7ka以来海南双池玛珥湖气候环境演变的高分辨率沉积记录
发布时间：2018-10-10 18:35
【摘要】：通过对双池玛珥湖804 cm的沉积岩心进行含水量、干密度、粒度、磁化率、干湿色度、色度、有机碳氮含量及其同位素的测试分析,结合210Pb、137Cs、AMS14C的分析测试结果,重建了湖区7kaBP以来的气候环境演变历史。7～1.4 ka BP湖盆为沼泽相沉积,期间主要分为以下两个阶段:7056～6615 cal a BP,气候相对温和湿润;6615～1413 cal a BP,该阶段有效降水先减少后增加,气候总体表现为干热。1.4kaBP以来为浅湖沉积环境,该时期降水先增加后减少,整体气候相对凉干,该阶段磁化率的增加指示着人类活动的增强。岩心记录的近1500年来的气候变化,能够识别出较为干旱的MWP(约900～1200 AD)和相对湿润的LIA(约1300～1750 AD),MWP较干旱的气候环境与中国南方湖泊的沉积记录相一致性。在7～3 kaBP期间,湖盆气候逐渐干旱,这种变化趋势受控于太阳辐射和ITCZ的移动。晚全新世气候变化可与ENSO变化进行对比,近1500年指标时间序列存在6～8 a,18～20 a,88 a,103 a,215 a的周期,与ENSO和太阳活动的周期相对应。
[Abstract]:The moisture content, dry density, granularity, magnetic susceptibility, dry-wet chromaticity, organic carbon and nitrogen content and their isotopes in the sedimentary cores of 804 cm in Maer Lake, Shuangchi were measured and analyzed. The history of climatic and environmental evolution since 7kaBP has been reconstructed. The lake basin of 70.1.4 ka BP is a marsh sedimentary facies, which is mainly divided into two stages: 7056 cal a BP, climate is relatively mild and humid, and the effective precipitation at 6615 ~ 1413 cal a BP, decreases first and then increases. The climate is dry and hot. Since 1.4kaBP, the precipitation first increased and then decreased, and the whole climate was relatively cool and dry. The increase of magnetic susceptibility indicates the enhancement of human activities. The climate change recorded in the core over the past 1500 years can identify the relatively arid MWP (about 900 ~ 1 200 AD) and the relatively humid climate environment of LIA (about 1 300 ~ 1 750 AD), MWP), which are consistent with the sedimentary records of the southern lakes in China. During the period of 7 ~ 3 kaBP, the climate of the lake basin was gradually dry, which was controlled by the solar radiation and the movement of ITCZ. The late Holocene climate change can be compared with the ENSO change. In the last 1500 years, the index time series has a period of 6 ~ (8) a ~ (18) ~ (18) ~ (18) a ~ (88) a ~ (10 ~ 3) a ~ (2) a ~ 215a, corresponding to the period of ENSO and solar activity.
【学位授予单位】：中国地质科学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P532
本文编号：2262817
[Abstract]:The moisture content, dry density, granularity, magnetic susceptibility, dry-wet chromaticity, organic carbon and nitrogen content and their isotopes in the sedimentary cores of 804 cm in Maer Lake, Shuangchi were measured and analyzed. The history of climatic and environmental evolution since 7kaBP has been reconstructed. The lake basin of 70.1.4 ka BP is a marsh sedimentary facies, which is mainly divided into two stages: 7056 cal a BP, climate is relatively mild and humid, and the effective precipitation at 6615 ~ 1413 cal a BP, decreases first and then increases. The climate is dry and hot. Since 1.4kaBP, the precipitation first increased and then decreased, and the whole climate was relatively cool and dry. The increase of magnetic susceptibility indicates the enhancement of human activities. The climate change recorded in the core over the past 1500 years can identify the relatively arid MWP (about 900 ~ 1 200 AD) and the relatively humid climate environment of LIA (about 1 300 ~ 1 750 AD), MWP), which are consistent with the sedimentary records of the southern lakes in China. During the period of 7 ~ 3 kaBP, the climate of the lake basin was gradually dry, which was controlled by the solar radiation and the movement of ITCZ. The late Holocene climate change can be compared with the ENSO change. In the last 1500 years, the index time series has a period of 6 ~ (8) a ~ (18) ~ (18) ~ (18) a ~ (88) a ~ (10 ~ 3) a ~ (2) a ~ 215a, corresponding to the period of ENSO and solar activity.
【学位授予单位】：中国地质科学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P532
【相似文献】
相关期刊论文 前1条
1 徐振明，，齐国生，贾惠波，徐常胜;双池算法软件在对准偏差计算中的应用[J];光学学报;1995年10期
相关重要报纸文章 前3条
1 本刊记者 范河山;神岭山下万木春[N];山西经济日报;2008年
2 陈保平;为建设新农村修好致富路[N];山西经济日报;2005年
3 本刊记者 郭晋成 张旭艳 通讯员 任瑞斌;以城市管理年活动为契机推进小城镇建设[N];山西经济日报;2006年
相关硕士学位论文 前1条
1 汤文坤;7ka以来海南双池玛珥湖气候环境演变的高分辨率沉积记录[D];中国地质科学院;2017年
本文编号：2262817
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2262817.html
