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引用本文:孙立广,谢周清,赵俊琳,项亮.南极阿德雷岛湖泊沉积210Pb、137Cs定年及其环境意义.湖泊科学,2001,13(1):93-96. DOI:10.18307/20010114
SUN Liguang,XIE Zhouqing,ZHAO Junlin,XIANG Liang.210Pb, 137Cs Dating of Lake Sediments from Ardley Island (Maritime Antarctic)and Their Environmental Implications. J. Lake Sci.2001,13(1):93-96. DOI:10.18307/20010114
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南极阿德雷岛湖泊沉积210Pb、137Cs定年及其环境意义
孙立广1, 谢周清1, 赵俊琳2, 项亮3
1.中国科学技术大学极地研究室, 合肥 230026;2.北京师范大学环境科学研究所, 北京 100875;3.中国科学院南京地理与湖泊研究所, 南京 210008
摘要:
测试了南极阿德雷岛两个湖泊(Y2和G)沉积物的210Pb和137Cs比度.根据210Pb和137Cs比度垂向变化特征,采用CRS模式对G湖进行了定年,年龄跨度大约为134±43年,并据此计算了G湖的沉积速率.近大约100年来G湖呈增长变化的沉积速率以及沉积物210Pb,137Cs蓄积量和沉降通量远大于大气直接沉降,可能是温度升高引起该地区大量冰雪(盖)融水携带补充的结果.
关键词:  南极  湖泊沉积物  210Pb  137Cs  定年
DOI:10.18307/20010114
分类号:
基金项目:国家自然科学基金(40076032);中国科学院创新项目(KZCX2-303)联合资助
210Pb, 137Cs Dating of Lake Sediments from Ardley Island (Maritime Antarctic)and Their Environmental Implications
SUN Liguang1, XIE Zhouqing1, ZHAO Junlin2, XIANG Liang3
1.Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, P. R. China;2.Institute of Environmental Science, Beijing Norma l University, Beijing 100875, P. R. China;3.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
Abstract:
The activity of 210Pb and 137Cs of lake sediments, namely Y2 and G, respectively from Ardley Island, Antarctica have been measured.According to the profiles of 210Pb and 137Cs activity, we used CRS mo del to date the G lake, which spans about 134±43 years.Base on the dating, we estimate the velocity of deposition.The increased sedimentation rates and the inventories of 210Pb and 137Cs as well as their flux being higher than the atmospheric deposition could be reasonably attributed to the supply of agreat amount of ice-melt water.
Key words:  Antarctica  lake sediment  210Pb dating  137Cs dating
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