气候变化领域集成服务门户(CCPortal): 高分辨率石笋记录的三峡库区小冰期气候变化

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	高分辨率石笋记录的三峡库区小冰期气候变化
其他题名	Climate Change During Little Ice Age with High-resolution Stalagmite Record in the Three-Gorges Reservoir Area
	杨勋林; 陈发虎; 袁道先; 程海; 张月明; 黄帆
发表日期	2013
ISSN	1000-0690
卷号	33 期号:5 页码:629-634
中文摘要	基于重庆水鸣洞石笋(NSM03)7个~(230)Th年代数据和438个delta~(18)O数据建立三峡库区1250~1750 A.D.时段分辨率约为1 a的delta~(18)O记录。分析显示石笋delta~(18)O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delta~(18)O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delta~(18)O序列具有显著树轮Delta~(14)C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。
英文摘要	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~(230)Th dates and 438 stable oxygen isotope ratios (delta~(18)O) 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 delta~(18)O 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 delta~(18)O 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. delta~(18)O value of the stalagmite fluctuated dramatically indicating that monsoon precipitation was in frequently fluctuate period. Spectral analysis showed NSM03 delta~(18)O 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 delta~(18)O 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.
关键词	石笋氧同位素亚洲季风小冰期三峡库区
英文关键词	stalagmite;delta~(18)O;LIA;Asian Monsoon;Three-Gorges reservoir area
语种	中文
WOS研究方向	Geology
WOS类目	GEOLOGY
CSCD记录号	CSCD:4843610
来源期刊	地理科学
来源机构	兰州大学 ; 中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/1594
推荐引用方式 GB/T 7714	杨勋林,陈发虎,袁道先,等. 高分辨率石笋记录的三峡库区小冰期气候变化[J]. 兰州大学, 中国科学院青藏高原研究所,2013,33(5):629-634.
APA	杨勋林,陈发虎,袁道先,程海,张月明,&黄帆.(2013).高分辨率石笋记录的三峡库区小冰期气候变化.地理科学,33(5),629-634.
MLA	杨勋林,et al."高分辨率石笋记录的三峡库区小冰期气候变化".地理科学 33.5(2013):629-634.