Geophysical survey at Talos Dome, East Antarctica: the search for a new deep-drilling site
Geophysical survey at Talos Dome, East Antarctica: the search for a new deep-drilling site
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DOI：
10.3189/172756404781814591
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发表时间：
2004-01-01
期刊：
影响因子：
--
通讯作者：
Zirizzottl, A
中科院分区：
文献类型：
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作者：
Frezzotti, M;Bitelli, G;Zirizzottl, A
塔罗斯冰穹是东南极高原边缘的一个冰穹;由于这里的堆积比东南极其他冰穹更高，冰保存了良好的地球化学和古气候记录。塔罗斯圆顶地区的新地图使用全球定位系统（GPS）定位圆顶峰会（南纬72度47' 14 "，东经159度04' 2";海拔2318.5米（WGS 84））。使用GPS测量了由九个桩组成的表面应变网络。数据表明，最接近山顶的木桩以每平方厘米（-1）的速度向东南偏南移动。其他桩，位于8公里外，移动高达0.33米a（-1）。机载雷达测量表明，塔罗斯穹顶的基岩海拔约为400米，覆盖着约1900米厚的冰。积雪雷达和全球定位系统调查显示，山顶地区（半径115公里）的内部分层是连续和水平的。雪雷达层的深度分布分析表明，积累减少了圆顶的顺风（东北偏北）和增加逆风（西南偏南）。在过去的500年中，圆顶的古形态发生了变化，这可能是由于风升华导致积雪空间分布的变化。为了计算塔罗斯穹的初步年龄与深度剖面，制定了一个简单的一维稳态模型。该模型预测，基岩以上100米的冰可能覆盖一个冰期-间冰期。
Talos Dome is an ice dome on the edge of the East Antarctic plateau; because accumulation is higher here than in other domes of East Antarctica, the ice preserves a good geochemical and palaeoclimatic record. A new map of the Talos Dome area locates the dome summit using the global positioning system (GPS) (72 degrees 47' 14 '' S, 159 degrees 04' 2 '' E; 2318.5 m elevation (WGS84)). A surface strain network of nine stakes was measured using GPS. Data indicate that the stake closest to the summit moves south-southeast at a few cm a(-1). The other stakes, located 8 km away, move up to 0.33 m a(-1). Airborne radar measurements indicate that the bedrock at the Talos Dome summit is about 400 m in elevation, and that it is covered by about 1900 rn of ice. Snow radar and GPS surveys show that internal layering is continuous and horizontal in the summit area (115 km radius). The depth distribution analysis of snow radar layers reveals that accumulation decreases downwind of the dome (north-northeast) and increases upwind (south-southwest). The palaeomorphology of the dome has changed during the past 500 years, probably due to variation in spatial distribution of snow accumulation, driven by wind sublimation. In order to calculate a preliminary age vs depth profile for Talos Dome, a simple one-dimensional steady-state model was formulated. This model predicts that the ice 100 m above the bedrock may cover one glacial-interglacial period.