Seasonal glacier and snow loading in Svalbard recovered from geodetic observations
We processed time-series from seven Global Navigation Satellite System (GNSS) stations and one Very Long Baseline Interferometry (VLBI) station in Svalbard. The goal was to capture the seasonal vertical displacements caused by elastic response of variable mass load due to ice and snow accumulation....
Published in: | Geophysical Journal International |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Uppsala universitet, Luft-, vatten- och landskapslära
2022
|
Subjects: | |
Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-463138 https://doi.org/10.1093/gji/ggab482 |
id |
ftuppsalauniv:oai:DiVA.org:uu-463138 |
---|---|
record_format |
openpolar |
spelling |
ftuppsalauniv:oai:DiVA.org:uu-463138 2023-05-15T16:22:16+02:00 Seasonal glacier and snow loading in Svalbard recovered from geodetic observations Kierulf, H P Van Pelt, Ward Petrov, L Dähnn, M Kirkvik, A-S Omang, O 2022 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-463138 https://doi.org/10.1093/gji/ggab482 eng eng Uppsala universitet, Luft-, vatten- och landskapslära Geodetic Institute, Norwegian Mapping Authority, 3507 Hønefoss, Norway;Department of Geosciences, University of Oslo, 0371 Oslo, Norway NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA Geodetic Institute, Norwegian Mapping Authority, 3507 Hønefoss, Norway Oxford University Press (OUP) Geophysical Journal International, 0956-540X, 2022, 229:1, s. 408-425 orcid:0000-0003-4839-7900 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-463138 doi:10.1093/gji/ggab482 ISI:000763887800003 info:eu-repo/semantics/openAccess Physical Geography Naturgeografi Article in journal info:eu-repo/semantics/article text 2022 ftuppsalauniv https://doi.org/10.1093/gji/ggab482 2023-02-23T21:58:43Z We processed time-series from seven Global Navigation Satellite System (GNSS) stations and one Very Long Baseline Interferometry (VLBI) station in Svalbard. The goal was to capture the seasonal vertical displacements caused by elastic response of variable mass load due to ice and snow accumulation. We found that estimates of the annual signal in different GNSS solutions disagree by more than 3 mm which makes geophysical interpretation of raw GNSS time-series problematic. To overcome this problem, we have used an enhanced Common Mode (CM) filtering technique. The time-series are differentiated by the time-series from remote station BJOS with known mass loading signals removed a priori. Using this technique, we have achieved a substantial reduction of the differences between the GNSS solutions. We have computed mass loading time-series from a regional Climatic Mass Balance (CMB) and snow model that provides the amount of water equivalent at a 1 km resolution with a time step of 7 d. We found that the entire vertical loading signal is present in data of two totally independent techniques at a statistically significant level of 95 per cent. This allowed us to conclude that the remaining errors in vertical signal derived from the CMB model are less than 0.2 mm at that significance level. Refining the land water storage loading model with a CMB model resulted in a reduction of the annual amplitude from 2.1 to 1.1 mm in the CM filtered time-series, while it had only a marginal impact on raw time-series. This provides a strong evidence that CM filtering is essential for revealing local periodic signals when a millimetre level of accuracy is required. Article in Journal/Newspaper glacier Svalbard Uppsala University: Publications (DiVA) Svalbard Geophysical Journal International 229 1 408 425 |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Physical Geography Naturgeografi |
spellingShingle |
Physical Geography Naturgeografi Kierulf, H P Van Pelt, Ward Petrov, L Dähnn, M Kirkvik, A-S Omang, O Seasonal glacier and snow loading in Svalbard recovered from geodetic observations |
topic_facet |
Physical Geography Naturgeografi |
description |
We processed time-series from seven Global Navigation Satellite System (GNSS) stations and one Very Long Baseline Interferometry (VLBI) station in Svalbard. The goal was to capture the seasonal vertical displacements caused by elastic response of variable mass load due to ice and snow accumulation. We found that estimates of the annual signal in different GNSS solutions disagree by more than 3 mm which makes geophysical interpretation of raw GNSS time-series problematic. To overcome this problem, we have used an enhanced Common Mode (CM) filtering technique. The time-series are differentiated by the time-series from remote station BJOS with known mass loading signals removed a priori. Using this technique, we have achieved a substantial reduction of the differences between the GNSS solutions. We have computed mass loading time-series from a regional Climatic Mass Balance (CMB) and snow model that provides the amount of water equivalent at a 1 km resolution with a time step of 7 d. We found that the entire vertical loading signal is present in data of two totally independent techniques at a statistically significant level of 95 per cent. This allowed us to conclude that the remaining errors in vertical signal derived from the CMB model are less than 0.2 mm at that significance level. Refining the land water storage loading model with a CMB model resulted in a reduction of the annual amplitude from 2.1 to 1.1 mm in the CM filtered time-series, while it had only a marginal impact on raw time-series. This provides a strong evidence that CM filtering is essential for revealing local periodic signals when a millimetre level of accuracy is required. |
format |
Article in Journal/Newspaper |
author |
Kierulf, H P Van Pelt, Ward Petrov, L Dähnn, M Kirkvik, A-S Omang, O |
author_facet |
Kierulf, H P Van Pelt, Ward Petrov, L Dähnn, M Kirkvik, A-S Omang, O |
author_sort |
Kierulf, H P |
title |
Seasonal glacier and snow loading in Svalbard recovered from geodetic observations |
title_short |
Seasonal glacier and snow loading in Svalbard recovered from geodetic observations |
title_full |
Seasonal glacier and snow loading in Svalbard recovered from geodetic observations |
title_fullStr |
Seasonal glacier and snow loading in Svalbard recovered from geodetic observations |
title_full_unstemmed |
Seasonal glacier and snow loading in Svalbard recovered from geodetic observations |
title_sort |
seasonal glacier and snow loading in svalbard recovered from geodetic observations |
publisher |
Uppsala universitet, Luft-, vatten- och landskapslära |
publishDate |
2022 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-463138 https://doi.org/10.1093/gji/ggab482 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
glacier Svalbard |
genre_facet |
glacier Svalbard |
op_relation |
Geophysical Journal International, 0956-540X, 2022, 229:1, s. 408-425 orcid:0000-0003-4839-7900 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-463138 doi:10.1093/gji/ggab482 ISI:000763887800003 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/gji/ggab482 |
container_title |
Geophysical Journal International |
container_volume |
229 |
container_issue |
1 |
container_start_page |
408 |
op_container_end_page |
425 |
_version_ |
1766010237824794624 |