| 贵州七星洞石笋记录的一次强降水事件的探讨 |
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| 引用本文：殷建军,林玉石,唐伟,程海,EDWARDS R L.2016.贵州七星洞石笋记录的一次强降水事件的探讨[J].地球学报,37(3):326-332. |
| DOI：10.3975/cagsb.2016.03.09 |
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| 基金项目:中国地质科学院基本科研业务费项目(编号: YWF201414);中国地质科学院岩溶地质研究所基本科研业务费项目(编号: 2014025; 201319);中国地质调查局地质调查项目(编号: 12120113006700) |
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| 中文摘要:全球变暖、极端事件频发背景下, 研究极端事件发生规律, 并准确预测未来极端事件的发生, 已经成为目前极端事件研究的现实而紧迫的任务。利用地质载体重建过去极端事件的发生规律是极端事件研究的重要手段。本研究以贵州七星洞两个具有相似沉积特征的文石-方解石石笋对过去发生的一次强降水事件进行了探讨。主要认识有: (1)七星洞QX1和QX6石笋分别记录的黄褐色纹(微)层具有相似的沉积特征, 为强降水携带粘土沉积形成; (2)两个石笋黄褐色纹(微)层发生的时间经推算在误差范围内一致, 发生在公元(1868±1)年; (3)此次强降水事件发生的气候背景为: 长时间的干旱导致洞顶植被覆盖和土壤湿度减小, 而1869年的雨季多雨, 在强降水携带下粘土沉积于石笋表面形成纹(微)层。此次事件的研究为东亚季风区极端降水事件研究提供了新的思路。 |
| 中文关键词:强降水事件 石笋 七星洞 黄褐色纹(微)层 |
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| A Tentative Discussion on a Heavy Precipitation Event Recorded by Stalagmites from Qixing Cave, Guizhou Province |
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| Abstract:In the background of global warming and higher frequency of extreme events, the study and investigation of the mechanism of extreme events that are likely to happen at present and in the future constitute a realistic and urgent work. Using geological records to reconstruct the past extreme events is an important method for detecting the extreme events. In this study, choosing Qixing Cave (25°59′N, 107°16′E, 978 m a.s.l.) in Guizhou Province as the study object, the authors investigated two calcite-aragonite stalagmites with similar depositional characteristics, and found that the same tawny laminas deposit in the top part of the two stalagmites may record the same heavy precipitation event. Some conclusions have been reached: (1) The tawny laminas recorded by stalagmites QX1 and QX6 have the same depositional characteristics, formed by clay carried by heavy precipitation. (2) The formation time of the two tawny laminas is the same within error, i.e., at AD (1868±1). (3) Climatic background of this heavy precipitation event was as follows: long time drought caused the reduction of vegetation covers and soil moisture, whereas there existed wet rainy season in 1869, and the clay carried by heavy precipitation was deposited on the surface of stalagmite to from lamina. The results obtained by the authors have opened a new train of theought for extreme precipitation research in East Asian monsoon area. |
| keywords:heavy precipitation event stalagmite Qixing Cave tawny lamina |
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