Dating a 109.9 m ice core from Dome A (East Antarctica) with volcanic records and a firn densification model
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- 作者：ChuanJin Li (1)
CunDe Xiao (1)
ShuGui Hou (1) (2)
JiaWen Ren (1)
MingHu Ding (1) (3)
Rui Guo (4) - 关键词：Eastern Antarctic ice sheet ; Dome A ; volcanic events ; ice core dating
- 刊名：Science China Earth Sciences
- 出版年：2012
- 出版时间：August 2012
- 年：2012
- 卷：55
- 期：8
- 页码：1280-1288
- 全文大小：675KB
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CunDe Xiao (1)
ShuGui Hou (1) (2)
JiaWen Ren (1)
MingHu Ding (1) (3)
Rui Guo (4)
1. The State Key Laboratory of the Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China
2. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, 210093, China
3. Chinese Academy of Meteorological Sciences, Beijing, 100081, China
4. Alashan Desert Eco-Hydrology Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China - ISSN：1869-1897
文摘
A 109.9 m ice core was extracted at a location about 300 m away from the Dome A summit (80°00′S, 77°21″E) by the Chinese team of the International Trans-Antarctic Science Expedition (ITASE) during the 21st Chinese National Antarctica Research Expedition (CHINARE) in January 2005. Two independent methods were used for dating the ice core, volcanic event markers shown by prominent non-sea-salt sulfate (nss-SO4 2?/sup>) and the Herron and Langway (H-L) firn densification model. Six prominent volcanic events (Agung 1963 AD, Tambora 1815 AD, Kuwae 1453 AD, Unknown 1259 AD, Taupo 186 AD and Pinatubo 1050 BC) were identified by comparison with other Antarctic ice cores. Based on the mean accumulation rates between adjacent events, we estimate the age at the firn pore close-off depth (102 m) was 3516±100 a BP. This is the oldest close-off age ever reported from the Antarctic and the Greenland ice sheets. Calculations using the H-L model show that the age at the same depth is 3581±100 a BP. The two dating techniques differ by 65 years, or ?.8% of the record. We calculated the bottom age of the ice core as 4009±150 a BP using the volcanic dating method and 4115±150 a BP using the H-L model method.