Latitudinal change of remineralization ratios in the oceans and its implication for nutrient cycles
Latitudinal change of remineralization ratios in the oceans and its implication for nutrient cycles
复制标题
海洋再矿化率的纬度变化及其对营养循环的影响
DOI：
10.1029/2001gb001828
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发表时间：
2002
影响因子：
5.2
通讯作者：
T. Peng
中科院分区：
文献类型：
--
作者：
Yuan;T. Peng
引入了一种新的三端元混合模型，以获得有机物在水柱中的再矿化率。从北方大西洋到南大洋，再到赤道印度洋和北方太平洋，深水柱中有机质的再矿化率（P/N/Corg/−O2）或多或少地沿着全球大洋深水环流路线发生系统性变化。北方大西洋有机质的平均矿化率为P/N/Corg/−O2 = 1/（16 ± 1）/（73 ± 8）/（137 ± 7），而南大洋为P/N/Corg/−O2 = 1/（15 ± 1）/（80 ± 3）/（133 ± 5）。这些数值与传统的Redfield海洋浮游生物P/N/Corg/−O2 = 1/16/106/138的比值相似，只是Corg/P比值较低。赤道印度洋的平均同化率为P/N/Corg/−O2 = 1/（10 ± 1）/（94 ± 5）/（130 ± 7），北方太平洋的平均同化率为P/N/Corg/−O2 = 1/（13 ± 1）/（124 ± 11）/（162 ± 11）。两个海洋盆地的明显低N/P比表明，有机氮在整个含氧水柱中的低氧或还原有机物微环境中通过细菌的硝化/反硝化过程部分转化为气态N2 O和N2。矿化有机质的实际N/P比值可能在15 ± 1左右。矿化有机物的−O2/Corg比值也会沿着全球深海环流路线系统性地沿着降低，这表明生物分子（如脂质、蛋白质、核酸和碳水化合物）的相对比例发生了变化。在比较GEOSECS和WOCE数据集获得的结果时，没有发现矿化率的时间趋势。
A new three‐end‐member mixing model is introduced to obtain remineralization ratios of organic matter in the water column. Remineralization ratios (P/N/Corg/−O2) of organic matter in the deep water column change systematically from the northern Atlantic to the Southern Oceans, then to the equatorial Indian and the northern Pacific oceans, more or less along the global ocean circulation route of deep water. Average remineralization ratios of organic matter for the northern Atlantic Ocean are P/N/Corg/−O2 = 1/(16 ± 1)/(73 ± 8)/(137 ± 7), and for the Southern Oceans P/N/Corg/−O2 = 1/(15 ± 1)/(80 ± 3)/(133 ± 5). Those values are similar to the traditional Redfield ratios of P/N/Corg/−O2 = 1/16/106/138 for marine plankton, except for the low Corg/P ratio. Average remineralization ratios for the equatorial Indian Ocean are P/N/Corg/−O2 = 1/(10 ± 1)/(94 ± 5)/(130 ± 7), and for the northern Pacific Ocean P/N/Corg/−O2 = 1/(13 ± 1)/(124 ± 11)/(162 ± 11). The apparent low N/P ratio for both ocean basins suggests that organic nitrogen was converted partly into gaseous N2O and N2 by bacteria through nitrification/denitrification processes in a low‐oxygen or reducing microenvironment of organic matter throughout the oxygenated water column. The actual N/P ratio of remineralized organic matter is probably around 15 ± 1. The −O2/Corg ratio of remineralized organic matter also decreases systematically along the global ocean circulation route of deep water, indicating changes in relative proportions of biomolecules such as lipids, proteins, nucleic acids, and carbohydrates. No temporal trends of remineralization ratios are detected when comparing the results obtained by GEOSECS and WOCE data sets.