| 小冰期气候的湖北石笋碳同位素记录 |
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| 引用本文： | 陈剑舜,张伟宏,陈仕涛,邵庆丰,赵侃,尹敬文,朱丽东.小冰期气候的湖北石笋碳同位素记录[J].沉积学报,2020,38(3):497-504. |
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| 作者姓名： | 陈剑舜 张伟宏 陈仕涛 邵庆丰 赵侃 尹敬文 朱丽东 |
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| 作者单位： | 1.浙江师范大学地理与环境科学学院, 浙江金华 321004 |
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| 基金项目： | 国家自然科学基金项目41602350国家自然科学基金项目41572340国家自然科学基金项目41572345 |
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| 摘 要： | 研究季风区小冰期的结构特征和区域响应有助于深入了解季风系统与地球内外驱动力的耦合关系。利用湖北神农架永兴洞YX275石笋的7个230Th年龄和120个碳同位素数据，建立了1 360~1 955 AD期间5年分辨率的石笋碳同位素序列。石笋δ13C与δ18O记录在长期趋势上有很好的对应关系，对小冰期气候响应明显，δ13C记录在大尺度季风环流影响下主要反映了局域湿度变化特征。δ13C序列在1 453~1 890 AD显著正偏，表明小冰期时湿度明显降低。此外，石笋δ13C与亚洲夏季温度、南方涛动指数和热带辐合带记录有较好的一致性，表明亚洲大陆夏季温度和太平洋水汽可能通过影响夏季风的强弱来调控湖北地区的湿度变化。在小冰期内部，δ13C记录在1 450~1 550 AD和1 790~1 830 AD出现进一步正偏，这些振荡分别对应于太阳活动的Sp?rer和Dalton极小期，暗示太阳活动减弱期对中国中部小冰期水文振荡的进一步调控作用。
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| 关 键 词： | 小冰期 石笋 碳同位素 局域水文 |
| 收稿时间： | 2019-03-27 |
Carbon Isotope Record in Stalagmites from Hubei during the Little Ice Age |
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| Institution: | 1.College of Geography and Environment Science, Zhejiang Normal University, Jinhua, Zhejiang 321004, China2.College of Geography Science, Nanjing Normal University, Nanjing 210023, China |
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| Abstract: | Studying the structural characteristics and regional response in the monsoon region during the Little Ice Age(LIA)is helpful in understanding the coupling relationship between the monsoon system and the earth's internal and external driving forces. Using 7 230Th ages and 120 carbon isotope data from the YX275 stalagmite of Yongxing Cave, Hubei Province, we establish the carbon isotope time-series with a 5-yr-resolution from 1 360-1 955 AD. A close similarity between the long term trend of carbon and oxygen isotope records(δ13C and δ18O)indicates that the δ13C record responds to climate change during the LIA. Stalagmite δ13C mainly reflects the local humidity variation influenced by the large-scale monsoon circulation. The δ13C values show a significantly positive shift from 1 453-1 890 AD, indicating that the soil moisture decreased significantly during the LIA. The stalagmite δ13C record is consistent with the Asian summer temperature, the Southern Oscillation Index, and the mean position of the intertropical convergence zone(ITCZ), suggesting that the Asian continental summer temperature and Pacific Ocean water vapor may regulate the humidity variation in Hubei province by influencing the strength of the summer monsoon. During the LIA, the δ13C record was heavier in 1 460-1 550 AD and 1 815-1 865 AD. These fluctuations correspond to the Sp?rer and Dalton Minimums, respectively, implying that the solar activity weakening period further regulated the hydrological oscillations during the LIA in central China. |
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