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Wang, F. J.; Chen, Y.; Guo, Z. G.; Gao, H. W.; Mackey, K. R.; Yao, X. H.; Zhuang, G. S.; Paytan, A.
Geophysical research letters, 16 March 2017, Letnik: 44, Številka: 5Journal Article
Atmospheric deposition can provide nutrients and potential toxicants to marine ecosystem, hence affecting ocean net primary productivity (NPP). Nonetheless, the interactive effects of mixed aerosol components on phytoplankton have rarely been reported. Here we explored the combined effects of iron (Fe) and copper (Cu) on NPP over the East China Sea. In aerosol addition mesocosm experiments, phytoplankton growth was suppressed under high aerosol Cu but was increased when high Cu was accompanied by high Fe in aerosols. A time series of soluble aerosol Fe and Cu deposition was obtained and compared to regional chlorophyll a (Chl a) abundances from Moderate Resolution Imaging Spectroradiometer/Aqua. Strong positive correlations were observed between the dry flux ratios of soluble Fe/Cu and Chl a abundances in the large offshore area, whereas these variables were uncoupled in coastal regions where riverine input and upwelling dominated the biogeochemistry. Current work provides insight into the complex linkage between atmospheric deposition and marine productivity. Key Points Chlorophyll a concentrations are highly correlated with dry deposition flux ratios of soluble Fe/Cu The toxicity of aerosol Cu to phytoplankton could be alleviated by high Fe in the aerosol More frequent dust events may increase Fe/Cu flux ratio and contribute to the higher primary productivity in spring
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