黄土高原西部石笋记录的H2事件特征

吴秀平; 吴锦奎; 侯典炯; 丁明虎; 孙维君; 桑文翠; 刘伟刚

doi:10.3799/dqkx.2013.047

黄土高原西部石笋记录的H2事件特征

doi: 10.3799/dqkx.2013.047

吴秀平^{1, 2,},
吴锦奎^3, ,,
侯典炯⁴,
丁明虎⁵,
孙维君⁶,
桑文翠¹,
刘伟刚⁷

1.
兰州大学西部环境与气候变化研究院, 甘肃兰州 730000
2.
中国科学院国家科学图书馆兰州分馆, 甘肃兰州 730000
3.
中国科学院内陆河流域生态水文重点实验室, 甘肃兰州 730000
4.
甘肃煤炭地质勘查院, 甘肃兰州 730000
5.
中国气象科学研究院气候系统研究所, 北京 100081
6.
中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室, 甘肃兰州 730000
7.
中国气象局兰州干旱气象研究所, 甘肃兰州 730020

基金项目:

国家自然科学基金委员会重点项目 41130638

冰冻圈科学国家重点实验室开放基金项目 SKLCS 2010-10

冰冻圈科学国家重点实验室自主研究项目 SKLCS-ZZ-2010-02

详细信息

作者简介:
吴秀平(1983-), 女, 博士研究生, 主要从事全球变化与地球科学信息研究.E-mail: tunxp07@lzu.edu.cn

通讯作者:
吴锦奎, E-mail: jkwu@lzb.ac.cn

中图分类号: P597
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出版历程
- 收稿日期: 2012-12-27
- 刊出日期: 2013-05-15

Characteristics and Variability of Heinrich-2 Event Recorded by Stalagmite Oxygen Isotopic Composition in the Western Loess Plateau

1.
Research School of Arid Environment & Climate Change, Lanzhou University, Lanzhou 730000, China
2.
Lanzhou Branch of the National Science Library, Chinese Academy of Sciences, Lanzhou 730000, China
3.
Key Laboratory of Ecological Hydrology of Inland River Basin, Chinese Academy of Sciences, Lanzhou 730000, China
4.
Gansu Province Exploration Institute of Coal Geology, Lanzhou 730000, China
5.
Institute of Climate System, Chinese Academy of Meteorological Sciences, Beijing 100081, China
6.
State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
7.
Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China

摘要

摘要: 青藏高原与黄土高原过渡带的甘肃武都万象洞位于现代夏季风的边缘区, 对气候变化极为敏感.通过洞内一支石笋WX40D的6个高精度TIMS-U系定年数据和616个样品的氧同位素测定, 建立了28.3~23.0 ka B.P., 分辨率约为10年的亚洲季风气候变化序列. 石笋δ¹⁸O记录揭示Marine Isotope Stage 2 (MIS2)早期东亚季风气候具有10~100 a尺度高频震荡特征, 从中识别出北大西洋Heinrich 2 (H2)特强冷事件, 且记录显示该事件开始于24.6 ka B.P., 呈突发式降温之后持续跌宕式降温变化. 对比研究发现, 万象洞石笋δ¹⁸O记录H2事件与葫芦洞、天鹅洞的石笋记录有差别, 但是与湖南金滩湾洞穴石笋δ¹⁸O记录、33°N太阳辐射强度以及极地GRIP冰心记录变化趋势一致, 表明季风边缘区气候变化主要受北半球中纬度太阳辐射能背景、北大西洋冰漂碎屑带的扩张以及低纬太平洋海表温度变化等因素的控制, 同时万象洞特殊的地理位置使得区域气候更易受到与极地气候有密切联系的亚洲冬季风和西风环流变化的影响.
- 万象洞 /
- 石笋 /
- 氧同位素 /
- H2事件 /
- 气候变化
Abstract: Wanxiang Cave is sensitive to climate change due to its special geographic location, located at the transition of Tibet plateau and Loess plateau. A 10-year resolution oxygen isotope record of stalagmite from the Wanxiang Cave, based on 6 precise ²³⁰Th dates and 616 oxygen isotopic measurements provides a detailed history of the Asian Monsoon from 28.3 to 23.0 ka B.P.. A high-resolution oxygen isotopic record reveals decadal-centural oscillations in air temperature in the East Asian monsoon climate area during the early time of marine isotope stadial 2 (MIS2). The most conspicuous feature in the oxygen isotopic record in the period is the particularly cold event synchronized with the penultimate Heinrich event (H2) in the northern Atlantic deep-sea records. This particular cold event, beginning at 24.6 ka B.P., δ¹⁸O record demonstrates that the event lasted 1 200 years with gradually cooling, which is different from δ¹⁸O record from Hulu Cave and Tian'e Cave—a gradually cooling tendency after the remarkable cooling down. However, the δ¹⁸O record from Wanxiang Cave matches well with 33°N insolation and δ¹⁸O record from Jintanwan, Hunan Province; The cooling event recorded in Wanxiang Cave is also consistent with δ¹⁸O record in GRIP. We maintain that this unique pattern of event recorded in the stalagmite δ¹⁸O might be controlled by various factors including solar radiation, expansion of ice raft debrise in the northern Atlantic and sea surface temperature.The particular location of the Wanxiang Cave makes the stalagmite δ¹⁸O easily affected by Asian winter monsoon and westly circulation correlated with Polar climate.
- Wanxiang Cave /
- stalagmite /
- oxygen isotopes /
- H2 event /
- climate change

