| Oceanic environmental changes of subarctic Bering Sea in recent 100 years: Evidence from molecular fossils |
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| 作者姓名： | LU Bing CHEN Ronghua ZHOU Huaiyang WANG Zipan CHEN Jianfang & ZHU Chun Key Laboratory of State Oceanic Administration The Second Institute of Oceanography Hangzhou China |
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| 作者单位： | LU Bing，CHEN Ronghua，ZHOU Huaiyang，WANG Zipan，CHEN Jianfang & ZHU Chun Key Laboratory of State Oceanic Administration，The Second Institute of Oceanography，Hangzhou 310012，China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，中国科学院资助项目，China's First Arctic Scientific Expedition |
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| 摘 要： | The objectives of the past studies of global cli-matological changes were to obtain and interpret in-formation about various macroclimates and paleoenvi-ronments, and to understand changing processes andmechanisms of the global system environment, so asto provide basic materials for establishing a physicalmodel of forecasting climate environment. To reduceuncertainty of forecast, it is particularly important totake variation sequences in short dimension and highresolution in global climatologic…
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| 收稿时间： | 8 October 2002 |
Oceanic environmental changes of subarctic Bering Sea in recent 100 years: Evidence from molecular fossils |
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| LU Bing,CHEN Ronghua,ZHOU Huaiyang,WANG Zipan,CHEN Jianfang & ZHU Chun Key Laboratory of State Oceanic Administration,The Second Institute of Oceanography,Hangzhou ,China.Oceanic environmental changes of subarctic Bering Sea in recent 100 years: Evidence from molecular fossils[J].Science in China(Earth Sciences),2005,48(4):555-564. |
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| Authors: | LU Bing CHEN Ronghua ZHOU Huaiyang WANG Zipan CHEN Jianfang ZHU Chun |
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| Institution: | Key Laboratory of State Oceanic Administration, The Second Institute of Oceanography, Hangzhou 310012, China |
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| Abstract: | The core sample B2–9 from the seafloor of the subarctic Bering Sea was dated with 210Pb to obtain a consecutive sequence of oceanic sedimentary environments at an interval of a decade during 1890–1999. A variety
of molecular fossils were detected, including n-alkanes, isoprenoids, fatty acids, sterols, etc. By the characteristics of
these fine molecules (C27, C28, and C29 sterols) and their molecular indices (Pr/Ph, σC+
22/σC−
21, CPI and C18∶2/C18∶0) and in consideration of the variation of organic carbon content, the 100-year evolution history of subarctic sea paleoenvironment
was reestablished. It is indicated that during the past 100 years in the Arctic, there were two events of strong climate warming
(1920–1950 and 1980–1999), which resulted in an oxidated sediment environment owing to decreasing terrigenous organic matters
and increasing marine-derived organic matters, and two events of transitory climate cooling (1910 and 1970–1980), which resulted
in a slightly reduced sediment environment owing to increasing terrigenous organic matters and decreasing marine-derived organic
matters. It is revealed that the processes of warming/cooling alternated climate are directly related to the Arctic and global
climate variations. |
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| Keywords: | subarctic molecular fossil paleoenvironment record of stratigraphy |
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