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A possible Younger Dryas-type event during Asian monsoonal Termination 3

science china Earth sciences 2006年第9期49卷 982-990页

作者： chen shitao1, wang yongjin1, kong xinggong1, liu dianbing1, cheng hai2.& r.l. edwards2.1. college of geography science, nanjing normal university, jiangsu key laboratory of environmental change and ecological construction, nanjing 2.0097, china 2. Department of Geology and Geophysics, university of Minnesota, Minneapolis MN55455, USA 1. college of geography science Nanjing Normal University Jiangsu Key Laboratory of Environmental Change and Ecological Construction Nanjing 210097 China 2. Department of Geology and Geophysics University of Minnesota Minneapolis MN 55455 USA

Seven U-Th dates, 560 δ 18O data and microscopic sequences were measured for sta- lagmites from two high-altitude caves in Shennongjia area, Hubei Province. Variations of the de- cadal-resolution stalagmite δ 18O record from Swan Cave (1600 m elevation) reflect large spatial changes in circulation strength and precipitation of Asian monsoon. The evidence comes from a great similarity among the stalagmite δ 18O records from nanjing, jiangsu Province; libo, Guizhou Province and here studied area during the last deglaciation, including a part interval of Younger-Dryas event and Bolling-Allerod. A 30-year-resolution stalagmite δ 18O record from Yongxing Cave (1400 m eleva- tion), 70 km away from Swan Cave, reveals a rapid transition of Asian monsoon climate during Ter- mination 3 at about 245±5 kaBP. Based on 3 U-Th dates and about 5000 continuous annual bands, a millennial dry episode has been observed during Asian monsoonal Termination 3 from the Yongxing δ 18O profile. With respect to its structure, duration and transition, the dry reversal, as indicated by our stalagmite δ 18O record, gener.l.y agrees with the pattern of the YD event well-expressed in the Chi- nese stalagmite δ 18O records. This YD-type event is characterized by a large decrease in δ 18O value as much as 2.30‰, more than half of the δ 18O excursion between glacial/inter.l.cial periods, and lasts 1371±59 a determined by the annual counting chronology. After this event, the monsoon climate shifted abruptly into the inter.l.cial period within 74±4 a. Our data corroborate the view that the re- peated occurrence of YD-type event was not an “accident”, possibly resulted from the coupling of ice-sheet and oceanic/atmospheric circulations.

关键词： stalagmite, Termination 3, Asian monsoon, YD-type event, Shennongjia, Hubei Province.

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High-resolution stalagmite δ13C record of soil processes from southwestern china during the early MIS 3

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Chinese science Bulletin 2013年第7期58卷 796-802页

作者： liu dianbing wang yongjin cheng hai edwards r l college of geography science Nanjing Normal University Institute of Global environmental change Xi'an Jiaotong University Department of Geology and Geophysics University of MinnesotaMinneapolis

Knowledge of the evolution of pedogenic processes in the carbonate area is important to understand the dynamics of rock desertification.A precisely-dated stalagmite δ13C record between 61.3 and 50.5 ka BP from southwestern china,potentially r.l.ted to soil biogenic CO2 production,shifts within a narrow range between -9‰ and -7‰,and exhibits a prominent cycle of 350-470 a,independent of the Asian monsoon *** indicates that a threshold effect might contr.l.the amplitude of calcite δ13C variability,likely associated with the vertical soil loss in the carbonate *** periodic δ13C changes reflect that the loss/recovery of soil cover can operate on centennial ***,the rock desertification in southwestern china might at least initiate 60 ka ago and should be of natur.l.origin.

关键词： Wulu 洞石笋稳定的碳同位素一百年的变化玷污过程

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High-resolution stalagmite δ^(13)C record of soil processes from southwestern china during the early MIS 3

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science china(Technological sciences) 2013年第3期56卷 796-802页

关键词： Wulu Cave stalagmites stable carbon isotope centennial changes soil processes

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东亚季风MIS3早期DO事件的亚旋回及全球意义

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第四纪研究 2008年第1期28卷 169-176页

作者：刘殿兵汪永进陈仕涛程海 r.l.edwards 南京师范大学地理科学学院南京210097 Department of Geology and Geophysics University of Minnesota Minneapolis MN 55455 USA

根据湖北永兴洞石笋（YX51）10个U／Th年龄，470组氧、碳同位素数据建立了深海氧同位素3阶段（MIS3）早期57．7～35．6kaB．P．期间东亚夏季风演化时间序列。在发育时段，千年尺度δ^18O峰谷变化与高纬冰芯记录的Dansgaard-Oeschger（D... 详细信息

根据湖北永兴洞石笋（YX51）10个U／Th年龄，470组氧、碳同位素数据建立了深海氧同位素3阶段（MIS3）早期57．7～35．6kaB．P．期间东亚夏季风演化时间序列。在发育时段，千年尺度δ^18O峰谷变化与高纬冰芯记录的Dansgaard-Oeschger（D0）事件一致；δ^18C呈现出与δ^18O正相关同步演化特征，但受区域环境影响，在事件内部细节上存在差异。区域对比表明，同一季风区的永兴洞和葫芦洞石笋δ^18O指示的季风降水同位素组成具有本质上一致性；高低纬记录对比显示，千年尺度的峰谷变化一一对应，反映热带辐合带（ITCZ）水汽传输能力、平均位置变化对东亚季风和高北纬气候具有重要影响。在DO13至DO15事件内部，永兴洞石笋δ^18O记录了显著的双峰特征，说明低纬季风强度变化和格陵兰冰芯δ^18O揭示的次级暖峰具有一致对应关系，指示大气快速传输机制在高低纬环境突变中起着重要作用。

关键词： MIS 3阶段石笋 DO事件亚旋回

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