Sea-ice freeboard and thickness in the Ross Sea from airborne (IceBridge 2013) and satellite (ICESat 2003–2008) observations

Abstract NASA's Operation IceBridge mission flew over the Ross Sea, Antarctica (20 and 27 November 2013) and collected data with Airborne Topographic Mapper (ATM) and Digital Mapping System (DMS). Using the DMS and reflectivity of ATM L1B, leads are detected to define local sea level height. Th...

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Published in:Annals of Glaciology
Main Authors: Tian, Liuxi, Xie, Hongjie, Ackley, Stephen F., Tang, Jiakui, Mestas-Nuñez, Alberto M., Wang, Xianwei
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2020
Subjects:
Online Access:http://dx.doi.org/10.1017/aog.2019.49
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305519000491
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spelling crcambridgeupr:10.1017/aog.2019.49 2024-06-09T07:37:55+00:00 Sea-ice freeboard and thickness in the Ross Sea from airborne (IceBridge 2013) and satellite (ICESat 2003–2008) observations Tian, Liuxi Xie, Hongjie Ackley, Stephen F. Tang, Jiakui Mestas-Nuñez, Alberto M. Wang, Xianwei 2020 http://dx.doi.org/10.1017/aog.2019.49 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305519000491 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Annals of Glaciology volume 61, issue 82, page 24-39 ISSN 0260-3055 1727-5644 journal-article 2020 crcambridgeupr https://doi.org/10.1017/aog.2019.49 2024-05-15T12:57:48Z Abstract NASA's Operation IceBridge mission flew over the Ross Sea, Antarctica (20 and 27 November 2013) and collected data with Airborne Topographic Mapper (ATM) and Digital Mapping System (DMS). Using the DMS and reflectivity of ATM L1B, leads are detected to define local sea level height. The total freeboard is then obtained and converted to ice thickness. The estimated mean sea-ice thickness values are found to be in the 0.48–0.99 m range. Along the N-S track, sea ice was thinner southward rather than northward of the fluxgate, resulting in two peaks of modal thickness: 0.35 m (south) and 0.7 m (north). This supports that new ice produced in coastal polynyas is transported northward by katabatic winds off the ice-shelf. The lowest (2%) elevation method used for freeboard retrieval for ICESat is also tested for ATM data. It is found that the lowest elevation method tends to overestimate freeboard, but mean values are less affected than mode values. Using mean thickness values of ICESat and ATM along the ‘fluxgate’, separating the shelf from the deep ocean, the exported ice volume at this ‘fluxgate’ is found to be higher during the ICESat years (2003–2008) than during the IceBridge year (2013). Article in Journal/Newspaper Airborne Topographic Mapper Annals of Glaciology Antarc* Antarctica Ice Shelf Ross Sea Sea ice Cambridge University Press Ross Sea Annals of Glaciology 61 82 24 39
institution Open Polar
collection Cambridge University Press
op_collection_id crcambridgeupr
language English
description Abstract NASA's Operation IceBridge mission flew over the Ross Sea, Antarctica (20 and 27 November 2013) and collected data with Airborne Topographic Mapper (ATM) and Digital Mapping System (DMS). Using the DMS and reflectivity of ATM L1B, leads are detected to define local sea level height. The total freeboard is then obtained and converted to ice thickness. The estimated mean sea-ice thickness values are found to be in the 0.48–0.99 m range. Along the N-S track, sea ice was thinner southward rather than northward of the fluxgate, resulting in two peaks of modal thickness: 0.35 m (south) and 0.7 m (north). This supports that new ice produced in coastal polynyas is transported northward by katabatic winds off the ice-shelf. The lowest (2%) elevation method used for freeboard retrieval for ICESat is also tested for ATM data. It is found that the lowest elevation method tends to overestimate freeboard, but mean values are less affected than mode values. Using mean thickness values of ICESat and ATM along the ‘fluxgate’, separating the shelf from the deep ocean, the exported ice volume at this ‘fluxgate’ is found to be higher during the ICESat years (2003–2008) than during the IceBridge year (2013).
format Article in Journal/Newspaper
author Tian, Liuxi
Xie, Hongjie
Ackley, Stephen F.
Tang, Jiakui
Mestas-Nuñez, Alberto M.
Wang, Xianwei
spellingShingle Tian, Liuxi
Xie, Hongjie
Ackley, Stephen F.
Tang, Jiakui
Mestas-Nuñez, Alberto M.
Wang, Xianwei
Sea-ice freeboard and thickness in the Ross Sea from airborne (IceBridge 2013) and satellite (ICESat 2003–2008) observations
author_facet Tian, Liuxi
Xie, Hongjie
Ackley, Stephen F.
Tang, Jiakui
Mestas-Nuñez, Alberto M.
Wang, Xianwei
author_sort Tian, Liuxi
title Sea-ice freeboard and thickness in the Ross Sea from airborne (IceBridge 2013) and satellite (ICESat 2003–2008) observations
title_short Sea-ice freeboard and thickness in the Ross Sea from airborne (IceBridge 2013) and satellite (ICESat 2003–2008) observations
title_full Sea-ice freeboard and thickness in the Ross Sea from airborne (IceBridge 2013) and satellite (ICESat 2003–2008) observations
title_fullStr Sea-ice freeboard and thickness in the Ross Sea from airborne (IceBridge 2013) and satellite (ICESat 2003–2008) observations
title_full_unstemmed Sea-ice freeboard and thickness in the Ross Sea from airborne (IceBridge 2013) and satellite (ICESat 2003–2008) observations
title_sort sea-ice freeboard and thickness in the ross sea from airborne (icebridge 2013) and satellite (icesat 2003–2008) observations
publisher Cambridge University Press (CUP)
publishDate 2020
url http://dx.doi.org/10.1017/aog.2019.49
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305519000491
geographic Ross Sea
geographic_facet Ross Sea
genre Airborne Topographic Mapper
Annals of Glaciology
Antarc*
Antarctica
Ice Shelf
Ross Sea
Sea ice
genre_facet Airborne Topographic Mapper
Annals of Glaciology
Antarc*
Antarctica
Ice Shelf
Ross Sea
Sea ice
op_source Annals of Glaciology
volume 61, issue 82, page 24-39
ISSN 0260-3055 1727-5644
op_rights http://creativecommons.org/licenses/by/4.0/
op_doi https://doi.org/10.1017/aog.2019.49
container_title Annals of Glaciology
container_volume 61
container_issue 82
container_start_page 24
op_container_end_page 39
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