Variation in the seston C:N ratio of the Arctic Ocean and pan-Arctic shelves
Variation in the seston C:N ratio of the Arctic Ocean and pan-Arctic shelves
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DOI：
10.1016/j.jmarsys.2013.06.004
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发表时间：
2014-01-01
影响因子：
2.8
通讯作者：
Hessen, Dag O.
中科院分区：
文献类型：
--
作者：
Frigstad, Helene;Andersen, Tom;Hessen, Dag O.
通过研究3600多个颗粒有机碳（POC）和颗粒有机氮（PUN）的观测数据，我们评估了经典的Redfield C：N比（6.6）和最近提出的Sterner比（83）对北冰洋和泛北极大陆架的适用性。C：N的置信区间范围为6.43 - 8.82，而所有观察结果的平均C：N比为7.4。一般而言，Redfield或Sterner比率均不适用，Redfield比率过低，而Sterner比率过高。在区域的基础上，所有北方高纬度地区的C：N比显着高于Redfield比，除了北冰洋（6.6），楚科奇（6.4）和东西伯利亚（6.5）海。后两个区域受到营养丰富的太平洋沃茨的影响，并有很高比例的自养（即藻类衍生）材料。拉普捷夫海（7.9）和喀拉海（7.5）的C：N比值较高，陆源物质的贡献较大。最高的C：N比是在北部水（8.7）和东北部水（8.0）polynyas，这些地区更接近斯特纳比。C：N比率因区域而异，在巴伦支海受大西洋影响的区域（6.7）和受北极影响的区域（7.9）之间存在显著差异，而大西洋主导区域（挪威、格陵兰和大西洋巴伦支海）相似（6.7-7）。所有的观察相结合，大多数个别地区，显示出一种模式，降低C：N比增加悬浮物浓度。该荟萃分析对生态系统建模具有重要意义，因为它表明了C：N比的显著时空变异性，并挑战了恒定C：N比的常见假设。非恒定的化学计量被认为是由变量的贡献自养生物，异养生物和碎屑悬浮物，和显着减少的C：N比增加叶绿素a浓度支持这一观点。这项研究增加了使用幂函数模型的支持，其中指数是系统特定的，但我们建议一个一般的北极关系，其中POC = 7.4 PON0.89。(c)2013爱思唯尔有限公司版权所有。
Studying more than 3600 observations of particulate organic carbon (POC) and particulate organic nitrogen (PUN), we evaluate the applicability of the classic Redfield C:N ratio (6.6) and the recently proposed Sterner ratio (83) for the Arctic Ocean and pan-Arctic shelves. The confidence intervals for C:N ranged from 6.43 to 8.82, while the average C:N ratio for all observations was 7.4. In general, neither the Redfield or Sterner ratios were applicable, with the Redfield ratio being too low and the Sterner ratio too high. On a regional basis, all northern high latitude regions had a C:N ratio significantly higher than the Redfield ratio, except the Arctic Ocean (6.6), Chukchi (6.4) and East Siberian (6.5) Seas. The latter two regions were influenced by nutrient-rich Pacific waters, and had a high fraction of autotrophic (i.e. algal-derived) material. The C:N ratios of the Laptev (7.9) and Kara (7.5) Seas were high, and had larger contributions of terrigenous material. The highest C:N ratios were in the North Water (8.7) and Northeast Water (8.0) polynyas, and these regions were more similar to the Sterner ratio. The C:N ratio varied between regions, and was significantly different between the Atlantic (6.7) and Arctic (7.9) influenced regions of the Barents Sea, while the Atlantic dominated regions (Norwegian, Greenland and Atlantic Barents Seas) were similar (6.7-7). All observations combined, and most individual regions, showed a pattern of decreasing C:N ratios with increasing seston concentrations. This meta-analysis has important implications for ecosystem modelling, as it demonstrated the striking temporal and spatial variability in C:N ratios and challenges the common assumption of a constant C:N ratio. The non-constant stoichiometry was believed to be caused by variable contributions of autotrophs, heterotrophs and detritus to seston, and a significant decrease in C:N ratios with increasing Chlorophyll a concentrations supports this view. This study adds support to the use of a power function model, where the exponent is system-specific, but we suggest a general Arctic relationship, where POC = 7.4 PON0.89. (c) 2013 Elsevier B.V. All rights reserved.