Distribution of Shallow Isochronous Layers in East Antarctica Inferred from Frequency-Modulated Continuous-Wave (FMCW) Radar

Wangxiao Yang, Yinke Dou, Shinan Lang, Jingxue Guo, Yao Pan, Yan Chen

Abstract


During the 32nd Chinese National Antarctic Research Expedition (CHINARE 32), we used shallow ice radar within the East Antarctic region extending from Zhongshan Station to Kunlun Station and obtained the distribution of shallow isochronous layers for the first time. Taking a typical area as a case study, this article describes the complete workflow used in radar data processing, including the extraction of isochronous layers. Moreover, information on the depths of the isochronous layers is obtained by referring to ice core data. The results show the large-scale distribution of shallow isochronous layers in East Antarctica. Moreover, the isochronous layers formed in specific years can be traced. During the analysis, it is found that the isochronous layers sometimes display sharp slopes. We also present several maps of the shallow isochronous layers within three selected regions, including a region surrounding Dome A, a region 100 km away from Dome A and a region corresponding to the Lambert Glacier, and we show the large-scale distribution of the layers and detailed depth information for each layer. Comparing the maps of the isochronous layers within the three regions shows that the isochronous layers are relatively stable in the Dome A region and change more intensely in the Lambert Glacier region and that sharper slopes occur frequently in areas close to Dome A. The analysis of the distribution of the shallow isochronous layers and age-depth information from different regions provides important data that support the calculation of large-scale accumulation rates in the Antarctic region.


Keywords


frequency-modulated continuous-wave (FMCW) radar; shallow isochronous layers; specific years; depth information.

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References


DOI: https://doi.org/10.4401/ag-7794
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X