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....
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ftdoajarticles:oai:doaj.org/article:9678fb2fb67e4e4bb985e191098485c4 2023-05-15T16:21:59+02:00 Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers L. M. Andreassen H. Elvehøy B. Kjøllmoen R. V. Engeset 2016-03-01T00:00:00Z https://doi.org/10.5194/tc-10-535-2016 https://doaj.org/article/9678fb2fb67e4e4bb985e191098485c4 EN eng Copernicus Publications http://www.the-cryosphere.net/10/535/2016/tc-10-535-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-535-2016 https://doaj.org/article/9678fb2fb67e4e4bb985e191098485c4 The Cryosphere, Vol 10, Iss 2, Pp 535-552 (2016) Environmental sciences GE1-350 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/tc-10-535-2016 2022-12-30T22:53:01Z 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 Directory of Open Access Journals: DOAJ Articles Norway The Cryosphere 10 2 535 552 |
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 L. M. Andreassen H. Elvehøy B. Kjøllmoen R. V. Engeset Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 |
L. M. Andreassen H. Elvehøy B. Kjøllmoen R. V. Engeset |
author_facet |
L. M. Andreassen H. Elvehøy B. Kjøllmoen R. V. Engeset |
author_sort |
L. M. Andreassen |
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://doaj.org/article/9678fb2fb67e4e4bb985e191098485c4 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
glacier The Cryosphere |
genre_facet |
glacier The Cryosphere |
op_source |
The Cryosphere, Vol 10, Iss 2, Pp 535-552 (2016) |
op_relation |
http://www.the-cryosphere.net/10/535/2016/tc-10-535-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-535-2016 https://doaj.org/article/9678fb2fb67e4e4bb985e191098485c4 |
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 |
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1766009957992366080 |