Radar-Derived Internal Structure and Basal Roughness Characterization along a Traverse from Zhongshan Station to Dome A, East Antarctica
The internal layers of ice sheets from ice-penetrating radar (IPR) investigation preserve critical information about the ice-flow field and englacial conditions. This paper presents a new detailed analysis of spatial distribution characteristics of internal layers and subglacial topography of the Ea...
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ftmdpi:oai:mdpi.com:/2072-4292/12/7/1079/ 2023-08-20T04:00:46+02:00 Radar-Derived Internal Structure and Basal Roughness Characterization along a Traverse from Zhongshan Station to Dome A, East Antarctica Kun Luo Sixin Liu Jingxue Guo Tiantian Wang Lin Li Xiangbin Cui Bo Sun Xueyuan Tang agris 2020-03-27 application/pdf https://doi.org/10.3390/rs12071079 EN eng Multidisciplinary Digital Publishing Institute Environmental Remote Sensing https://dx.doi.org/10.3390/rs12071079 https://creativecommons.org/licenses/by/4.0/ Remote Sensing; Volume 12; Issue 7; Pages: 1079 ice-penetrating radar (IPR) East Antarctica internal layering continuity index (ILCI) roughness ice dynamics Text 2020 ftmdpi https://doi.org/10.3390/rs12071079 2023-07-31T23:17:50Z The internal layers of ice sheets from ice-penetrating radar (IPR) investigation preserve critical information about the ice-flow field and englacial conditions. This paper presents a new detailed analysis of spatial distribution characteristics of internal layers and subglacial topography of the East Antarctic ice sheet (EAIS) from Zhongshan Station to Dome A. The radar data of 1244 km along a traverse between Zhongshan Station and Dome A of EAIS were collected during the 29th Chinese National Antarctic Research Expedition (CHINARE 29, 2012/2013). In this study, the Internal Layering Continuity Index (ILCI) and basal roughness were taken as indicators to provide an opportunity to evaluate the past internal environment and dynamics of the ice sheet. Except for the upstream of Lambert Glacier, the fold patterns of internal layers are basically similar to that of the bed topography. The relatively flat basal topography and the decrease of ILCI with increasing depth provide evidence for identifying previous rapid ice flow areas that are unavailable to satellites, especially in the upstream of Lambert Glacier. Continuous internal layers of Dome A, recording the spatial change of past ice accumulation and ice-flow history over 160 ka, almost extend to the bed, with high ILCI and high basal roughness of the corresponding bed topography. There are three kinds of basal roughness patterns along the traverse, that is, “low ξt low η”, “low ξt high η”, and “high ξt high η”, where ξt represents the amplitude of the undulations, and quantifies the vertical variation of the bedrock, and η measures the frequency variation of fluctuations and the horizontal irregularity of the profile. The characteristics of internal layers and basal topography of the traverse between Zhongshan Station and Dome A provide new information for understanding the ancient ice-flow activity and the historical evolution of EAIS. Text Antarc* Antarctic Antarctica East Antarctica Ice Sheet Lambert Glacier MDPI Open Access Publishing Antarctic East Antarctica East Antarctic Ice Sheet Lambert Glacier ENVELOPE(67.490,67.490,-73.065,-73.065) Zhongshan ENVELOPE(76.371,76.371,-69.373,-69.373) Zhongshan Station ENVELOPE(76.371,76.371,-69.373,-69.373) Remote Sensing 12 7 1079 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
ice-penetrating radar (IPR) East Antarctica internal layering continuity index (ILCI) roughness ice dynamics |
spellingShingle |
ice-penetrating radar (IPR) East Antarctica internal layering continuity index (ILCI) roughness ice dynamics Kun Luo Sixin Liu Jingxue Guo Tiantian Wang Lin Li Xiangbin Cui Bo Sun Xueyuan Tang Radar-Derived Internal Structure and Basal Roughness Characterization along a Traverse from Zhongshan Station to Dome A, East Antarctica |
topic_facet |
ice-penetrating radar (IPR) East Antarctica internal layering continuity index (ILCI) roughness ice dynamics |
