Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements
Frontal ablation contributes significantly to the mass balance of tidewater glaciers in Svalbard and can be recovered with high temporal resolution using continuous seismic records. Determination of the relative contribution of dynamic ice loss through calving to frontal ablation requires precise es...
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Copernicus Publications
2019
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ftdoajarticles:oai:doaj.org/article:d7bf67cf4a814b3d828a58a3a8a4f5ba 2023-05-15T16:22:12+02:00 Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements A. Köhler M. Pętlicki P.-M. Lefeuvre G. Buscaino C. Nuth C. Weidle 2019-11-01T00:00:00Z https://doi.org/10.5194/tc-13-3117-2019 https://doaj.org/article/d7bf67cf4a814b3d828a58a3a8a4f5ba EN eng Copernicus Publications https://www.the-cryosphere.net/13/3117/2019/tc-13-3117-2019.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-13-3117-2019 1994-0416 1994-0424 https://doaj.org/article/d7bf67cf4a814b3d828a58a3a8a4f5ba The Cryosphere, Vol 13, Pp 3117-3137 (2019) Environmental sciences GE1-350 Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.5194/tc-13-3117-2019 2022-12-31T03:39:39Z Frontal ablation contributes significantly to the mass balance of tidewater glaciers in Svalbard and can be recovered with high temporal resolution using continuous seismic records. Determination of the relative contribution of dynamic ice loss through calving to frontal ablation requires precise estimates of calving volumes at the same temporal resolution. We combine seismic and hydroacoustic observations close to the calving front of Kronebreen, a marine-terminating glacier in Svalbard, with repeat lidar scanning of the glacier front. Simultaneous time-lapse photography is used to assign volumes measured from lidar scans to seismically detected calving events. Empirical models derived from signal properties such as integrated amplitude are able to replicate volumes of individual calving events and cumulative subaerial ice loss over different lidar scan intervals from seismic and hydroacoustic data alone. This enables quantification of the contribution of calving to frontal ablation, which we estimate for Kronebreen to be about 18 %–30 %, slightly below the subaerially exposed area of the glacier front. We further develop a model calibrated for the permanent seismic Kings Bay station (KBS) at about 15 km distance from the glacier front, where 15 %–60 % of calving events can be detected under variable noise conditions due to reduced signal amplitudes at distance. Between 2007 and 2017, we find a 5 %–30 % contribution of calving ice blocks to frontal ablation, which emphasizes the importance of underwater melting (roughly 4–9 m d −1 ). This study shows the feasibility to seismically monitor not only frontal ablation rates but also the dynamic ice loss contribution continuously and at high temporal resolution. Article in Journal/Newspaper glacier Svalbard The Cryosphere Tidewater Directory of Open Access Journals: DOAJ Articles Kings Bay ENVELOPE(-117.760,-117.760,70.731,70.731) Kronebreen ENVELOPE(13.333,13.333,78.833,78.833) Svalbard The Cryosphere 13 11 3117 3137 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 A. Köhler M. Pętlicki P.-M. Lefeuvre G. Buscaino C. Nuth C. Weidle Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Frontal ablation contributes significantly to the mass balance of tidewater glaciers in Svalbard and can be recovered with high temporal resolution using continuous seismic records. Determination of the relative contribution of dynamic ice loss through calving to frontal ablation requires precise estimates of calving volumes at the same temporal resolution. We combine seismic and hydroacoustic observations close to the calving front of Kronebreen, a marine-terminating glacier in Svalbard, with repeat lidar scanning of the glacier front. Simultaneous time-lapse photography is used to assign volumes measured from lidar scans to seismically detected calving events. Empirical models derived from signal properties such as integrated amplitude are able to replicate volumes of individual calving events and cumulative subaerial ice loss over different lidar scan intervals from seismic and hydroacoustic data alone. This enables quantification of the contribution of calving to frontal ablation, which we estimate for Kronebreen to be about 18 %–30 %, slightly below the subaerially exposed area of the glacier front. We further develop a model calibrated for the permanent seismic Kings Bay station (KBS) at about 15 km distance from the glacier front, where 15 %–60 % of calving events can be detected under variable noise conditions due to reduced signal amplitudes at distance. Between 2007 and 2017, we find a 5 %–30 % contribution of calving ice blocks to frontal ablation, which emphasizes the importance of underwater melting (roughly 4–9 m d −1 ). This study shows the feasibility to seismically monitor not only frontal ablation rates but also the dynamic ice loss contribution continuously and at high temporal resolution. |
format |
Article in Journal/Newspaper |
author |
A. Köhler M. Pętlicki P.-M. Lefeuvre G. Buscaino C. Nuth C. Weidle |
author_facet |
A. Köhler M. Pętlicki P.-M. Lefeuvre G. Buscaino C. Nuth C. Weidle |
author_sort |
A. Köhler |
title |
Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements |
title_short |
Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements |
title_full |
Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements |
title_fullStr |
Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements |
title_full_unstemmed |
Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements |
title_sort |
contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-3117-2019 https://doaj.org/article/d7bf67cf4a814b3d828a58a3a8a4f5ba |
long_lat |
ENVELOPE(-117.760,-117.760,70.731,70.731) ENVELOPE(13.333,13.333,78.833,78.833) |
geographic |
Kings Bay Kronebreen Svalbard |
geographic_facet |
Kings Bay Kronebreen Svalbard |
genre |
glacier Svalbard The Cryosphere Tidewater |
genre_facet |
glacier Svalbard The Cryosphere Tidewater |
op_source |
The Cryosphere, Vol 13, Pp 3117-3137 (2019) |
op_relation |
https://www.the-cryosphere.net/13/3117/2019/tc-13-3117-2019.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-13-3117-2019 1994-0416 1994-0424 https://doaj.org/article/d7bf67cf4a814b3d828a58a3a8a4f5ba |
op_doi |
https://doi.org/10.5194/tc-13-3117-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
11 |
container_start_page |
3117 |
op_container_end_page |
3137 |
_version_ |
1766010168749850624 |