The Role of External Inputs and Internal Cycling in Shaping the Global Ocean Cobalt Distribution: Insights From the First Cobalt Biogeochemical Model
The Role of External Inputs and Internal Cycling in Shaping the Global Ocean Cobalt Distribution: Insights From the First Cobalt Biogeochemical Model
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外部输入和内部循环在塑造全球海洋钴分布中的作用：来自第一个钴生物地球化学模型的见解
DOI：
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发表时间：
2018
影响因子：
5.2
通讯作者：
M. Saito
中科院分区：
文献类型：
--
作者：
A. Tagliabue;N. Hawco;R. Bundy;W. Landing;A. Milne;P. Morton;M. Saito
钴是海洋微生物的重要微量营养素，因为它存在于维生素B12中，并且是催化细胞过程的各种金属酶的辅因子。此外，当将海水中钴的可用性与生物需求进行比较时，钴在海水中被耗尽，这表明钴具有潜在的重要限制作用。为了正确解释钴的潜在生物学作用，因此需要了解驱动钴的地球化学循环的过程，特别是外部输入和内部循环之间的平衡。为此，我们在最先进的三维全球海洋地球化学模型中开发了第一个钴模型。总体而言，我们的模型在再现测量方面做得很好，表面相关系数>0.7，深度相关系数>0.5。我们发现，大陆边缘是钴的主要来源，在低底层水氧条件下的供应发挥了至关重要的作用。锰氧化细菌的活性在低氧和低温下受到抑制，从而延长了钴的停留时间，从而促进了边缘钴的盆地规模分布。总体而言，我们发现在250米以上和全球海洋中的停留时间分别为7年和250年。重要的是，我们发现，占主导地位的内部再补给过程从颗粒钴的再生和再循环切换到上层海洋和海洋内部之间的清除钴的溶解。我们的模型突出了海洋中生物活动可能对钴的可用性最敏感的关键区域。
Cobalt is an important micronutrient for ocean microbes as it is present in vitamin B12 and is a co‐factor in various metalloenzymes that catalyze cellular processes. Moreover, when seawater availability of cobalt is compared to biological demands, cobalt emerges as being depleted in seawater, pointing to a potentially important limiting role. To properly account for the potential biological role for cobalt, there is therefore a need to understand the processes driving the biogeochemical cycling of cobalt and, in particular, the balance between external inputs and internal cycling. To do so, we developed the first cobalt model within a state‐of‐the‐art three‐dimensional global ocean biogeochemical model. Overall, our model does a good job in reproducing measurements with a correlation coefficient of >0.7 in the surface and >0.5 at depth. We find that continental margins are the dominant source of cobalt, with a crucial role played by supply under low bottom‐water oxygen conditions. The basin‐scale distribution of cobalt supplied from margins is facilitated by the activity of manganese‐oxidizing bacteria being suppressed under low oxygen and low temperatures, which extends the residence time of cobalt. Overall, we find a residence time of 7 and 250 years in the upper 250 m and global ocean, respectively. Importantly, we find that the dominant internal resupply process switches from regeneration and recycling of particulate cobalt to dissolution of scavenged cobalt between the upper ocean and the ocean interior. Our model highlights key regions of the ocean where biological activity may be most sensitive to cobalt availability.
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影响因子：
64.8
作者：
Browning, Thomas J.;Achterberg, Eric P.;Moore, C. Mark
通讯作者：
Moore, C. Mark
影响因子：
4.9
作者：
A. Noble;D. Ohnemus;N. Hawco;P. Lam;M. Saito
通讯作者：
A. Noble;D. Ohnemus;N. Hawco;P. Lam;M. Saito
钴和海洋氧化还原演化
影响因子：
5.3
作者：
Swanner;Planavsky;Lalonde;Robbins;Bekker;Rouxel;Kappler;Mojzsis;Konhauser
通讯作者：
Konhauser
中深海中的钴清除及其对全球质量平衡的影响：合成水柱和沉积通量
影响因子：
3
作者：
Hawco, Nicholas J.;Lam, Phoebe J.;Lee, Jong-Mi;Ohnemus, Daniel C.;Noble, Abigail E.;Wyatt, Neil J.;Lohan, Maeve C.;Saito, Mak A.
通讯作者：
Saito, Mak A.
影响因子：
5.2
作者：
R. Shelley;P. Sedwick;T. Bibby;Patricia Cabedo-Sanz;T. Church;Rodney J. Johnson;Anna I. Macey;C. Marsay;E. Sholkovitz;S. Ussher;P. Worsfold;M. Lohan
通讯作者：
R. Shelley;P. Sedwick;T. Bibby;Patricia Cabedo-Sanz;T. Church;Rodney J. Johnson;Anna I. Macey;C. Marsay;E. Sholkovitz;S. Ussher;P. Worsfold;M. Lohan