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Nutrients in Atmospheric Wet Deposition in the East China Sea

ZHU Yu-mei,LIU Su-mei(Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China)  
92 rainwater samples were collected at Shengsi Archipelago from January 2008 to December 2009.The pH and the concentrations of nutrients(NH+4,NO-3+ NO-2,PO3-4,SiO2-3) were analyzed using spectrophotometry to understand the impacts of the atmospheric wet deposition on the ecosystem of the East China Sea.The results showed that the pH of 85% samples were less than 5.0,and had significant effect on the environment.There were significant differences among monthly average concentrations of nutrients and rainfall and seasonal average wet deposition of nutrients in investigation periods.The annual average wet deposition flux was 52.05 mmol·(m2·a)-1 for DIN,0.08 mmol·(m2·a)-1 for PO3-4,2.05 mmol·(m2·a)-1 for SiO2-3.The average molar ratios of NO-3/NH+4 is 0.73,N∶P ratio is 684∶1,indicating that nutrients composition in rainwater was different from seawater of the East China Sea Shelf(10-150).The wet deposition may change the nutrients structure,pH and lead to change the phytoplankton production in the surface seawater of the East China Sea,even lead to the red tide.
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