| Benthic foraminiferal δ~(13)C minimum events in the southeastern Okhotsk Sea over the last 180 ka |
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| 基金项目： | Acknowledgments This work was supported by the National Basic Research Program of China （2013CB429700）, the Basic Scientific Fund for the National Public Research Institutes of China （2012G07, 2013G38）, the National Natural Science Foundation of China （40431002, 4071006900 and 40906035）, and the Youth Marine Sci- ence Foundation of the State Oceanic Administration （2013313）. The authors appreciate the helpful suggestions of Prof. Jian Zhimin and are grateful to Prof. Cheng Xinrong for analyzing the foraminiferal stable isotopes, as well as to Prof. Zhang Chuanlun for his help in measuring the archaeal lipid biomarkers. We are also grateful to the National Ocean Science AMS Facility at the Woods Hole Oceanographic Institution for the radiocarbon dating and to Si Heyuan for selecting all the foraminiferal samples. Special thanks go to Dr. Christian Millo for his valuable suggestions when we were preparing the manuscript and to Dr. N V Bubenshchikova for her help in benthic foraminiferal identification. |
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| 摘 要： | A total of six d13C minimum events,i.e.,VI,V,IV,III,II,and I,were observed via a stable carbon and oxygen isotope analysis of infaunal benthic foraminifera Uvigerina spp.in gravity core OS03-1 in the southeastern Okhotsk Sea over the last 180 ka.These events occurred at112–109,102–90,85–76,57–54,44–40,and 17–10 ka BP.The largest negative excursions reached 2.5%in event V and were greater than 1%in the other events.We proposed that all d13C minimum events were caused by the increase in sea surface water productivity,the weakened formation of Okhotsk Sea intermediate water,and the enhancement of the oxygen minimum zone.The negative excursions were unaffected by methane hydrate destabilization and subsequent methane release based on the results obtained by using archaeal lipid markers.
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| 关 键 词： | 鄂霍次克海 底栖有孔虫 东南部 事件 氧同位素分析 甲烷水合物 甲烷释放 分解释放 |
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