黄土高原东缘晚全新世高精度高分辨率石笋古环境记录

doi:10.13249/j.cnki.sgs.2012.09.1136

摘要/Abstract

摘要：

基于山西武乡太行龙洞一支石笋5个²³⁰Th年龄和190个氧同位素数据重建4 400~150 a B.P.高分辨率δ¹⁸O序列。石笋δ¹⁸O值逐渐增加,除最近约600 a外,在千年尺度长期趋势变化上与中国南部其它洞穴记录相一致,表明晚全新世亚洲夏季风强度持续减弱响应于同一驱动机制。一次显著的气候突变事件发生在2 550~2 000 a B.P.,与史料记载的干旱期大致相对应。功率谱分析揭示出106 a周期,与树轮Δ¹⁴C太阳活动周期大体一致,说明百年尺度上太阳活动与东亚季风变化有一定关联性。

关键词: 晚全新世, 石笋, 东亚季风, 突变事件, 黄土高原东缘, 太阳活动

Abstract:

The Dragon Cave (38°46´N, 113°16´E) is located at transition between semi-humid and semi-arid areas in the middle temperature zone of China. Here, mean annual temperature is 8ºC. Mean annual rainfall is 530mm and about 87% of annual precipitation falls in May-October. Dragon Cave is >600m long with an elevation of 1400m on the western slope of Taihang Mountain, near the eastern edge of Chinese Loess Plateau. Stalagmite L1 was collected 200m from the cave entrance in December 2010. It is about 200mm like a candle. A total of 5 sub-samples were measured by an inductively Multi-collection coupled plasma mass spectrometry on a Finnigan-NEPTUNE in the High-precision Mass Spectrometry and Environment Chang Laboratory, Department of Geosciences, National Taiwan University. The uncertainty of reported age is ± 2σ. A high-resolution oxygen isotope profile established with 190 oxygen isotope data, provides a continuous history of East Asian summer monsoon intensity for the period of 4400-150a B.P. (before AD1950). With a relatively stable boundary condition, we interpret the δ¹⁸O of speleothem calcite as most indicative of the amount of summer monsoon precipitation, although temperature and other factors might have some minor impact. Comparison of the record with previous published contemporaneous China stalagmite records shows that all δ¹⁸O records, characterized with increasing δ¹⁸O and declining summer monsoon precipitation trends over the late Holocene, generally follow insolation changes on millennial timescale. This long-term agreement supports that the solar insolation is the primary factor driving Asian summer monsoon. An unusual abrupt weak summer monsoon at 2550-2000a B.P. indicates a mega-drought event, supported by historic archives. The spectral analysis of δ¹⁸O time series yields a solar activity-related 106-yr periodicity. However, comparing to a weak solar activity at 2.7ka B.P., a 100-200-yr lag of the cave-inferred mega-drought event implies a complicated mechanism of short-term solar forcing on monsoon system.

Key words: late Holocene, stalagmite, weak monsoon event, Eastern Loess Plateau, solar activity

中图分类号:

P532

董进国, 沈川洲, 姜修洋. 黄土高原东缘晚全新世高精度高分辨率石笋古环境记录[J]. 地理科学, 2012, 32(9): 1136-1141.

Jin-guo DONG, Chuan-zhou SHEN, Xiu-yang JIANG. An Absolute-dated High-resolution Palaeoclimate Record Between 4 400 and 150 a B.P. from Dragon Cave, Eastern Loess Plateau, China[J]. SCIENTIA GEOGRAPHICA SINICA, 2012, 32(9): 1136-1141.

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样品号	²³²Th	²³⁸U	²³⁰Th/²³²Th	δ²³⁴U	²³⁰Th/²³⁸U	未校正年龄	校正年龄	δ²³⁴U_initial
	(×10^-¹²)	(×10^-⁹)	(×10^-¹²)^d	测量值^a	活度比^c	(a B.P.)	(a B.P.)^c,e	校正初始值^b
L1-3	191±8	393.4±0.7	196±9	1478±6	0.0058±0.0001	192±3	187±4	1479±6
L1-48	4288±17	452.6±0.8	68±1	1419±5	0.0391±0.0005	1715±24	1612±57	1426±5
L1-120	262±9	415.3±0.8	1530±55	1600±5	0.0584±0.0002	2415±11	2408±11	1611±5
L1-169	356±8	430.6±0.9	1368±31	1584±6	0.0685±0.0003	2865±13	2856 ±14	1597±6
L1-191	883±7	400.2±0.9	711±7	1572±9	0.0949±0.0005	4029±26	4006±28	1590±9

公元前（世纪）	7	6	5	4	3	2
D	13	15	7	1	1	14
F	6	6	2	5	8	15
D/(D+F)	0.68	0.71	0.77	0.17	0.11	0.48