Effect of iron enrichment on the dynamics of transparent exopolymer particles in the western subarctic Pacific
Effect of iron enrichment on the dynamics of transparent exopolymer particles in the western subarctic Pacific
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DOI：
10.1016/j.pocean.2005.02.012
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发表时间：
2005-02
影响因子：
4.1
通讯作者：
N. Ramaiah;S. Takeda;K. Furuya;T. Yoshimura;J. Nishioka;T. Aono;Y. Nojiri;K. Imai;I. Kudo;H. Saito;A. Tsuda
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文献类型：
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作者：
N. Ramaiah;S. Takeda;K. Furuya;T. Yoshimura;J. Nishioka;T. Aono;Y. Nojiri;K. Imai;I. Kudo;H. Saito;A. Tsuda
2001年7 - 8月在西亚北极太平洋进行的首次原位铁富集实验中，研究了透明外聚合物颗粒（TEP）的动力学，目的是评估TEP对开放海洋生态系统铁富集后初级生产力增加的垂直通量的贡献。在5 ~ 70 m的6个深度上，分别在富营养化斑块内外各设一个站位，观测了表层TEP、叶绿素a（Chl a）和颗粒有机碳（POC）的垂直分布。TEP和总质量通量估计从200米深的浮动沉积物陷阱部署。斑块外的Chl a和TEP浓度分别为0.2 - 1.9μgL-1和40-60μ gXG当量L-1。在斑块内，Chl a从第7天开始急剧增加，在第13天达到峰值19.2μgL− 1，这与TEP峰值189μgXGequiv.L−1相吻合。沉积物捕集器中的TEP通量从41增加到88mgXGequiv.m-2d-1，TEP对总质量通量的贡献为8-14%。这形成了关于西亚北极太平洋环境中TEP浓度的基本数据集，并评估了铁富集对TEP的影响。
Dynamics of transparent exopolymer particles (TEP) was studied during the first in situ iron-enrichment experiment conducted in the western subarctic Pacific in July–August 2001, with the goal of evaluating the contribution of TEP to vertical flux as a result of increased primary production following iron enrichment in open ocean ecosystems. Subsequent to the enhancement of phytoplankton production, we observed increase in TEP concentration in the surface layer and sedimentation of organic matter beneath it. Vertical profiles of TEP, chlorophyll a (Chl a) and particulate organic carbon (POC) were obtained from six depths between 5 and 70m, from a station each located inside and outside the enriched patch. TEP and total mass flux were estimated from the floating sediment traps deployed at 200m depth. Chl a and TEP concentrations outside the patch varied from 0.2 to 1.9μgL−1and 40–60μgXGequiv.L−1, respectively. Inside the patch, Chl a increased drastically from day 7 reaching the peak of 19.2μgL−1on day 13, which coincided with the TEP peak of 189μgXGequiv.L−1. TEP flux in the sediment trap increased from 41 to 88mgXGequiv.m−2d−1, with 8–14% contribution of TEP to total mass flux. This forms the basic data set on ambient concentrations of TEP in the western subarctic Pacific, and evaluation of the effect of iron enrichment on TEP.