HTML全文

图 1 万象洞石笋WX40D剖面(白色箭头标示了年代采样点所在层位)

Fig. 1. Profile of stalagmite WX40D from Wanxiang Cave

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图 2 石笋WX40D年代-深度模型

Fig. 2. The relationship of WX40D stalagmite ²³⁰Th dating and depth

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图 3 万象洞WX40D石笋δ¹⁸O记录

短线为WX40D石笋的实测年龄和误差；虚线为生长时段内WX40D石笋δ¹⁸O记录平均值；两处阴影分别为H2事件和Ⅰ、Ⅱ阶段的分界线

Fig. 3. The δ¹⁸O record of stalagmite WX40D from Wanxiang Cave, Gansu Province

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图 4 末次冰期晚期万象洞石笋WX40D δ¹⁸O与WX42A灰度记录(张德忠等, 2011)的H事件

Fig. 4. Comparison H events recorded by WX40D δ¹⁸O and WX42A gray scale during late last glacial

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图 5 万象洞WX40D石笋δ¹⁸O与格陵兰冰心记录GRIP温度记录(Rasmussen et al., 2008)

Fig. 5. Comparison of δ¹⁸O record of stalagmite WX40D Wanxiang Cave with GRIP

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图 6 万象洞WX40D石笋δ¹⁸O与东亚季风区石笋δ¹⁸O记录(葫芦洞，湖南金滩湾洞)

灰色阴影为H2事件

Fig. 6. Comparison of δ¹⁸O record of WX40D stalagmite Wanxiang Cave with Hulu Cave

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表 1 万象洞石笋WX40D的MC-ICP-MS铀系定年结果

Table 1. Results of ²³⁰Th dating for WX40D

样品编号	距离(mm)	²³⁸U(10^-9)	²³²Th(10^-12)	d²³⁴U^*测量值	²³⁰Th/²³⁸U活度比	²³⁰Th年龄(a)(未校正)	²³⁰Th年龄(a)(校正年龄)
WX40D-1	38.0	7 075±6	793±16	604±2.0	0.311 2±0.000 5	23 212±50	23 150±50
WX40D-2	50.5	4 087±3	339±8	559±1.8	0.329 8±0.000 4	25 559±50	25 497±50
WX40D-3	54.0	6 301±5	311±8	554±1.8	0.331 0±0.000 4	25 747±47	25 686±47
WX40D-4	73.0	4 178±3	619±13	531±1.7	0.339 5±0.000 4	26 944±51	26 881±51
WX40D-5	79.0	2 143±2	504±11	525±2.1	0.350 1±0.0005	28 022±65	27 958±65
WX40D-6	99.5	4 890±3	740±16	612±1.8	0.374 5±0.000 5	28 360±55	28 297±55
注：λ₂₃₀=9.157 7×10^-6 a^-1，λ₂₃₄=2.826 3×10^-6 a^-1，λ₂₃₈=1.551 25×10^-10 a^-1；δ²³⁴U=([²³⁴U/²³⁸U]_活度比-1)×1 000，δ²³⁴U初始值根据²³⁰Th年龄(T)计算获得，即δ²³⁴U初始值= δ²³⁴U测量值×e^{234× T}；²³⁰Th年龄的校正值是假设初始²³⁰Th/²³²Th原子比为(4.4±2.2)×10^-6.

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