| 广西桂林凉风洞秋冬季滴水和沉积物氧同位素对极端降水的记录研究 |
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| 关键词:extreme precipitation drip water sediments hydrogen and oxygen isotopes |
| 基金项目:国家自然科学基金项目(编号: 41501222; 41530316; 41701235);广西青年科学基金项目(编号: 2014GXNSFBA118227);中国地质调查局地质调查项目(编号: DD20160305) |
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| 摘要: |
| The Effect of Extreme Precipitation on Stable Isotope Compositions of Drip Water and Sediments during Autumn and Winter at Liangfeng Cave in Guilin, Guangxi |
| In recent years, extreme climate events have increased dramatically due to global environmental change. As environment information recording time is short, it is necessary to interpret extreme climate events in stalagmites. In this study, precipitation, drip water and sediments were monitored with high resolution from September 2017 to January 2018 in Liangfeng Cave, Guilin City, Guangxi. The precipitation samples were measured for δD and δ18O isotope values. The results indicate that δD and δ18O isotope compositions of precipitation have obvious positive variations caused by water vapor source in the study area. The local meteoric water line (LMWL) is δD = 8.8 δ18O + 16.38. The precipitation is the only source for Liangfeng cave, its oxygen isotope signals are reflected in the drip waters, and are recorded in the sediments. Nevertheless, cave drip waters may be mixed caused by precipitation which dropped in the old days before entering the cave and precipitation which dropped in the old days affected by evaporation effect through the epikarst. Therefore, δ18O values of drip water show more positive excursion than precipitation. However, δ18O of the sediment response time of extreme precipitation events are different due to the influence of different hydrogeochemical processes. Therefore, monitoring δ18O of drip water and sediment response process to environmental information can provide accurate interpreting paleoclimate information recorded by oxygen isotope in the stalagmite. |
| WU Xia,PAN Mou-cheng,CAO Jian-hua,ZHU Xiao-yan,ZHANG Mei-liang.2018.The Effect of Extreme Precipitation on Stable Isotope Compositions of Drip Water and Sediments during Autumn and Winter at Liangfeng Cave in Guilin, Guangxi[J].Acta Geoscientica Sinica,39(1):53-61. |
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