Deep Radiostratigraphy Constraints Support the Presence of Persistent Wind Scouring Behavior for More Than 100 Ka in the East Antarctic Ice Sheet
Deep Radiostratigraphy Constraints Support the Presence of Persistent Wind Scouring Behavior for More Than 100 Ka in the East Antarctic Ice Sheet
复制标题
深层放射地层学约束支持南极东部冰盖存在超过 100 ka 的持续风冲刷行为
DOI：
10.1109/tgrs.2022.3209543
复制
发表时间：
2022
影响因子：
8.2
通讯作者：
Bo Sun
中科院分区：
文献类型：
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作者：
Kun Luo;Xueyuan Tang;Sixin Liu;Jingxue Guo;Jamin S. Greenbaum;Lin Li;Bo Sun
南极冰盖（AIS）风蚀区域不整合面的表征对于准确估计南极物质平衡非常重要，并且可以为气候模型提供约束。在这里，我们利用中国国家南极科考队在东南极洲Dome A区域附近收集的雷达数据追踪了6个等时内反射层。我们使用不同的透冰雷达，通过对来自几个南方夏季活动的数据进行交叉验证，确定了 39 个不整合面，并绘制了冰面以下 500 m 的冰川地层图。通过使用沿当地冰流线的一维冰流模型估算埋藏不整合面的侵蚀时间，我们确定了 10000 年规模的持续风蚀区域。我们通过对雷达图像的解释确定了最早的截断气候记录，并发现侵蚀活动可以追溯到距今大约 10 万年前；我们在这里展示的所有持续的风冲刷行为都开始于末次间冰期-末次冰期（128-10 ka B.P.）。高分辨率记录，例如揭示与侵蚀相关的冰川不整合面和冰川结构特征的记录，有助于提高对更新世晚期气候变化和冰盖动态的了解。
The characterization of unconformities in wind-scoured areas of the Antarctic ice sheet (AIS) is important for the accurate estimation of Antarctic mass balance and can provide constraints on climate models. Here, we apply radar data collected by the Chinese National Antarctic Research Expedition in the vicinity of the Dome A region in East Antarctica to trace six isochronous internal reflecting horizons. We identify 39 unconformities and map englacial stratigraphy 500 m below the ice surface through cross validation among the data from several austral summer campaigns using different ice-penetrating radars. By estimating erosion time of buried unconformities using a 1-D ice-flow model along local ice flowlines, we identify persistent wind-scoured zones on the scale of 10000 years. We identify the earliest truncated climatic record through interpretation of the radar images and find that erosional activity can be dated back to approximately 100000 years before present; all of the persistent wind scouring behaviors we present here began during the last interglacial–last glacial (128–10 ka B.P.). High-resolution records, such as this that reveal englacial unconformities and englacial structural characteristics associated with erosion, contribute to improved understanding of climate variability and ice sheet dynamics during the late Pleistocene.
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DOI：
10.5194/isprs-archives-xliii-b3-2021-449-2021
发表时间：
2021
期刊：
--
影响因子：
--
作者：
X. Cui;S. Lang;L. Li;B. Sun
通讯作者：
X. Cui;S. Lang;L. Li;B. Sun
影响因子：
2.9
作者：
M. Albert;C. Shuman;Z. Courville;R. Bauer;M. Fahnestock;T. Scambos
通讯作者：
M. Albert;C. Shuman;Z. Courville;R. Bauer;M. Fahnestock;T. Scambos
影响因子：
2.9
作者：
B. Welch;R. Jacobel
通讯作者：
B. Welch;R. Jacobel
影响因子：
11.4
作者：
X. Cui;H. Jeofry;J. Greenbaum;Jingxue Guo;Lin Li;L. Lindzey;F. Habbal;Wei Wei-Wei;D. Young;N. Ross;M. Morlighem;Lenneke M. Jong;J. Roberts;D. Blankenship;S. Bo;M. Siegert
通讯作者：
X. Cui;H. Jeofry;J. Greenbaum;Jingxue Guo;Lin Li;L. Lindzey;F. Habbal;Wei Wei-Wei;D. Young;N. Ross;M. Morlighem;Lenneke M. Jong;J. Roberts;D. Blankenship;S. Bo;M. Siegert
影响因子：
18.3
作者：
Indrani DasH;R. Bell;T. Scambos;M. Wolovick;T. Creyts;M. Studinger;N. Frearson;J. Nicolas;J. Lenaerts;M. Broeke
通讯作者：
Indrani DasH;R. Bell;T. Scambos;M. Wolovick;T. Creyts;M. Studinger;N. Frearson;J. Nicolas;J. Lenaerts;M. Broeke