白令海与西北冰洋表层沉积物中四醚膜类脂物研究及其生态和环境指示意义

doi:10.11867/j.issn.1001-8166.2013.02.0282

地球科学进展 ›› 2013, Vol. 28 ›› Issue (2): 282 -295. doi: 10.11867/j.issn.1001-8166.2013.02.0282

所属专题： IODP研究；

IODP研究上一篇

白令海与西北冰洋表层沉积物中四醚膜类脂物研究及其生态和环境指示意义

王寿刚 ¹，王汝建 ^1*，陈建芳 ²，陈志华 ³，程振波 ³，汪卫国 ⁴，黄元辉 ³

1.同济大学海洋地质国家重点实验室，上海 200092； 2.国家海洋局第二海洋研究所，浙江杭州 310012；3.国家海洋局第一海洋研究所，山东青岛 266061；4.国家海洋局第三海洋研究所，福建厦门 361005)

收稿日期:2013-01-16 修回日期:2013-01-25 出版日期:2013-02-10
通讯作者: 王汝建（1959-），男，云南昆明人，教授，主要从事海洋地质学、古海洋学与古气候学研究.E-mail:rjwang@tongji.edu.cn E-mail:rjwang@tongji.edu.cn
基金资助:
国家自然科学基金重点项目“重建西北冰洋晚第四纪的古海洋与古气候演变历史”(编号：41030859)；国家自然科学基金国际(地区)合作与交流项目(中俄)“西北冰洋过去的环境变化：来自沉积物的记录”(编号：41211120173)；南北极环境综合考察与评估专项“2012年度北极海域海洋地质考察”（编号：CHINARE2012-03-02）资助.

Spatial Distribution Patterns of GDGTs in the Surface Sediments from the Bering Sea and Arctic Ocean and Their Environmental Significances

Wang Shougang ¹, Wang Rujian ¹, Chen Jianfang ², Chen Zhihua ³, Cheng Zhenbo ³, Wang Weiguo ⁴, Huang Yuanhui ³

1.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;2.The Second Institute of Oceanography, State Oceanic Administration People’s Republic of China, Hangzhou 310012, China; 3.The First Institute of Oceanography, State Oceanic Administration People’s Republic of China, Qingdao 266061, China; 4.The Third Institute of Oceanography, State Oceanic Administration People’s Republic of China, Xiamen 361005, China

Received:2013-01-16 Revised:2013-01-25 Online:2013-02-10 Published:2013-02-10

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通过对中国第3次和第4次北极考察在白令海和西北冰洋采集的65个表层样沉积物中生物标记物四醚膜类脂物(GDGTs)的研究，发现西北冰洋表层沉积物中类异戊二烯和支链GDGTs的浓度分布大致以楚科奇海和波弗特海的陆坡为界线，呈现南高北低的特征，这一特征主要与水体生产力和陆源有机质的输入量有关。基于GDGTs的陆源输入指数BIT显示，从楚科奇海北部到高纬度区的阿尔法脊，陆源有机质的相对比例明显增加，与有机碳稳定同位素等结果一致，表明BIT可以用来指示北极陆源有机质输入量的变化。应用前人TEX^L₈₆-SST方程估算的研究区表面海水温度SST与现代年均SST和夏季平均SST的相关性较差，原因可能与陆源输入的类异戊二烯GDGTs干扰以及低的古菌生产力有关。从季节性海冰覆盖区到永久性海冰覆盖区，基于支链GDGTs的环化指数CBT明显升高，可能反映了CBT对海冰覆盖状况的响应，但其响应机制还不清楚。基于支链GDGTs的环化指数CBT和甲基化指数MBT估算的北极陆地年均大气温度和土壤pH差异较大，可能是由表层沉积物的来源复杂以及混合作用造成的。

关键词: 北冰洋, 白令海, GDGTs, TEX₈₆, CBT

Biomarker Glycerol Dialkyl Glycerol Tetraethers (GDGTs) was analyzed in 65 surface sediments from the Bering Sea and western Arctic Ocean recovered during the 3^rd and 4^th Chinese National Arctic Expeditions. The distribution patterns of isoprenoid and branched GDGTs concentration are divided by the Chukchi and Beaufort Sea Slope. GDGTs concentration is higher in the south of the slope than that in the north, which is controlled by water column productivity and terrestrial organic matter input. GDGTs based BIT suggests that terrestrial organic matter input increases from the north Chukchi Sea to Alpha Ridge, compared with marine organic matter, which is consistent with the results retrieved from organic carbon isotope ratios, suggesting that BIT is a reliable proxy in the Arctic Ocean. Sea Surface Temperatures (SST) derived by TEX^L₈₆ are not related to modern annual or summer mean SST, probably because of the mixed signal from terrestrial isprenoid GDGTs and low archaeal productivity in high Arctic region. Cyclisation ratio of Branched Tetraethers (CBT) show strong increase from seasonal sea ice area to permanent sea ice area, which may prove that CBT is sensitive to sea ice coverage. However, its mechanism remained unclear. Reconstructed terrestrial annual mean atmospheric temperature (MAT) and soil pH from branched GDGTs based CBT and Methylation index of Branched Tetraether (MBT) show extremely variability, which is probably affected by complicated sediment sources and soil mixing in transportation process.

Key words: Arctic Ocean, Bering Sea, GDGTs, TEX₈₆, CBT

中图分类号:

P727
P736.21

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