Accumulation rates in Dronning Maud Land, Antarctica, as revealed by dielectric-profiling measurements of shallow firn cores
Accumulation rates in Dronning Maud Land, Antarctica, as revealed by dielectric-profiling measurements of shallow firn cores
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DOI：
10.3189/172756400781820705
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发表时间：
2000
影响因子：
2.9
通讯作者：
H. Oerter;F. Wilhelms;F. Jung-Rothenhäusler;F. Göktas;Heinrich Miller;W. Graf;Stefan Sommer
中科院分区：
文献类型：
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作者：
H. Oerter;F. Wilhelms;F. Jung-Rothenhäusler;F. Göktas;Heinrich Miller;W. Graf;Stefan Sommer
欧洲南极冰取芯计划包括对南极洲Dronning Maud地内陆冰高原进行全面的现场前调查。1997/98年野外季节的德国冰川学方案是在阿蒙森森沿一条1200公里的横断面进行的，其中包括在坑中和用浅冰芯取样积雪。本文着重于积累研究。通过介质剖面和连续流分析对岩心进行了测年。剖面中明显的火山活动高峰和季节信号有助于建立深度时间尺度。喀拉喀托火山、坦博拉火山（一个不知名的火山）、Kuwae火山和El Chichon火山的喷发都在冰中得到了充分的记录。从深度时间尺度上推断了不同时期积累速率的变化。将12个年分解记录叠加，得到了近200年累积速率的综合记录。据此，积累率在19世纪下降，在20世纪上升。最近的价值绝不是特别的，因为它们没有超过19世纪初的价值。积累速率的变化很可能与Amundsenisen δ18O记录显示的温度变化有关。
Abstract The European Programme for Ice Coring in Antarctica includes a comprehensive pre-site survey on the inland ice plateau of Dronning Maud Land, Antarctica. The German glaciological programme during the 1997/98 field season was carried out along a 1200 km traverse on Amundsenisen and involved sampling the snow cover in pits and by shallow firn cores. This paper focuses on the accumulation studies. The cores were dated by dielectric-profiling and continuous-flow analysis. Distinct volcanogenic peaks and seasonal signals in the profiles served to establish a depth time-scale. The eruptions of Krakatoa, Tambora, an unknown volcano, Kuwae and El Chichon are well-documented in the ice. Variations of the accumulation rates over different times were inferred from the depth time-scales. A composite record of accumulation rates for the last 200 years was produced by stacking 12 annually resolved records. According to this, accumulation rates decreased in the 19th century and increased in the 20th century. The recent values are by no means extraordinary, as they do not exceed the values at the beginning of the 19th century. Variations in accumulation rates are most probably linked to temperature variations indicated in δ18O records from Amundsenisen.