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引用本文:沈吉,吴瑞金,羊向东,潘红玺,安芷生.大布苏湖沉积剖面碳酸盐含量、氧同位素特征的古气候意义.湖泊科学,1997,9(3):217-222. DOI:10.18307/1997.0304
Shen Ji,Wu Ruijin,Yang Xiangdong,Pan Hongxi,An Zhisheng.Paleoclimatic change inferred from δ18O and carbonate content of the section in Dabusu Lake. J. Lake Sci.1997,9(3):217-222. DOI:10.18307/1997.0304
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大布苏湖沉积剖面碳酸盐含量、氧同位素特征的古气候意义
沈吉1, 吴瑞金1, 羊向东1, 潘红玺1, 安芷生2
1.中国科学院南京地理与湖泊研究所, 南京 210008;2.西安黄土与第四纪地质国家重点实验室, 西安 730000
摘要:
对大布苏湖沉积剖面碳酸盐含量和氧同位素特征研究表明,湖区15000年以来经历了多期冷湿与暖干气候旋回,大约距今6700年左右,气候变干并进入稳定的温暖时期,湖水逐渐高度浓缩,形成了现今的盐碱湖。
关键词:  碳酸盐含量  氧同位素  古气候  大布苏湖
DOI:10.18307/1997.0304
分类号:
基金项目:国家自然科学基金资助项目(编号:49372129)
Paleoclimatic change inferred from δ18O and carbonate content of the section in Dabusu Lake
Shen Ji1, Wu Ruijin1, Yang Xiangdong1, Pan Hongxi1, An Zhisheng2
1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008;2.Laboratory of Loess and Quaternary Geology, Xi'an 730000
Abstract:
Closed saline lake is sensitive to the paleoclimatic change. The paleoclimatic change will bring about change of the lake level, saltness of lake water and type of ionic composition, which may be recorded in lake sediments. According to the vertical distribution of δ18O and carbonate content of Dabusu Lake, the paleoclimatic evolution of this region since 15 000 years has been recorivStructed as follows:15 400-14 000 aB. P. (depth 8.10-7.30m);the climate was cold and wet.resulting in a high lake level and stable environment. 14000-11 600 aB. P. (depth 7.30-6.00m):the climate was dry and temperate heading to rapid decline of water level. 11 600-9 500 aB. P. (depth 6.00-4.85m):the climate was cold and wet. 9 500-7 840 aB. P. (depth 4.85-3.95m):the climate became warm and dry again and the lake level was low. 7 840-6 740 aB. P. (depth 3.95-3.35m);the temperature fell and the lake level rose. The climate was cold and wet. Since 6 740 aB. P. (depth 3.35-Om):the climate became warm and dry. The lake water condensed rapidly and finally a saline lake came into being.
Key words:  Carbonate content  oxygen isotope  paleoclimate  Dabusu Lake
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