摘要
本研究利用南极菲尔德斯半岛长城站附近的西湖沉积物 ,研究该地区的环境变化状况。对 1 993年采集的 9.2 8m长的西湖岩芯 (GA - 7)进行等间距分样 (2cm) ,进行了有机碳、δC1 3org、磁化率和粒度等环境指标分析。利用本研究区湖相沉积物的1 4C测年数据 ,发现距今 1 2 60 0年以来 ,南极菲尔德斯半岛地区至少出现过四次气温升高时期 ,即 480 0 - 4 4 0 0aB .P .、360 0 -3350aB .P .、2 1 0 0 - 1 80 0aB .P .和 90 0aB .P .-现在。研究同时发现 ,湖相沉积物的有机碳含量和δC1 3org存在显著正相关关系 。
Lake core taken from Xihu in Fildes Peninsula of King Gorge Island, Antarctic could reveal the environmental change of the district.The lake core(GA 7)was 9.28 meters long and divided at 2 cm intervals. Through measuring the organic carbon,magnetic susceptibility,grain size and organic carbon isotope of GA 7 lake core , it was estimated by use of 14 C age data that there were four periods of higher temperature in Fildes Peninsula: 4800-4400aB.P., 3600-3350aB.P., 2100-1800aB.P. and 900aB.P.- present. Meanwhile, results show that there is a strikingly positive correlation between contents of organic carbon and that of organic carbon isotope(δC 13 org ) which could be the substitute indicators of environmental temperature.
出处
《极地研究》
CAS
CSCD
2002年第1期35-43,共9页
Chinese Journal of Polar Research
基金
国家"九五"重点科技攻关项目 ( 98 92 7 0 1 0 4 )。
