Dissolved zinc in the subarctic North Pacific and Bering Sea: Its distribution, speciation, and importance to primary producers
Dissolved zinc in the subarctic North Pacific and Bering Sea: Its distribution, speciation, and importance to primary producers
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DOI：
10.1029/2010gb004004
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发表时间：
2012-06
影响因子：
5.2
通讯作者：
R. Jakuba;M. Saito;J. Moffett;Yan Xu
中科院分区：
文献类型：
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作者：
R. Jakuba;M. Saito;J. Moffett;Yan Xu
北太平洋亚北极东部是一个高营养物和低叶绿素的地区，已经对铁控制初级生产的潜力进行了研究。锌是硅藻的一种重要微量营养素，其地球化学特征却不太明显。在横跨亚北极北太平洋和横跨白令海的横断面近地表水域中测量了总锌浓度和锌物种形成。近地表总溶解锌浓度在0.10 ~ 1.15 nmol L−1之间，北太平洋东部和白令海的浓度最低。溶解锌的形态以与强有机配体的络合为主，配体的浓度为1.1 ~ 3.6 nmol L−1，条件稳定常数（K ' znl /Zn '）为109.3 ~ 1011.0。通过与浮游植物色素浓度的比较和在船上进行孵育，评估了锌对初级生产者的重要性。锌浓度与硅藻特有的两种色素呈正相关。在北太平洋的一个站点，添加0.75 nmol L−1锌，4天后叶绿素增加了一倍。
The eastern subarctic North Pacific, an area of high nutrients and low chlorophyll, has been studied with respect to the potential for iron to control primary production. The geochemistry of zinc, a critical micronutrient for diatoms, is less well characterized. Total zinc concentrations and zinc speciation were measured in near‐surface waters on transects across the subarctic North Pacific and across the Bering Sea. Total dissolved zinc concentrations in the near‐surface ranged from 0.10 nmol L−1 to 1.15 nmol L−1 with lowest concentrations in the eastern portions of both the North Pacific and Bering Sea. Dissolved zinc speciation was dominated by complexation to strong organic ligands whose concentration ranged from 1.1 to 3.6 nmol L−1 with conditional stability constants (K′ZnL/Zn′) ranging from 109.3 to 1011.0. The importance of zinc to primary producers was evaluated by comparison to phytoplankton pigment concentrations and by performing a shipboard incubation. Zinc concentrations were positively correlated with two pigments that are characteristic of diatoms. At one station in the North Pacific, the addition of 0.75 nmol L−1 zinc resulted in a doubling of chlorophyll after 4 days.