| A continuous 3000—year precipitation record of ENSO variability during LGM from a stalagmite in Nanjing |
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| 作者姓名： | KONGXinggong WANGYongjin WUJiangying CHENGHai |
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| 作者单位： | [1]CollegeofGeographicScience,NanjingNormalUniversity,Nanjing210097,China [2]DepartmentofEarthSciences,NanjingUniversity,Nanjing210093,China [3]MinnesotaIsotopeLab,UniversityofMinnesota,MN55455,USA |
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| 基金项目： | the National Natural Science Foundation of China (Grant No. 40225007) |
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| 摘 要： | A glacial stalagmite chronology from Nanjing has been established by the TIMS-U series dating and annual band counting methods. The annually layering sequence spanning the 3000-year period from 18179 to 14900 calendar years before the present (aBP) was analyzed for evidence of East Asian summer monsoon precipitation variability during the Last Glacial Maximum (LGM). Power spectral analysis of the sequence shows a distinct interannual (2—7 years) band of enhanced variability suggestive of El Ni駉-Southern Oscillation (ENSO) teleconnections into East China during the LGM when climatic boundary conditions were different from those of today. The lower frequency bands (4—7 years) variability becomes weaker from 18179 to 14900 aBP, sup-porting the precession forcing model. The reappearance of the ENSO band in the coldest climatic boundary conditions during the Heinrich Event 1, however, suggests the stimula-tion of the enhanced East Asia winter monsoon to the El Ni駉 events.
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| 关 键 词： | 古气候 石笋年代学 亚州东部 季风 厄尔尼诺事件 冰川作用极盛期 |
| 收稿时间： | 2002-11-03 |
A continuous 3000-year precipitation record of ENSO variability during LGM from a stalagmite in Nanjing |
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| KONGXinggong WANGYongjin WUJiangying CHENGHai.A continuous 3000-year precipitation record of ENSO variability during LGM from a stalagmite in Nanjing[J].Chinese Science Bulletin,2003,48(5):480-484. |
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| Authors: | Xinggong Kong Yongjin Wang Jiangying Wu Hai Cheng |
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| Institution: | KONG Xinggong1, WANG Yongjin1, WU Jiangying2 & CHENG Hai3 1. College of Geographic Science, Nanjing Normal University, Nanjing 210097, China; 2. Department of Earth Sciences, Nanjing University, Nanjing 210093, China; 3. Minnesota Isotope Lab, University of Minnesota, MN 55455, USA |
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| Abstract: | A glacial stalagmite chronology from Nanjing has been established by the TIMS-U series dating and annual band counting methods. The annually layering sequence spanning the 3000-year period from 18179 to 14900 calendar years before the present (aBP) was analyzed for evidence of East Asian summer monsoon precipitation variability during the Last Glacial Maximum (LGM). Power spectral analysis of the sequence shows a distinct interannual (2-7 years) band of enhanced variability suggestive of El Nino-Southern Oscillation (ENSO) teleconnections into East China during the LGM when climatic boundary conditions were different from those of today. The lower frequency bands (4-7 years) variability becomes weaker from 18179 to 14900 aBP, supporting the precession forcing model. The reappearance of the ENSO band in the coldest climatic boundary conditions during the Heinrich Event 1, however, suggests the stimulation of the enhanced East Asia winter monsoon to the El Nino events. |
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| Keywords: | Last Glacial Maximum ENSO East Asia monsoon cave stalagmite |
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