Concentrations and distribution of biogenic barium in surface sediments of Prydz Bay,Antarctica

查看全文 作　　者：TAN [1,2]Saizhang;YU [1,2]Peisong;HU [1,2]Chuanyu;HAN [1,2]Zhengbing;ZHANG [1,2]Haisheng

机构地区：[1]Laboratory of Marine Ecosystem and Biogeochemistry,State Oceanic Administration(SOA);[2]Second Institute of Oceanography,SOA

出　　处：《Advances in Polar Science》索引2013年第24卷第3期,共5页

基　　金：supported by the National Natural Science Foundation of China(Grant nos.41006118 and 41076134);the Chinese Polar Environment Comprehensive Investigation & Assessment Programmes(Grant no.CHINARE2012-04-04) 摘　　要：Concentrations of biogenic barium were investigated in surface sediments of Prydz Bay,Antarctica,during the 21st and27th CHINARE cruises.Factors controlling the observed distribution are explored.Biogenic barium concentrations obtained from a sequential extraction procedure are compared with total concentrations obtained from the normative calculation based on a total digestion,and differences in the results are examined.Concentrations of biogenic barium,calculated by the normative calculation,were much higher than the concentrations obtained through sequential extraction;this discrepancy is the result of the occurrence of barium associated with Mn/Fe oxides,which represents an important component of total barium in these sediments.Concentrations of biogenic barium obtained from the sequential extraction range from 104 to 445μg·g^(-1),and the average concentration was227μg·g^(-1).The highest concentrations of biogenic barium occur in the central area of the bay,where the seawater is more stable,while lower values occur in the bank and the ice shelf.Biogenic barium is significantly linearly correlated with biogenic barium and organic carbon,and similar in distribution of Chl a,which may indicate that primary productivity of phytoplankton in the surface water column is the main environmental factor regulating barium concentration and distribution. 关键词：南极普里兹湾沉积物分布表层沉积物总浓度生物连续提取方法钡初级生产力

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Concentrations and distribution of biogenic barium in surface sediments of Prydz Bay,Antarctica

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