description |
The internal layers of ice sheets from ice-penetrating radar (IPR) investigation preserve critical information about the ice-flow field and englacial conditions. This paper presents a new detailed analysis of spatial distribution characteristics of internal layers and subglacial topography of the East Antarctic ice sheet (EAIS) from Zhongshan Station to Dome A. The radar data of 1244 km along a traverse between Zhongshan Station and Dome A of EAIS were collected during the 29th Chinese National Antarctic Research Expedition (CHINARE 29, 2012/2013). In this study, the Internal Layering Continuity Index (ILCI) and basal roughness were taken as indicators to provide an opportunity to evaluate the past internal environment and dynamics of the ice sheet. Except for the upstream of Lambert Glacier, the fold patterns of internal layers are basically similar to that of the bed topography. The relatively flat basal topography and the decrease of ILCI with increasing depth provide evidence for identifying previous rapid ice flow areas that are unavailable to satellites, especially in the upstream of Lambert Glacier. Continuous internal layers of Dome A, recording the spatial change of past ice accumulation and ice-flow history over 160 ka, almost extend to the bed, with high ILCI and high basal roughness of the corresponding bed topography. There are three kinds of basal roughness patterns along the traverse, that is, “low ξt low η”, “low ξt high η”, and “high ξt high η”, where ξt represents the amplitude of the undulations, and quantifies the vertical variation of the bedrock, and η measures the frequency variation of fluctuations and the horizontal irregularity of the profile. The characteristics of internal layers and basal topography of the traverse between Zhongshan Station and Dome A provide new information for understanding the ancient ice-flow activity and the historical evolution of EAIS. |
format |
Text |
author |
Kun Luo Sixin Liu Jingxue Guo Tiantian Wang Lin Li Xiangbin Cui Bo Sun Xueyuan Tang |
author_facet |
Kun Luo Sixin Liu Jingxue Guo Tiantian Wang Lin Li Xiangbin Cui Bo Sun Xueyuan Tang |
author_sort |
Kun Luo |
title |
Radar-Derived Internal Structure and Basal Roughness Characterization along a Traverse from Zhongshan Station to Dome A, East Antarctica |
title_short |
Radar-Derived Internal Structure and Basal Roughness Characterization along a Traverse from Zhongshan Station to Dome A, East Antarctica |
title_full |
Radar-Derived Internal Structure and Basal Roughness Characterization along a Traverse from Zhongshan Station to Dome A, East Antarctica |
title_fullStr |
Radar-Derived Internal Structure and Basal Roughness Characterization along a Traverse from Zhongshan Station to Dome A, East Antarctica |
title_full_unstemmed |
Radar-Derived Internal Structure and Basal Roughness Characterization along a Traverse from Zhongshan Station to Dome A, East Antarctica |
title_sort |
radar-derived internal structure and basal roughness characterization along a traverse from zhongshan station to dome a, east antarctica |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2020 |
url |
https://doi.org/10.3390/rs12071079 |
op_coverage |
agris |
long_lat |
ENVELOPE(67.490,67.490,-73.065,-73.065) ENVELOPE(76.371,76.371,-69.373,-69.373) ENVELOPE(76.371,76.371,-69.373,-69.373) |
geographic |
Antarctic East Antarctica East Antarctic Ice Sheet Lambert Glacier Zhongshan Zhongshan Station |
geographic_facet |
Antarctic East Antarctica East Antarctic Ice Sheet Lambert Glacier Zhongshan Zhongshan Station |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Lambert Glacier |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Lambert Glacier |
op_source |
Remote Sensing; Volume 12; Issue 7; Pages: 1079 |
op_relation |
Environmental Remote Sensing https://dx.doi.org/10.3390/rs12071079 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/rs12071079 |
container_title |
Remote Sensing |
container_volume |
12 |
container_issue |
7 |
container_start_page |
1079 |
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1774720213400420352 |