Elevation Changes of the Antarctic Ice Sheet from Joint Envisat and CryoSat-2 Radar Altimetry
The elevation changes of ice sheets have been recognized as an essential climate variable. Long-term time series of these changes are an important parameter to understand climate change, and the longest time-series of ice sheet elevation changes can be derived from combining multiple Ku-band satelli...
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Online Access: | https://doi.org/10.3390/rs12223746 https://doaj.org/article/2ae46cdae9ac47a99c9da9f0cb9d01e2 |
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ftdoajarticles:oai:doaj.org/article:2ae46cdae9ac47a99c9da9f0cb9d01e2 2023-05-15T13:24:10+02:00 Elevation Changes of the Antarctic Ice Sheet from Joint Envisat and CryoSat-2 Radar Altimetry Baojun Zhang Zemin Wang Quanming Yang Jingbin Liu Jiachun An Fei Li Tingting Liu Hong Geng 2020-11-01T00:00:00Z https://doi.org/10.3390/rs12223746 https://doaj.org/article/2ae46cdae9ac47a99c9da9f0cb9d01e2 EN eng MDPI AG https://www.mdpi.com/2072-4292/12/22/3746 https://doaj.org/toc/2072-4292 doi:10.3390/rs12223746 2072-4292 https://doaj.org/article/2ae46cdae9ac47a99c9da9f0cb9d01e2 Remote Sensing, Vol 12, Iss 3746, p 3746 (2020) Antarctic ice sheet satellite radar altimetry long-term time series elevation changes Science Q article 2020 ftdoajarticles https://doi.org/10.3390/rs12223746 2022-12-30T20:32:57Z The elevation changes of ice sheets have been recognized as an essential climate variable. Long-term time series of these changes are an important parameter to understand climate change, and the longest time-series of ice sheet elevation changes can be derived from combining multiple Ku-band satellite altimetry missions. However, unresolved intermission biases obscure the record. Here, we revise the mathematical model commonly used in the literature to simultaneously correct for intermission bias and ascending–descending bias to ensure the self-consistency and cohesion of the elevation time series across missions. This updated approach is applied to combine Envisat and CryoSat-2 radar altimetry in the period of 2002–2019. We tested this approach by validating it against airborne and satellite laser altimetry. Combining the detailed temporal and spatial evolution of elevation changes with firn densification-modeled volume changes due to surface processes, we found that the Amundsen Sea sector accounts for most of the total volume loss of the Antarctic Ice Sheet (AIS), mainly from ice dynamics. However, surface processes dominate the volume changes in the key regions, such as the Totten Glacier sector, Dronning Maud Land, Princess Elizabeth Land, and the Bellingshausen Sea sector. Overall, accelerated volume loss in the West Antarctic continues to outpace the gains observed in the East Antarctic. The total volume change during 2002–2019 for the AIS was −68.7 ± 8.1 km 3 /y, with an acceleration of −5.5 ± 0.9 km 3 /y 2 . Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Bellingshausen Sea Dronning Maud Land Ice Sheet Princess Elizabeth Land Totten Glacier Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Dronning Maud Land Amundsen Sea Bellingshausen Sea Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Princess Elizabeth Land ENVELOPE(80.367,80.367,-68.500,-68.500) Remote Sensing 12 22 3746 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic ice sheet satellite radar altimetry long-term time series elevation changes Science Q |
spellingShingle |
Antarctic ice sheet satellite radar altimetry long-term time series elevation changes Science Q Baojun Zhang Zemin Wang Quanming Yang Jingbin Liu Jiachun An Fei Li Tingting Liu Hong Geng Elevation Changes of the Antarctic Ice Sheet from Joint Envisat and CryoSat-2 Radar Altimetry |
topic_facet |
