北极东西伯利亚陆架表层沉积生物硅分布特征及环境意义  

Distribution characteristics and environmental significance of biogenic silica in the surface sediments of the Arctic East Siberian Shelf

作　　者：杨功旭 姚政权 冯晗 胡利民 Anatolii Astakhov[4] 邹建军 刘焱光 王昆山 Alexander Bosin Yuri Vasilenko 杨刚 石学法 YANG Cong-xu;YAO Zheng-quan;FENG Han;HU Li-min;ANATOLII Astahov;ZOU Jan-jun;LIU Yan-guang;ANG Kun-shan;ALEXANDER Bosin;YURI Vasienko;YANG Gang;SHI Xue-fa(Key Laboratory of Marine Geology and Mineralization,First Institute of Oceanography,Ministry of Natural Resources,Qingdao,Shandong 266061,China;Laboratory of Marine Geology,Laoshan Laboratory,Qingdao,Shandong 266237,China;Key Laboratory of Submarine Science and Exploration Technology of Ministry of Education,College of Marine Geosciences,Ocean University of China,Qingdao,Shandong266100,China;VIIl'icheu Pacific Institute of Oceanology,Far East Branch,Russian Academy of SciencesVladivostok 690041,Russia)

机构地区：[1]自然资源部第一海洋研究所,海洋地质与成矿作用重点实验室,山东青岛266061 [2]崂山实验室海洋地质过程与环境功能实验室,山东青岛266237 [3]中国海洋大学海洋地球科学学院,海底科学与探测技术教育部重点实验室,山东青岛266100 [4]俄罗斯科学院远东分院太平洋海洋研究所,符拉迪沃斯托克(海参崴)690041

出　　处：《矿物岩石地球化学通报》2023年第4期717-727,共11页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金重点支持项目(42130412)。

摘　　要：揭示北冰洋陆架区初级生产力变化及其控制因素,对评估北极在全球变化中的地位具有重要意义。本文对北极东西伯利亚陆架87个表层沉积生物硅进行了测试与分析,结果显示,东西伯利亚陆架表层沉积生物硅含量为0.42%~14.11%(平均值为3.12%),大致以165°E~170°E为界,界限以西的拉普捷夫海和东西伯利亚海西部生物硅含量较低(平均值为1.56%),界限以东的东西伯利亚海东部和楚科奇海中西部生物硅含量较高(平均值为9.7%)。综合分析表明,生物硅高值区主要是东西伯利亚海东部及楚科奇海受季节性海冰及太平洋入流水携带更多的营养物质造成的,而低值区除受常年海冰覆盖影响外,河流径流量增加和硅质生物的溶解作用也会导致生物硅含量降低。生物泵效率指标揭示东西伯利亚陆架海域,特别是楚科奇海可能是吸收全球大气CO_(2)的重要汇区。To reveal changes and controlling factors of the primary productivity in the Arctic Ocean shelf area is of crucial significance for assessing the status of the Arctic in global change.In this study,we have conducted the analysis of bio-genic silica in 87 surface sediment samples from the Arctic East Siberian Shelf(ESS).The results indicated that the bio-genic silica contents in the surface sediments of the ESS range from 0.42%to 14.11%(with an average of 3.12%).Roughly bounded by 165°E-170°E,biogenic silica contents of surface sediments in the Laptev Sea and the western part of the East Siberian Sea where are in the west side of this boundary are relatively low(with an average of 1.56%),while those of the eastern part of the East Siberian Sea and the central-western part of the Chukchi Sea,located in the east side of this boundary,are relatively high(with an average of 9.7%).Comprehensive analysis indicated that the high values of biogenic silica in sediments were mainly resulted from the input of more nutrients carried by seasonal sea ice and nutrientrich Pacific inflow in the eastern part of the East Siberian Sea and the Chukchi Sea,while the low contents of biogenic silica in sediments were caused by the influence of perennial sea-ice cover and the runoff increase and dissolution of siliceous organisms.The indicator of biogenic pump efficiency revealed that the ESS,especially the Chukchi Sea,could be served as an important sink for absorbing atmospheric CO_(2) on a global scale.

关 键 词：生物硅 海冰 初级生产力 东西伯利亚陆架 北极 

分 类 号：P593[天文地球—地球化学]