Cadmium regeneration within the North Atlantic
Cadmium regeneration within the North Atlantic
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北大西洋的镉再生
DOI：
10.1002/2015gb005215
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发表时间：
2015
影响因子：
5.2
通讯作者：
Jingfeng Wu
中科院分区：
文献类型：
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作者：
S. Roshan;Jingfeng Wu
底栖生物微化石中的镉（Cd）已被广泛用于重建北大西洋过去的水循环。这需要对北大西洋海水镉的分布进行保守混合而非再生过程的主要控制。通过将最近报道的300米以下深度的Cd数据与GA03样带的定量水质量分析相结合，我们测试了北大西洋镉循环的两种模型：单独的保守混合和保守混合加再生，称为再生混合。结果表明，再生混合模型对观测值的再现性（斜率= 0.99,R2 = 0.97）明显优于保守混合模型（斜率= 0.99,R2 = 0.88）。应用再生混合模型估算北大西洋“内部”再生的溶解镉的数量。该区域再生镉分别占北大西洋深度> ~ 1000m和300 ~ 1000m镉总量的~10%和bbb50 %，表明微化石重建海水镉可归因于南大西洋与北大西洋的混合，在1000 m以下深度具有较高的精度，而在300 ~ 1000m范围内镉更多地受再生过程的控制，而不是混合过程。将微化石重建的海水Cd归因为300-1000 m深度范围内水体几何形状的变化。从再生混合模型中得到Cd/PO43−再生比为262 pM/µmol/kg的区域和垂直恒定值，与北大西洋最近的研究结果相当。
Cadmium (Cd) incorporated into the benthic microfossils has been widely used in reconstructing the past water circulation in the North Atlantic. This requires a major control by conservative mixing over regeneration process on the seawater cadmium distribution in the North Atlantic. Through coupling the recently reported Cd data at depths below 300 m with quantitative water mass analysis along the GA03 transect, we tested two models for cadmium cycling within the North Atlantic: conservative mixing alone and conservative mixing plus regeneration which is termed as regenerative mixing. The results show that the regenerative mixing model reproduces the observations (slope = 0.99 and R2 = 0.97) much better than the conservative mixing model (slope = 0.99 and R2 = 0.88). The regenerative mixing model was applied to estimate the amount of dissolved cadmium regenerated “within” the North Atlantic. This regionally regenerated cadmium contributes to ~10% and >50% of the total cadmium in the North Atlantic at depths >1000 m and 300–1000 m, respectively, indicating that the microfossil‐reconstructed seawater Cd can be attributed to the mixing from the South Atlantic to the North Atlantic with high accuracy for depths below 1000 m, while within 300–1000 m cadmium is more controlled by the regeneration process than the mixing process, complicating the attribution of the microfossil‐reconstructed seawater Cd to the changes in water mass geometry within this 300–1000 m depth range. A regionally and vertically constant Cd/PO43− regeneration ratio ~262 pM/µmol/kg was derived from the regenerative mixing model which is comparable with ratios estimated in the recent studies for the North Atlantic.