Spatio-temporal variability of past accumulation rates inferred from isochronous layers at Dome A, East Antarctica
Spatio-temporal variability of past accumulation rates inferred from isochronous layers at Dome A, East Antarctica
复制标题
DOI：
10.1017/aog.2016.28
复制
发表时间：
2016-08
影响因子：
2.9
通讯作者：
Tiantian Wang;Bo Sun;Xueyuan Tang;X. Pang;X. Cui;Jingxue Guo;Hui Wang
中科院分区：
文献类型：
--
作者：
Tiantian Wang;Bo Sun;Xueyuan Tang;X. Pang;X. Cui;Jingxue Guo;Hui Wang
摘要南极洲东部冰穹A的古积累速率研究完全缺乏。本文利用中国极地研究所（PRIC）第21次南极考察期间收集的无线电回波探测（RES）资料，计算了近161 ka以来海冰累积速率的时空变化。通过将这些层与东方冰芯沿着RES剖面的位置联系起来来确定这些层的年代，RES剖面是由阿尔弗雷德-韦格纳研究所（AWI）在东南极洲圆顶连接（DoCo）项目中飞行的。Dansgaard-Johnsen模型被用来确定冰穹A地区的冰积累的空间和时间模式。结果表明，沿着Dome A 216 km的雷达剖面，冰堆积从南到北沿着略有增加。最低的冰积累率计算周围的圆顶A区。在过去~90 ka，在Dome A的34-47 ka（海洋同位素第3阶段）期间有相对较高的积累速率。
ABSTRACT Studies of palaeo-accumulation rates at Dome A, East Antarctica, are entirely absent. Here, spatio-temporal variations in ice accumulation rates for the past ~161 ka are calculated from isochronous internal layering, traced from radio-echo sounding (RES) data collected by the Polar Research Institute of China (PRIC) during the 21st CHINARE. The layers are dated by linking them to the site of Vostok ice core along an RES profile, which was flown by the Alfred-Wegener-Institut (AWI) in the Dome Connection East Antarctica (DoCo) project. The Dansgaard-Johnsen model is used to determine the spatial and temporal pattern of ice accumulation in Dome A region. The results show that there is a slight increasing pattern of ice accumulation from south to north along the 216 km radar profile at Dome A. The lowest ice accumulation rates were calculated around the Dome A zone. In the past ~90 ka, there were relatively high accumulation rates during the time period 34–47 ka (Marine Isotope Stage 3) at Dome A.