干旱区生态环境知识资源中心(Arid): 过去3000年季风降水变化与突变事件的洞穴石笋记录对比

Arid

	过去3000年季风降水变化与突变事件的洞穴石笋记录对比
其他题名	Summer monsoon precipitation variations and abrupt climate events during the 3000 years: records from stalagmites in China
	董进国
来源期刊	干旱区资源与环境
ISSN	1003-7578
出版年	2012
卷号	26 期号:11 页码:36-41
中文摘要	基于辽宁省暖和洞2支石笋6个~(230)Th年龄与190个delta~(18)O数据,建立了晚全新世3500~200a B. P.东亚季风降水序列。3个百年尺度的弱季风事件已被证实:2800-2600、1500-1200和400-200a B. P.,其与北大西洋冰漂碎屑事件在发生时间上具有较好的一致性。与内陆高精度、高分辨率石笋delta~(18)O记录对比结果显示:1)轨道-千年尺度季风降水长期趋势变化相一致;2)百年-数十年尺度上季风降水具有明显的区域性,如距今1200-500 a B. P.,东北地区降水逐渐增加,西部干旱-半干旱地区降水逐渐减少,长江中下游以及南方地区降水变化趋势不明显。太阳活动与北大西洋气候波动可能对百年尺度东亚夏季风的强弱变化施加了重要影响。
英文摘要	We developed a composite oxygen isotopic record of cave calcite for the last 3500 years based on two stalagmites from the Nuanhe Cave in eastern Liaoning province, northeastern China. Replication of the stalagmite delta~(18)O from several caves in all contemporaneous growth intervals shows the kinetic fractionation was negligible and the delta~(18)O shifts were primarily caused by regional climate change. We interpreted our record in terms of meteoric precipitation changes, hence the variability of East Asian Monsoon intensity. Three internals of low precipitation were inferred in 2800-2600 y B. P., 1500-1200y B.P. and 400-200 y B. P., which correlated well with North Atlantic drift ice events. A comparison with other high-resolution and high-precise speleothem records from different climate regions indicates: (1) On orbital-millennial scale it indeed displayed similar long-trend change of monsoon precipitation. (2) However, regional differences in monsoon precipitation occurred along the latitudinal transect from 25°N to 41°N on centennial-to decadal-scale. For example, summer monsoon precipitation in the northeastern and northern China increased gradually during the 9-16th centuries, and oppose trends were found in arid and semiarid western China, and no obvious trends were found in mid-Yangtze River valley and southern China. Our study suggests that both solar activity and North Atlantic thermohaline circulation may have had important influence on Asian monsoon precipitation in China over the past 3500 years.
中文关键词	晚全新世 ; 石笋 ; 弱季风突变事件 ; 区域降水异同性
英文关键词	late Holocene Stalagmite weak-monsoon event regional difference in precipitation
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Geology
WOS研究方向	Geology
CSCD记录号	CSCD:4699658
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/228145
作者单位	董进国, 南通大学地理科学学院, 南通, 江苏 226007, 中国.
推荐引用方式 GB/T 7714	董进国. 过去3000年季风降水变化与突变事件的洞穴石笋记录对比[J],2012,26(11):36-41.
APA	董进国.(2012).过去3000年季风降水变化与突变事件的洞穴石笋记录对比.干旱区资源与环境,26(11),36-41.
MLA	董进国."过去3000年季风降水变化与突变事件的洞穴石笋记录对比".干旱区资源与环境 26.11(2012):36-41.

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