Tide-corrected flow velocity and mass balance of Campbell Glacier Tongue, East Antarctica, derived from interferometric SAR
Accurate measurement of ice-flow velocity of floating glaciers is required to estimate ice mass balance from volume flux thinning/thickening, basal melting/freezing, and surface accumulation/ablation. We derived a tide-corrected ice velocity map and mass budget of Campbell Glacier Tongue (CGT) in Ea...
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Online Access: | https://scholarworks.unist.ac.kr/handle/201301/10943 https://doi.org/10.1016/j.rse.2015.01.014 http://www.sciencedirect.com/science/article/pii/S0034425715000322# |
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ftuisanist:oai:scholarworks.unist.ac.kr:201301/10943 2023-05-15T13:56:05+02:00 Tide-corrected flow velocity and mass balance of Campbell Glacier Tongue, East Antarctica, derived from interferometric SAR Han, Hyangsun Lee, Hoonyol 2015-04 https://scholarworks.unist.ac.kr/handle/201301/10943 https://doi.org/10.1016/j.rse.2015.01.014 http://www.sciencedirect.com/science/article/pii/S0034425715000322# ?????? unknown ELSEVIER SCIENCE INC REMOTE SENSING OF ENVIRONMENT, v.160, pp.180 - 192 0034-4257 https://scholarworks.unist.ac.kr/handle/201301/10943 2281 20384 2-s2.0-85027948757 000351644700016 doi:10.1016/j.rse.2015.01.014 http://www.sciencedirect.com/science/article/pii/S0034425715000322# ARTICLE ART 2015 ftuisanist https://doi.org/10.1016/j.rse.2015.01.014 2022-05-15T05:23:25Z Accurate measurement of ice-flow velocity of floating glaciers is required to estimate ice mass balance from volume flux thinning/thickening, basal melting/freezing, and surface accumulation/ablation. We derived a tide-corrected ice velocity map and mass budget of Campbell Glacier Tongue (CGT) in East Antarctica by using 14 COSMO-SkyMed one-day tandem differential interferometric SAR (DInSAR) pairs obtained from January to November 2011. The vertical tidal deflection of CGT was estimated and removed from the DInSAR images by using a tide deflection ratio map generated by double-differential InSAR (DDInSAR) method. We then generated averaged ice-flow velocity (v map) and its standard deviation (?? v map). Ice-flow velocity increased from the upper part of the grounding line (~0.20md-1) to the seaward edge of CGT (~0.67md-1) with ?? v less than ~0.04md-1 in the main stream of CGT. The eastern part of CGT flows slower than the western part because it is grounded along the flow line and thus experiences severe basal drag. Flux mass balance (FMB), i.e., ice thickness change by volume flux divergence, of CGT was obtained by combining the v map and an ice thickness value of 340??18m estimated by the ICESat GLAS data. We used mass conservation assumption in which total mass balance (TMB, -6.29??1.37ma-1 observed by ICESat GLAS data) is attributed to FMB, basal mass balance (BMB) and surface mass balance (SMB, 0.24??0.02ma-1). Mass loss in the freely floating zone of CGT is mainly caused by basal melting (BMB =-144.5??39.9Mta-1) while thinning by volume flux (FMB =-67.2??8.9Mta-1) is relatively small. In the hinge zone of CGT, mass change is contributed to FMB of -147.3??25.2Mta-1 and BMB of 15.3??39.8Mta-1. However, basal freezing derived for the hinge zone may be erroneous as a result of the constant ice thickness assumption extrapolated from the freely floating zone close 1 0 Article in Journal/Newspaper Antarc* Antarctica East Antarctica ScholarWorks@UNIST (Ulsan National Institute of Science and Technology) Campbell Glacier ENVELOPE(45.683,45.683,-67.800,-67.800) Campbell Glacier Tongue ENVELOPE(164.400,164.400,-74.600,-74.600) East Antarctica Remote Sensing of Environment 160 180 192 |
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Open Polar |
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ScholarWorks@UNIST (Ulsan National Institute of Science and Technology) |
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ftuisanist |
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unknown |
description |
