characterization of dissolved organic matter at the molecular level in unprecedented detail, revealing that a significant proportion has been thermally altered, either in deep sediments or through combustion on land with later delivery to the sea. Thermal alteration may explain, at least in part, the resistance of oceanic dissolved organic matter to microbial decomposition.