Large-scale variations in the stoichiometry of marine organic matter respiration
Large-scale variations in the stoichiometry of marine organic matter respiration
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DOI：
10.1038/ngeo2300
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发表时间：
2014-12-01
影响因子：
18.3
通讯作者：
Deutsch, Curtis
中科院分区：
文献类型：
--
作者：
DeVries, Tim;Deutsch, Curtis
海洋有机物的元素组成决定着浮游生物之间的资源竞争，并耦合了碳、营养物和氧的全球循环。观测表明，浮游植物从表层沃茨中清除的这些基本元素的比例存在系统性的大规模变化（1-5）。然而，尚未发现这种变化对深海特性的影响。在这里，我们使用一个数据约束的海洋环流模型和观察到的溶解氧和营养磷酸盐的长期平均分布表明，有一个三倍的变化，在不同纬度的溶解氧消耗量每单位的磷酸盐释放有机物呼吸。这种模式的矿化率显着修改的程度和分布的低氧水团在内部海洋。我们还发现，具有不同的光和营养物质的可用性的海洋生物群落的特点是不同的区域化学计量。这些发现表明，在一个更加分层的海洋中，光照的增加和营养盐浓度的降低可以提高浮游植物的C：P比，以及海洋生物泵的相关碳储存。
The elemental composition of marine organic matter governs resource competition among plankton, and couples the global cycles of carbon, nutrients and oxygen. Observations have revealed systematic large-scale variation in the ratios of these essential elements removed from surface waters by phytoplankton(1-5). However, an impact of this variability on deep ocean properties has not been detected. Here we use a data-constrained ocean circulation model and observed long-term mean distributions of dissolved oxygen and the nutrient phosphate to show that there is a threefold variation across latitudes in the amount of dissolved oxygen consumed per unit of phosphate released during organic matter respiration. This pattern of remineralization ratios is shown to significantly modify the extent and distribution of low-oxygen water masses in the interior ocean. We also find that ocean biomes with distinct light and nutrient availability are characterized by different regional stoichiometries. These findings suggest that in a more stratified ocean, an increase in light exposure and decrease in nutrient concentration could raise the C:P ratio of phytoplankton, and the associated carbon storage by the ocean's biological pump.