A detailed 2840 year record of explosive volcanism in a shallow ice core from Dome A, East Antarctica
A detailed 2840 year record of explosive volcanism in a shallow ice core from Dome A, East Antarctica
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DOI：
10.3189/2012jog11j138
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发表时间：
2012-02
影响因子：
3.4
通讯作者：
Su Jiang;J. Cole‐Dai;Yuansheng Li;D. Ferris;Hongmei Ma;C. An;G. Shi;Bo Sun
中科院分区：
文献类型：
--
作者：
Su Jiang;J. Cole‐Dai;Yuansheng Li;D. Ferris;Hongmei Ma;C. An;G. Shi;Bo Sun
摘要利用东南极DomeA冰芯（DA 2005冰芯）顶部109.91 m的100.42 m，重建了2840年来的火山活动史。利用两个已知的火山地层标志物，发现AD 1260-1964期间的平均累积速率为23.2 mmw.e.。a-1，与之前报告的Dome A的蓄积率一致。这一平均累积率被用来确定整个岩芯的年代。公元前840年至公元1998年期间的火山喷发被检测为突出的硫酸盐事件。78次喷发被确认，平均每世纪2.7次喷发。与以前的南极冰芯火山记录进行比较，以评估这个新的DA 2005记录的质量。在火山事件的日期方面，DA 2005记录与公元第二个千年（公元1000-1998年）的先前记录非常一致。在DA 2005记录和其他几个南极冰芯记录中发现的一系列火山特征在公元第一个千年（公元1-1000年）似乎证实了DA 2005记录在这一时期。对于较老的时期，由于缺乏年代明确的地层层位，DA 2005记录和其他南极冰芯记录之间的直接比较是困难的。
Abstract A detailed history of volcanism covering the last 2840 years is reconstructed from the top 100.42 m of a 109.91 m ice core from Dome A (DA2005 ice core), East Antarctica. Using two known volcanic stratigraphic markers, the mean accumulation rate during the period AD 1260-1964 is found to be 23.2 mmw.e. a-1, consistent with the previously reported accumulation rate at Dome A. This mean accumulation rate is used to date the entire core. Volcanic eruptions in the period 840 BC-AD1998 are detected as outstanding sulphate events. Seventy-eight eruptions are identified, with a mean of 2.7 eruptions per century. Comparisons with previous Antarctic ice-core volcanic records are made to assess the quality of this new DA2005 record. In terms of dates for volcanic events, the DA2005 record is in good agreement with previous records in the second millennium ad (ad 1000-1998). A series of volcanic signatures found in both the DA2005 record and several other Antarctic ice-core records in the first millennium ad (ad 1-1000) appear to validate the DA2005 record during this time period. For the older periods, direct comparisons are difficult between the DA2005 record and other Antarctic ice-core records due to the lack of well-dated stratigraphic horizons.