SPELEOTHEMS AS PROXY FOR THE CARBON-ISOTOPE COMPOSITION OF ATMOSPHERIC CO2

被引：39

作者：

BASKARAN, M ^{[1
]}

KRISHNAMURTHY, RV ^{[1
]}

机构：

[1] WESTERN MICHIGAN UNIV, INST WATER SCI, KALAMAZOO, MI 49008 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 1993年 / 20卷 / 24期

关键词：

D O I：

10.1029/93GL02690

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We have measured the stable isotope ratios of carbon in a suite of recent cave deposits (< 200 years) from the San Saba County, Texas. USA. The methodology for dating these deposits using excess Pb-210 was recently established [Baskaran and Iliffe, 1993]. The carbon isotope ratios of these samples, spanning the time period approximately 1800-1990 AD, reflect the carbon isotope ratio of atmospheric CO2 for the same period. The pathways by which the deltaC-13 of atmospheric CO2 is imprinted on these speleothems can be explained using a model developed by Cerling (1984). The results suggest that the carbon isotope ratios of speleothems can be used to develop long-term, high-resolution chronologies of the deltaC-13 of atmospheric CO2 and, by implication, the concentration of the atmospheric CO2.

引用

页码：2905 / 2908

页数：4

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