地理科学 ›› 2013, Vol. 33 ›› Issue (5): 629-634.doi: 10.13249/j.cnki.sgs.2013.05.629

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高分辨率石笋记录的三峡库区小冰期气候变化

杨勋林1(), 陈发虎2, 袁道先1,3, 程海4, 张月明1, 黄帆1   

  1. 1. 西南大学地理科学学院 三峡库区生态环境教育部重点实验室, 重庆 400715
    2.兰州大学西部环境教育部重点实验室, 甘肃 兰州 730000
    3.中国地质科学院岩溶地质研究所 国土资源部岩溶动力学重点实验室, 广西 桂林 541004
    4.美国明尼苏达大学地质与地球物理系,美国 明尼苏达, MN55455
  • 收稿日期:2012-06-25 修回日期:2012-10-12 出版日期:2013-05-20 发布日期:2013-05-20
  • 作者简介:

    作者简介:杨勋林(1974-),男,河南潢川人,副教授,硕士生导师,从事第四纪环境演变研究。E-mail:xlyang9999@163.com

  • 基金资助:
    国家自然科学基金项目(41072141,41272192)、重庆市自然科学基金项目(CSTC2009BB7107)、中央高校基本科研业务费重大项目(XDJK2012A003)、西南大学博士基金项目(SWUB2007043)资助

Climate Change During Little Ice Age with High-resolution Stalagmite Record in the Three-Gorges Reservoir Area

Xun-lin YANG1(), Fa-hu CHEN2, Dao-xian YUAN1,3, Hai CHENG4, Yue-ming ZHANG1, Fan HUANG1   

  1. 1. Key Laboratory of Eco-environments in Three Gorges Reservoir (Ministry of Education) School of GeographyScience, Southwest University, Chongqing, 400715, China
    2. Key Laboratory of Western China's Environmental Systems (Ministry of Education), Lanzhou University, Lanzhou, Gansu 730000, China
    3. Karst Dynamics Laboratory, Ministry of Land and Resources, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, Guangxi 541004, China
    4. Department of Geology and Geophysics, University of Minnesota, Minnesota, MN 55455, USA
  • Received:2012-06-25 Revised:2012-10-12 Online:2013-05-20 Published:2013-05-20

摘要:

基于重庆水鸣洞石笋(NSM03)7个230Th年代数据和438个δ18O数据建立三峡库区1250~1750 A.D.时段分辨率约为1 a的δ18O记录。分析显示石笋δ18O值在1280 A.D.开始迅速偏重,在1300 A.D.附近偏到近500 a来最重,显示季风迅速减弱,库区进入小冰期。石笋记录显示小冰期存在明显的年代际尺度干湿波动,特别是在1400~1650 A.D.时段石笋δ18O值高频振荡,显示季风降水处于频繁波动期。功率谱分析显示石笋δ18O序列具有显著树轮Δ14C周期和ENSO准周期,揭示太阳活动是小冰期主要驱动因素,同时受到海气耦合作用影响。

关键词: 石笋, 氧同位素, 亚洲季风, 小冰期, 三峡库区

Abstract:

A high-resolution oxygen isotope profile of the past 500 years was established with an average resolution of approximately one year, based on 7 high-precision 230Th dates and 438 stable oxygen isotope ratios (δ18O) which were obtained from a stalagmite (NSM03) collected from Shuiming Cave, Chongqing City. So the variation of summer monsoon precipitation in the Three-Gorges reservoir area during the period of 1250-1750 A.D. was reconstructed. The δ18O value of the stalagmite NSM03 became heavier rapidly from 1280 A.D., and reached to the heaviest around 1300 A.D. During the past 500 years, the Asian monsoon became weak rapidly, implying the Little Ice Age (LIA) starts. The trend of δ18O record from stalagmite NSM03 coincides with the other stalagmite records of the Asian monsoon region within the limits of dating error. Results showed that there were obvious interdecadal wet and dry fluctuations in LIA, especially during 1400-1650A.D. δ18O value of the stalagmite fluctuated dramatically indicating that monsoon precipitation was in frequently fluctuate period. Spectral analysis showed NSM03 δ18O sequence had significant cycle of 98, 26, 5, 4, and 3 years (above the 99% confidence level). Similar periodicities of 98 and 26 years were proved by the δ18O record, further supporting the idea that solar changes were mainly responsible for Asian monsoon intensity changes in LIA; and 5, 4 and 3 years were consistent with the 2-7 years standard cycle of El Nino-Southern Oscillation (ENSO), which implied that LIA climate variation had a close relation with ENSO.

Key words: stalagmite, δ18O, LIA, Asian Monsoon, Three-Gorges reservoir area

中图分类号: 

  • P532