The Occurrence and Distribution of Long Chain Alkenones in Lakes
详细信息
- 责任者：Sun Qing (National Research Center of Geoanalysis ; Beijing 100037 ; China) ; Chu Guoqiang
- 刊名：Acta Geoscientica Sinica
- 出版年：2010
- 卷期：31(4)
- 关键词：湖泊沉积物 ; lake sediments ; 水化学 ; hydrochemistry ; 环境 ; environment
- 页码：p.485-494
- 图表：4 illus., 83 refs.
- 分类号：0803
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
///The alkenone unsaturation paleothermometer has been successfully and widely applied to reconstructing SST in most oceanographic settings.The utility of the alkenone unsaturation index in the marine system has stirred the interest in the study of LCK in the limnic system, in the hope that it can also be used as a paleotemperature proxy in lacustrine sediments. Empirical relationships between the alkenone unsaturation index U37k’and different tempera-ture sets(mean annual air temperature, mean annual air temperature in different seasons,and lake surface water temperature of July)were tested. The authors’ studies show that the alkenone unsaturation index U37k’is strongly controlled by environmental temperature the precursor organisms live in, and can be used for palaeoclimate reconstruction. This supports the suggestion that the biosynthetic pathway of alkenones and the mechanism of their temperature signal may be similar in both marine and limnic systems. LCK might be used as an important paleotemperature proxy in the limnic environment.