MIS3以来黄土高原东南部石笋阶段性沉积记录的夏季风演化

董进国; 董梦彩; 熬贵福; 黄姜楠

doi:10.16562/j.cnki.0256-1492.2018.05.016

MIS3以来黄土高原东南部石笋阶段性沉积记录的夏季风演化

南通大学地理科学学院，南通 226007

基金项目:
国家自然科学基金项目“黄土高原末次冰期以来气候变化模式及突变事件的高分辨率石笋记录研究”(41472317)；江苏省高校优秀中青年教师和校长境外研修计划

详细信息

作者简介: 董进国(1978—)，男，副教授，第四纪年代学与环境演变专业，E-mail：dongjinguo1111@163.com

中图分类号: P534.63

蔡秋蓉编辑

收稿日期: 2017-06-19

修回日期: 2018-01-23

刊出日期: 2018-10-28

Variation of East Asian summer monsoon since MIS3 recorded by an absolutely-dated stalagmite from north China

College of Geography Science, Nantong University, Nantong 226007, China

Received Date: 19 June 2017

Revised Date: 23 January 2018

Publish Date: 28 October 2018

摘要

摘要:
基于山西龙洞8个铀钍年代和100个氧同位素数据(δ¹⁸O)重建了深海氧同位素(MIS)3阶段以来东亚夏季风演化历史。石笋L8沉积并不连续，主要生长在58.0~54.5, 27.1~18.0和6.8~3.9kaBP 3个阶段。不同于季风边缘区其他洞穴记录，石笋δ¹⁸O值在24.5kaBP突然增加1‰，表明MIS2早期内陆地区经历了一次显著的弱季风过程，可能响应于北大西洋Heinrich 2事件。石笋δ¹⁸O序列伴随着轨道尺度太阳辐射的变化，晚全新世δ¹⁸O值持续偏重意味着低纬热带辐合带逐步南移，导致北方地区夏季风降水持续减少。Dansgaard-Oeschger(D-O)15事件具有明显的双峰结构，与格陵兰冰心记录的亚千年尺度温度波动几乎同步变化。
- 黄土高原 /
- 石笋 /
- DO 15事件 /
- H2事件
Abstract:
The high-resolution oxygen isotope sequence established upon 100 oxygen isotope samples and 8 ²³⁰Th dates from the Dragon Cave, Shanxi province, north China, provides a detailed history of East Asian summer monsoon (EASM) variation since Marine Isotope Stages (MIS) 3. The sample L8 grew discontinuously during the periods from 58.0 to 54.5 kaBP, 27.1 to 18.0 kaBP, 6.8 to 3.9 kaBP, respectively. On the orbital scale, the long-term trend of the δ¹⁸O record generally follow the North Hemisphere Insolation changes. However, the L8 δ¹⁸O value abruptly increased by 1‰ at 24.5 kaBP, indicating an abrupt weak monsoon event possibly associated with the Heinrich event 2 in the North Atlantic region. Moreover, gradual enrichment of δ¹⁸O since ~ 6 kaBP also indicates steadily weakening of EASM, responding to southward retreat of the Intertropical Convergence Zone. During the early MIS3, our record shows two millennial-scale strong summer events, analogous in timing and structure to the Greenland Dansgaard-Oeschger events 16-15. The latter event (DO15) exhibits two distinct phases, consistent with the centennial shifts in Greenland temperature changes. This relationship reveals a tight coupling between high- and low-latitude climates at sub-millennial scales, implying a role of the large-scale ocean- atmosphere circulation in linking Greenland temperature and the Asian monsoon.
- Loess Plateau /
- stalagmite /
- Dansgaard-Oeschger 15 event /
- Heinrich event 2

HTML全文

图 1 山西龙洞石笋年龄-深度与岩心图

Figure 1.

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图 2 山西龙洞(黑色)和江苏葫芦洞(灰色)石笋δ¹⁸O记录对比

Figure 2.

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图 3 山西龙洞、江苏葫芦洞、贵州雾露洞和格陵兰NGRIP冰心δ¹⁸O记录对比

Figure 3.

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表 1 石笋L8的ICP-MS测年结果

Table 1. The results of ICP-MS ²³⁰Th dating for stalagmite L8

样品号-深度	²³⁸U ×10^-9	²³²Th ×10^-12	²³⁴U测量值^a	[²³⁰Th/²³⁸U]活度比^c	未校正年龄(aBP)	校正年龄(aBP)^{c, d}	δ²³⁴Uinitial校正初始值^b
L8-3	621±1	70±5	3718±6.0	0.1693±0.0008	3905±19	3905±19	3760±6
L8-20	492±1	2897±19	3716±12	0.2455±0.0016	5730±41	5679±44	3777±12
L8-26	476±1	1540±6	3701±4	0.2886±0.0013	6794±33	6776±34	3773±5
L8-36	1194±2	51±5	3528±7	0.7362±0.0016	18861±54	18859±54	3722±7
L8-52	1614±2	238±7	3522.8±6	0.8688±0.0020	22580±64	22579±64	3755±6
L8-71	903±1	87±4	3491.2±5	1.0168±0.0019	27027±67	27027±67	3769±6
L8-79	2117±4	208±18	2997.0±8	1.6756±0.0038	55079±201	55079±201	3502±9
L8-92	1177±12	68±5	2959.7±6	1.7070±0.0036	57015±177	57013±177	3477±7
注：a.δ²³⁴U=([δ²³⁴U/δ²³⁸U]_activity-1)x1000;b.δ²³⁴U_initial校正初始值计算是依据公式δ²³⁴U_initial=δ²³⁴U_measured×e^λ234*T; T是校正年龄; c.[²³⁰Th/²³⁸U]活度计算为[²³⁰Th/²³⁸U]_activity=1-e^-λ230T+(δ²³⁴U_measured/1000)[λ₂₃₀/(λ₂₃₀-λ₂₃₄)](1-e^{-(λ230-λ234)T}); ²³⁰Th, ²³⁴U, 及²³⁸U半衰期沿用Shen等的使用值^[10]; d.校正年龄假设的初始²³⁰Th/²³²Th原子数比值为4±2×10^-6; 年龄(aBP)以相对公元1950年表示

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MIS3以来黄土高原东南部石笋阶段性沉积记录的夏季风演化

南通大学地理科学学院，南通 226007

作者简介: 董进国(1978—)，男，副教授，第四纪年代学与环境演变专业，E-mail：dongjinguo1111@163.com

蔡秋蓉编辑

Variation of East Asian summer monsoon since MIS3 recorded by an absolutely-dated stalagmite from north China

College of Geography Science, Nantong University, Nantong 226007, China

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