Accurate measurement of ice-flow velocity of floating glaciers is required to estimate ice mass balance from volume flux thinning/thickening, basal melting/freezing, and surface accumulation/ablation. We derived a tide-corrected ice velocity map and mass budget of Campbell Glacier Tongue (CGT) in East Antarctica by using 14 COSMO-SkyMed one-day tandem differential interferometric SAR (DInSAR) pairs obtained from January to November 2011. The vertical tidal deflection of CGT was estimated and removed from the DInSAR images by using a tide deflection ratio map generated by double-differential InSAR (DDInSAR) method. We then generated averaged ice-flow velocity (v map) and its standard deviation (?? v map). Ice-flow velocity increased from the upper part of the grounding line (~0.20md-1) to the seaward edge of CGT (~0.67md-1) with ?? v less than ~0.04md-1 in the main stream of CGT. The eastern part of CGT flows slower than the western part because it is grounded along the flow line and thus experiences severe basal drag. Flux mass balance (FMB), i.e., ice thickness change by volume flux divergence, of CGT was obtained by combining the v map and an ice thickness value of 340??18m estimated by the ICESat GLAS data. We used mass conservation assumption in which total mass balance (TMB, -6.29??1.37ma-1 observed by ICESat GLAS data) is attributed to FMB, basal mass balance (BMB) and surface mass balance (SMB, 0.24??0.02ma-1). Mass loss in the freely floating zone of CGT is mainly caused by basal melting (BMB =-144.5??39.9Mta-1) while thinning by volume flux (FMB =-67.2??8.9Mta-1) is relatively small. In the hinge zone of CGT, mass change is contributed to FMB of -147.3??25.2Mta-1 and BMB of 15.3??39.8Mta-1. However, basal freezing derived for the hinge zone may be erroneous as a result of the constant ice thickness assumption extrapolated from the freely floating zone close 1 0 |
format |
Article in Journal/Newspaper |
author |
Han, Hyangsun Lee, Hoonyol |
spellingShingle |
Han, Hyangsun Lee, Hoonyol Tide-corrected flow velocity and mass balance of Campbell Glacier Tongue, East Antarctica, derived from interferometric SAR |
author_facet |
Han, Hyangsun Lee, Hoonyol |
author_sort |
Han, Hyangsun |
title |
Tide-corrected flow velocity and mass balance of Campbell Glacier Tongue, East Antarctica, derived from interferometric SAR |
title_short |
Tide-corrected flow velocity and mass balance of Campbell Glacier Tongue, East Antarctica, derived from interferometric SAR |
title_full |
Tide-corrected flow velocity and mass balance of Campbell Glacier Tongue, East Antarctica, derived from interferometric SAR |
title_fullStr |
Tide-corrected flow velocity and mass balance of Campbell Glacier Tongue, East Antarctica, derived from interferometric SAR |
title_full_unstemmed |
Tide-corrected flow velocity and mass balance of Campbell Glacier Tongue, East Antarctica, derived from interferometric SAR |
title_sort |
tide-corrected flow velocity and mass balance of campbell glacier tongue, east antarctica, derived from interferometric sar |
publisher |
ELSEVIER SCIENCE INC |
publishDate |
2015 |
url |
https://scholarworks.unist.ac.kr/handle/201301/10943 https://doi.org/10.1016/j.rse.2015.01.014 http://www.sciencedirect.com/science/article/pii/S0034425715000322# |
long_lat |
ENVELOPE(45.683,45.683,-67.800,-67.800) ENVELOPE(164.400,164.400,-74.600,-74.600) |
geographic |
Campbell Glacier Campbell Glacier Tongue East Antarctica |
geographic_facet |
Campbell Glacier Campbell Glacier Tongue East Antarctica |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_relation |
REMOTE SENSING OF ENVIRONMENT, v.160, pp.180 - 192 0034-4257 https://scholarworks.unist.ac.kr/handle/201301/10943 2281 20384 2-s2.0-85027948757 000351644700016 doi:10.1016/j.rse.2015.01.014 http://www.sciencedirect.com/science/article/pii/S0034425715000322# |
op_doi |
https://doi.org/10.1016/j.rse.2015.01.014 |
container_title |
Remote Sensing of Environment |
container_volume |
160 |
container_start_page |
180 |
op_container_end_page |
192 |
_version_ |
1766263304092647424 |