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宋乐慧,韩喜彬,李家彪,高抒,刘庚,龙盼盼.罗斯海西部末次冰盛期以来沉积环境重建:有机碳与生物标志化合物分析[J].365体育开户_万博体育365_365棋牌体育,2019,41(9):52-64
罗斯海西部末次冰盛期以来沉积环境重建:有机碳与生物标志化合物分析
Western Ross Sea sedimentary environment reconstruction since the Last Glacial Maximum based on organic carbon and biomarker analyses
投稿时间:2018-11-12??修订日期:2019-03-30
DOI:10.3969/j.issn.0253-4193.2019.09.005
中文关键词:??有机质??生物标志化合物??沉积环境??末次冰盛期??罗斯海
英文关键词:organic matter??biomarker??sedimentary environment??Last Glacial Maximum??Ross Sea
基金项目:“全球变化与海气相互作用”专项(GASI-GEOGE-03,GASI-04-01-02);国家自然科学基金(41476047,41476069);极地考察业务化与科研:国家南极观测监测网运维与管理;极地考察业务化与科研:南北极环境综合考察评估与管理。
作者单位E-mail
宋乐慧?南京大学 海岸与海岛开发教育部重点实验室, 江苏 南京 210023??
韩喜彬?国家海洋局海底科学重点实验室, 浙江 杭州 310012
自然资源部第二海洋研究所, 浙江 杭州 310012?
hanxibin@sio.org.cn?
李家彪?国家海洋局海底科学重点实验室, 浙江 杭州 310012
自然资源部第二海洋研究所, 浙江 杭州 310012?
?
高抒?南京大学 海岸与海岛开发教育部重点实验室, 江苏 南京 210023??
刘庚?国家海洋局海底科学重点实验室, 浙江 杭州 310012
自然资源部第二海洋研究所, 浙江 杭州 310012?
?
龙盼盼?国家海洋局海底科学重点实验室, 浙江 杭州 310012
自然资源部第二海洋研究所, 浙江 杭州 310012?
?
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中文摘要:
??????本文研究采自位于南极罗斯海西部的ANT32-RB16C柱状沉积物,根据粒度、有机碳和生物标志化合物数据探讨末次冰盛期(24.8 ~20 ka BP)以来该地区有机质来源及沉积环境特征。该柱状样记录了冰架下沉积、冰架前沉积、开阔海域沉积的沉积环境。指示有机质来源的生物标志化合物指标表明该柱状样中所含有机质主要为浮游植物、细菌等海源输入,同时伴有少量陆源物质混合输入。末次冰盛期,由于冰架的影响有机质含量较低,环流影响使得有机质受低等浮游藻类生物等海源影响较大。末次冰消期(20~11.7 ka BP),罗斯冰架消退,冰川溶解释放的有机质在此沉积,使得陆源有机质输入增多,有机质含量升高。进入全新世,有机质含量较末次冰盛期和末次冰消期明显升高,海源输入比例增大,同时细菌等原核生物增多,导致短链正构烷烃降解程度较大。研究区的氧化还原环境主要受冰架与海冰限制作用的影响,与有机质含量和高氧的南极底层水关系不大。总体来说,从末次冰盛期到末次冰消期,研究区沉积环境受罗斯冰架进退影响,全新世以来受气候变化影响。
英文摘要:
??????Analyses of grain size, organic carbon and biomarker have been carried out for the core ANT32-RB16C, in order to identify the source of organic matter and reconstruct the sedimentary environment since the Last Glacial Maximum in the western Ross Sea. From the bottom to the top within the core, sub-ice-shelf, pre-ice-shelf and open-marine sedimentary environments can be differentiated. The combined parameters of biomarker indicate that organic matter is mainly a mixed input of terrigenous and marine origin. During the Last Glacial Maximum (24.8-20 ka BP), under the influence of ice sheet and the current condition, the organic matter content was low and its source was associated mainly with a marine origin, with a relatively low plankton productivity. During the Last Deglaciation (20-11.7 ka BP), the organic matter released by the dissolution of the glaciers in the retreat process of the Ross Ice Shelf, caused the increase of terrestrial organic matter. During the Holocene, the content of organic matter increased significantly, together with the proportion of marine origin input. The number of prokaryotes such as bacteria increased, resulting in a greater degree of degradation of short-chain n-alkanes. The redox condition in the study area is mainly affected by the ice shelf and sea ice limitation, and has little relationship with the organic matter content and the high-oxygen Antarctic Bottom Water. In general, from the Last Glacial Maximum to the Last Deglaciation, the study area sedimentary environment was affected by the Ross Ice Shelf, and by the climate since the Holocene.
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