Antarctic ice sheet satellite radar altimetry long-term time series elevation changes Science Q |
description |
The elevation changes of ice sheets have been recognized as an essential climate variable. Long-term time series of these changes are an important parameter to understand climate change, and the longest time-series of ice sheet elevation changes can be derived from combining multiple Ku-band satellite altimetry missions. However, unresolved intermission biases obscure the record. Here, we revise the mathematical model commonly used in the literature to simultaneously correct for intermission bias and ascending–descending bias to ensure the self-consistency and cohesion of the elevation time series across missions. This updated approach is applied to combine Envisat and CryoSat-2 radar altimetry in the period of 2002–2019. We tested this approach by validating it against airborne and satellite laser altimetry. Combining the detailed temporal and spatial evolution of elevation changes with firn densification-modeled volume changes due to surface processes, we found that the Amundsen Sea sector accounts for most of the total volume loss of the Antarctic Ice Sheet (AIS), mainly from ice dynamics. However, surface processes dominate the volume changes in the key regions, such as the Totten Glacier sector, Dronning Maud Land, Princess Elizabeth Land, and the Bellingshausen Sea sector. Overall, accelerated volume loss in the West Antarctic continues to outpace the gains observed in the East Antarctic. The total volume change during 2002–2019 for the AIS was −68.7 ± 8.1 km 3 /y, with an acceleration of −5.5 ± 0.9 km 3 /y 2 . |
format |
Article in Journal/Newspaper |
author |
Baojun Zhang Zemin Wang Quanming Yang Jingbin Liu Jiachun An Fei Li Tingting Liu Hong Geng |
author_facet |
Baojun Zhang Zemin Wang Quanming Yang Jingbin Liu Jiachun An Fei Li Tingting Liu Hong Geng |
author_sort |
Baojun Zhang |
title |
Elevation Changes of the Antarctic Ice Sheet from Joint Envisat and CryoSat-2 Radar Altimetry |
title_short |
Elevation Changes of the Antarctic Ice Sheet from Joint Envisat and CryoSat-2 Radar Altimetry |
title_full |
Elevation Changes of the Antarctic Ice Sheet from Joint Envisat and CryoSat-2 Radar Altimetry |
title_fullStr |
Elevation Changes of the Antarctic Ice Sheet from Joint Envisat and CryoSat-2 Radar Altimetry |
title_full_unstemmed |
Elevation Changes of the Antarctic Ice Sheet from Joint Envisat and CryoSat-2 Radar Altimetry |
title_sort |
elevation changes of the antarctic ice sheet from joint envisat and cryosat-2 radar altimetry |
publisher |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/rs12223746 https://doaj.org/article/2ae46cdae9ac47a99c9da9f0cb9d01e2 |
long_lat |
ENVELOPE(116.333,116.333,-66.833,-66.833) ENVELOPE(80.367,80.367,-68.500,-68.500) |
geographic |
Antarctic The Antarctic Dronning Maud Land Amundsen Sea Bellingshausen Sea Totten Glacier Princess Elizabeth Land |
geographic_facet |
Antarctic The Antarctic Dronning Maud Land Amundsen Sea Bellingshausen Sea Totten Glacier Princess Elizabeth Land |
genre |
Amundsen Sea Antarc* Antarctic Bellingshausen Sea Dronning Maud Land Ice Sheet Princess Elizabeth Land Totten Glacier |
genre_facet |
Amundsen Sea Antarc* Antarctic Bellingshausen Sea Dronning Maud Land Ice Sheet Princess Elizabeth Land Totten Glacier |
op_source |
Remote Sensing, Vol 12, Iss 3746, p 3746 (2020) |
op_relation |
https://www.mdpi.com/2072-4292/12/22/3746 https://doaj.org/toc/2072-4292 doi:10.3390/rs12223746 2072-4292 https://doaj.org/article/2ae46cdae9ac47a99c9da9f0cb9d01e2 |
op_doi |
https://doi.org/10.3390/rs12223746 |
container_title |
Remote Sensing |
container_volume |
12 |
container_issue |
22 |
container_start_page |
3746 |
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