Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers
Glaciological and geodetic methods provide independent observations of glacier mass balance. The glaciological method measures the surface mass balance, on a seasonal or annual basis, whereas the geodetic method measures surface, internal, and basal mass balances, over a period of years or decades....
Published in: | The Cryosphere |
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Copernicus Publications
2016
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00013884 2023-05-15T16:21:59+02:00 Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers Andreassen, Liss M. Elvehøy, Hallgeir Kjøllmoen, Bjarne Engeset, Rune V. 2016-03 electronic https://doi.org/10.5194/tc-10-535-2016 https://noa.gwlb.de/receive/cop_mods_00013884 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013840/tc-10-535-2016.pdf https://tc.copernicus.org/articles/10/535/2016/tc-10-535-2016.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-535-2016 https://noa.gwlb.de/receive/cop_mods_00013884 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013840/tc-10-535-2016.pdf https://tc.copernicus.org/articles/10/535/2016/tc-10-535-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/tc-10-535-2016 2022-02-08T22:55:25Z Glaciological and geodetic methods provide independent observations of glacier mass balance. The glaciological method measures the surface mass balance, on a seasonal or annual basis, whereas the geodetic method measures surface, internal, and basal mass balances, over a period of years or decades. In this paper, we reanalyse the 10 glaciers with long-term mass-balance series in Norway. The reanalysis includes (i) homogenisation of both glaciological and geodetic observation series, (ii) uncertainty assessment, (iii) estimates of generic differences including estimates of internal and basal melt, (iv) validation, and, if needed, (v) calibration of mass-balance series. This study comprises an extensive set of data (484 mass-balance years, 34 geodetic surveys, and large volumes of supporting data, such as metadata and field notes). In total, 21 periods of data were compared and the results show discrepancies between the glaciological and geodetic methods for some glaciers, which are attributed in part to internal and basal ablation and in part to inhomogeneity in the data processing. Deviations were smaller than 0.2 m w.e. a−1 for 12 out of 21 periods. Calibration was applied to 7 out of 21 periods, as the deviations were larger than the uncertainty. The reanalysed glaciological series shows a more consistent signal of glacier change over the period of observations than previously reported: six glaciers had a significant mass loss (14–22 m w.e.) and four glaciers were nearly in balance. All glaciers have lost mass after the year 2000. More research is needed on the sources of uncertainty to reduce uncertainties and adjust the observation programmes accordingly. The study confirms the value of carrying out independent high-quality geodetic surveys to check and correct field observations. Article in Journal/Newspaper glacier The Cryosphere Niedersächsisches Online-Archiv NOA Norway The Cryosphere 10 2 535 552 |
institution |
Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Andreassen, Liss M. Elvehøy, Hallgeir Kjøllmoen, Bjarne Engeset, Rune V. Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers |
topic_facet |
article Verlagsveröffentlichung |
description |
Glaciological and geodetic methods provide independent observations of glacier mass balance. The glaciological method measures the surface mass balance, on a seasonal or annual basis, whereas the geodetic method measures surface, internal, and basal mass balances, over a period of years or decades. In this paper, we reanalyse the 10 glaciers with long-term mass-balance series in Norway. The reanalysis includes (i) homogenisation of both glaciological and geodetic observation series, (ii) uncertainty assessment, (iii) estimates of generic differences including estimates of internal and basal melt, (iv) validation, and, if needed, (v) calibration of mass-balance series. This study comprises an extensive set of data (484 mass-balance years, 34 geodetic surveys, and large volumes of supporting data, such as metadata and field notes). In total, 21 periods of data were compared and the results show discrepancies between the glaciological and geodetic methods for some glaciers, which are attributed in part to internal and basal ablation and in part to inhomogeneity in the data processing. Deviations were smaller than 0.2 m w.e. a−1 for 12 out of 21 periods. Calibration was applied to 7 out of 21 periods, as the deviations were larger than the uncertainty. The reanalysed glaciological series shows a more consistent signal of glacier change over the period of observations than previously reported: six glaciers had a significant mass loss (14–22 m w.e.) and four glaciers were nearly in balance. All glaciers have lost mass after the year 2000. More research is needed on the sources of uncertainty to reduce uncertainties and adjust the observation programmes accordingly. The study confirms the value of carrying out independent high-quality geodetic surveys to check and correct field observations. |
format |
Article in Journal/Newspaper |
author |
Andreassen, Liss M. Elvehøy, Hallgeir Kjøllmoen, Bjarne Engeset, Rune V. |
author_facet |
Andreassen, Liss M. Elvehøy, Hallgeir Kjøllmoen, Bjarne Engeset, Rune V. |
author_sort |
Andreassen, Liss M. |
title |
Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers |
title_short |
Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers |
title_full |
Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers |
title_fullStr |
Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers |
title_full_unstemmed |
Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers |
title_sort |
reanalysis of long-term series of glaciological and geodetic mass balance for 10 norwegian glaciers |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-535-2016 https://noa.gwlb.de/receive/cop_mods_00013884 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013840/tc-10-535-2016.pdf https://tc.copernicus.org/articles/10/535/2016/tc-10-535-2016.pdf |
geographic |
Norway |
geographic_facet |
Norway |
genre |
glacier The Cryosphere |
genre_facet |
glacier The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-535-2016 https://noa.gwlb.de/receive/cop_mods_00013884 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013840/tc-10-535-2016.pdf https://tc.copernicus.org/articles/10/535/2016/tc-10-535-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-10-535-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
2 |
container_start_page |
535 |
op_container_end_page |
552 |
_version_ |
1766009955838590976 |