Mass changes in Arctic ice caps and glaciers: implications of regionalizing elevation changes
The mass balance of glaciers and ice caps is sensitive to changing climate conditions. The mass changes derived in this study are determined from elevation changes derived measured by the Ice, Cloud, and land Elevation Satellite (ICESat) for the time period 2003–2009. Four methods, based on interpol...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , |
Format: | Text |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-9-139-2015 https://tc.copernicus.org/articles/9/139/2015/ |
id |
ftcopernicus:oai:publications.copernicus.org:tc22658 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:tc22658 2023-05-15T14:58:41+02:00 Mass changes in Arctic ice caps and glaciers: implications of regionalizing elevation changes Nilsson, J. Sandberg Sørensen, L. Barletta, V. R. Forsberg, R. 2018-09-27 application/pdf https://doi.org/10.5194/tc-9-139-2015 https://tc.copernicus.org/articles/9/139/2015/ eng eng doi:10.5194/tc-9-139-2015 https://tc.copernicus.org/articles/9/139/2015/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-9-139-2015 2020-07-20T16:24:47Z The mass balance of glaciers and ice caps is sensitive to changing climate conditions. The mass changes derived in this study are determined from elevation changes derived measured by the Ice, Cloud, and land Elevation Satellite (ICESat) for the time period 2003–2009. Four methods, based on interpolation and extrapolation, are used to regionalize these elevation changes to areas without satellite coverage. A constant density assumption is then applied to estimate the mass change by integrating over the entire glaciated region. The main purpose of this study is to investigate the sensitivity of the regional mass balance of Arctic ice caps and glaciers to different regionalization schemes. The sensitivity analysis is based on studying the spread of mass changes and their associated errors, and the suitability of the different regionalization techniques is assessed through cross-validation. The cross-validation results shows comparable accuracies for all regionalization methods, but the inferred mass change in individual regions, such as Svalbard and Iceland, can vary up to 4 Gt a −1 , which exceeds the estimated errors by roughly 50% for these regions. This study further finds that this spread in mass balance is connected to the magnitude of the elevation change variability. This indicates that care should be taken when choosing a regionalization method, especially for areas which exhibit large variability in elevation change. Text Arctic Iceland Svalbard Copernicus Publications: E-Journals Arctic Svalbard The Cryosphere 9 1 139 150 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The mass balance of glaciers and ice caps is sensitive to changing climate conditions. The mass changes derived in this study are determined from elevation changes derived measured by the Ice, Cloud, and land Elevation Satellite (ICESat) for the time period 2003–2009. Four methods, based on interpolation and extrapolation, are used to regionalize these elevation changes to areas without satellite coverage. A constant density assumption is then applied to estimate the mass change by integrating over the entire glaciated region. The main purpose of this study is to investigate the sensitivity of the regional mass balance of Arctic ice caps and glaciers to different regionalization schemes. The sensitivity analysis is based on studying the spread of mass changes and their associated errors, and the suitability of the different regionalization techniques is assessed through cross-validation. The cross-validation results shows comparable accuracies for all regionalization methods, but the inferred mass change in individual regions, such as Svalbard and Iceland, can vary up to 4 Gt a −1 , which exceeds the estimated errors by roughly 50% for these regions. This study further finds that this spread in mass balance is connected to the magnitude of the elevation change variability. This indicates that care should be taken when choosing a regionalization method, especially for areas which exhibit large variability in elevation change. |
format |
Text |
author |
Nilsson, J. Sandberg Sørensen, L. Barletta, V. R. Forsberg, R. |
spellingShingle |
Nilsson, J. Sandberg Sørensen, L. Barletta, V. R. Forsberg, R. Mass changes in Arctic ice caps and glaciers: implications of regionalizing elevation changes |
author_facet |
Nilsson, J. Sandberg Sørensen, L. Barletta, V. R. Forsberg, R. |
author_sort |
Nilsson, J. |
title |
Mass changes in Arctic ice caps and glaciers: implications of regionalizing elevation changes |
title_short |
Mass changes in Arctic ice caps and glaciers: implications of regionalizing elevation changes |
title_full |
Mass changes in Arctic ice caps and glaciers: implications of regionalizing elevation changes |
title_fullStr |
Mass changes in Arctic ice caps and glaciers: implications of regionalizing elevation changes |
title_full_unstemmed |
Mass changes in Arctic ice caps and glaciers: implications of regionalizing elevation changes |
title_sort |
mass changes in arctic ice caps and glaciers: implications of regionalizing elevation changes |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-9-139-2015 https://tc.copernicus.org/articles/9/139/2015/ |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Iceland Svalbard |
genre_facet |
Arctic Iceland Svalbard |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-9-139-2015 https://tc.copernicus.org/articles/9/139/2015/ |
op_doi |
https://doi.org/10.5194/tc-9-139-2015 |
container_title |
The Cryosphere |
container_volume |
9 |
container_issue |
1 |
container_start_page |
139 |
op_container_end_page |
150 |
_version_ |
1766330810612318208 |