Stable isotope and Caesium records of sediment core LG06
Cobertura |
LATITUDE: 37.133125 * LONGITUDE: 97.549353 |
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Data(s) |
17/06/2012
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Resumo |
The oxygen isotopic composition of ostracod shells in lakes has been used as a useful indicator in palaeolimnological research and has provided some important contributions to the understanding of lacustrine systems. Usually, the oxygen isotopic compositions of ostracods from the lake sediments are interpreted as changes in effective precipitation, temperature and evaporation/input water ratio in a sub-arid or arid area. Here, we compare a 150-year-long oxygen-isotope record that was derived from ostracod carbonate from the sediments of Lake Gahai in the Qaidam Basin with meteorological data (precipitation) and tree-ring evidence for changing precipitation. Our results show that the oxygen isotopic compositions of ostracod shells are related to precipitation over the past 150 years. In general, increased precipitation accompanied a shift to less positive d18O values in the lake water, and thus in the ostracod shells, whereas decreased precipitation coincided with the opposite in Lake Gahai over the past 150 years. Therefore, we conclude that the oxygen isotopic compositions of ostracod shells can be used to indicate changes in precipitation over a short time scale in Lake Gahai. |
Formato |
application/zip, 2 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.784342 doi:10.1594/PANGAEA.784342 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Li, Xiangzhong; Liu, Weiguo; Xu, Liming (2012): Stable oxygen isotope of ostracods in recent sediments of Lake Gahai in the Qaidam Basin, northwest China: The implications for paleoclimatic reconstruction. Global and Planetary Change, 94-95, 13-19, doi:10.1016/j.gloplacha.2012.06.005 |
Palavras-Chave | #137Cs; Age; AGE; Caesium 137 activity per mass; Depth; DEPTH, sediment/rock; GC; Gravity corer; Label; Lake Gahai, Qaidam Basin, Qinghai Province, northwest China; LG06; Ostrac d13C; Ostrac d18O; Ostracoda, d13C; Ostracoda, d18O; Sample code/label |
Tipo |
Dataset |