气候变化领域集成服务门户(CCPortal): 秦安地区全新世气候的周期振荡特征

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	秦安地区全新世气候的周期振荡特征
其他题名	Holocene Dry/Wet Fluctuations in Qin＇an, West Loess Plateau
	夏敦胜; 汤懋苍; 陈发虎
发表日期	2006
ISSN	1000-0240
卷号	28 期号:1 页码:70-75
中文摘要	通过对秦安大地湾8．3m天然黄土剖面高分辨率（约为150a）孢粉数据的研究，发现秦安地区孢粉数据与我国干旱、半干旱地区史料记载的旱涝演变有较为一致的变化，且有明显的冷干、暖湿的气候特征．奇异谱分析表明，秦安地区的旱涝变化有2300a、1060a、650a和390a的准振荡周期．准两千年周期与南亚季风的变化有密切的对应关系，也与太阳活动的强弱有关．
英文摘要	A pollen-spore record of an 8. 2 m-long loess section from Qin＇an （35.76°N, 105.82°E） in western Loess Plateau, one of the origins of Chinese civilization, was studied. It provides insights into monsoonal Climate change in this semiarid region, a climatologically sensitive region. The variations of pollen-spore concentration in Qin＇an .are closely related to centennial dry/wet fluctuations in semiarid regions of China in the recent 2 000 years. The abrupt drop of pollen-spore concentration around 3 200 a BP is also consistent with millennium scale dryness and environmental deterioration around 1150-1300 a BC revealed by document records. A singular spectrum analysis suggests that the dry/wet fluctuations in Qin＇an have 2 300 a, 1060 a, 650 a and 390 a periods. The 2 300 a cycle is well correlated to the variations of South Asian monsoon during the Holocene. When South Asian monsoon is strong, the western Loess Plateau is wet, and vice versa. The 2 300 a period is also related to solar variability.
关键词	全新世气候变化奇异谱分析秦安
英文关键词	Holocene;climate change;singular spectrum analysis;Qin＇an
语种	中文
WOS研究方向	Geology
WOS类目	GEOLOGY
CSCD记录号	CSCD:2315199
来源期刊	冰川冻土
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/1829
推荐引用方式 GB/T 7714	夏敦胜,汤懋苍,陈发虎. 秦安地区全新世气候的周期振荡特征[J]. 兰州大学, 中国科学院青藏高原研究所,2006,28(1):70-75.
APA	夏敦胜,汤懋苍,&陈发虎.(2006).秦安地区全新世气候的周期振荡特征.冰川冻土,28(1),70-75.
MLA	夏敦胜,et al."秦安地区全新世气候的周期振荡特征".冰川冻土 28.1(2006):70-75.