Scatter of mass changes estimates at basin scale for Greenland and Antarctica
During the last decade, the GRACE mission has provided valuable data for determining the mass changes of the Greenland and Antarctic ice sheets. Yet, discrepancies still exist in the published mass balance results, and comprehensive analyses on the sources of errors and discrepancies are lacking. He...
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ftdoajarticles:oai:doaj.org/article:f194dd8c3620425abc7da2a61ef62eeb 2023-05-15T14:04:43+02:00 Scatter of mass changes estimates at basin scale for Greenland and Antarctica V. R. Barletta L. S. Sørensen R. Forsberg 2013-09-01T00:00:00Z https://doi.org/10.5194/tc-7-1411-2013 https://doaj.org/article/f194dd8c3620425abc7da2a61ef62eeb EN eng Copernicus Publications http://www.the-cryosphere.net/7/1411/2013/tc-7-1411-2013.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-7-1411-2013 1994-0416 1994-0424 https://doaj.org/article/f194dd8c3620425abc7da2a61ef62eeb The Cryosphere, Vol 7, Iss 5, Pp 1411-1432 (2013) Environmental sciences GE1-350 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/tc-7-1411-2013 2022-12-31T00:26:29Z During the last decade, the GRACE mission has provided valuable data for determining the mass changes of the Greenland and Antarctic ice sheets. Yet, discrepancies still exist in the published mass balance results, and comprehensive analyses on the sources of errors and discrepancies are lacking. Here, we present monthly mass changes together with trends derived from GRACE data at basin scale for both the Greenland and Antarctic ice sheets, and we assess the variability and errors for each of the possible sources of discrepancies, and we do this in an unprecedented systematic way, taking into account mass inference methods, data sets and background models. We find a very good agreement between the monthly mass change results derived from two independent methods, which represents a cross validation. For the monthly solutions, we find that most of the scatter is caused by the use of the two different data sets rather than the two different methods applied. Besides the well-known GIA trend uncertainty, we find that the geocenter motion and the recent de-aliasing corrections significantly impact the trends, with contributions of +13.2 Gt yr −1 and −20 Gt yr −1 , respectively, for Antarctica, which is more affected by these than Greenland. We show differences between the use of release RL04 and the new RL05 and confirm a lower noise content in the new release. The overall scatter of the solutions well exceeds the uncertainties propagated from the data errors and the leakage (as done in the past); hence we calculate new sound total errors for the monthly solutions and the trends. We find that the scatter in the monthly solutions caused by applying different estimates of geocenter motion time series (degree-1 corrections) is significant – contributing with up to 40% of the total error. For the whole GRACE period (2003–2011) our trend estimate for Greenland is −234 ± 20 Gt yr −1 and −83 ± 36 Gt yr −1 for Antarctica (−111 ± 15 Gt yr −1 in the western part). We also find a clear (with respect to our errors) increase of ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic Greenland The Cryosphere 7 5 1411 1432 |
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 V. R. Barletta L. S. Sørensen R. Forsberg Scatter of mass changes estimates at basin scale for Greenland and Antarctica |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
During the last decade, the GRACE mission has provided valuable data for determining the mass changes of the Greenland and Antarctic ice sheets. Yet, discrepancies still exist in the published mass balance results, and comprehensive analyses on the sources of errors and discrepancies are lacking. Here, we present monthly mass changes together with trends derived from GRACE data at basin scale for both the Greenland and Antarctic ice sheets, and we assess the variability and errors for each of the possible sources of discrepancies, and we do this in an unprecedented systematic way, taking into account mass inference methods, data sets and background models. We find a very good agreement between the monthly mass change results derived from two independent methods, which represents a cross validation. For the monthly solutions, we find that most of the scatter is caused by the use of the two different data sets rather than the two different methods applied. Besides the well-known GIA trend uncertainty, we find that the geocenter motion and the recent de-aliasing corrections significantly impact the trends, with contributions of +13.2 Gt yr −1 and −20 Gt yr −1 , respectively, for Antarctica, which is more affected by these than Greenland. We show differences between the use of release RL04 and the new RL05 and confirm a lower noise content in the new release. The overall scatter of the solutions well exceeds the uncertainties propagated from the data errors and the leakage (as done in the past); hence we calculate new sound total errors for the monthly solutions and the trends. We find that the scatter in the monthly solutions caused by applying different estimates of geocenter motion time series (degree-1 corrections) is significant – contributing with up to 40% of the total error. For the whole GRACE period (2003–2011) our trend estimate for Greenland is −234 ± 20 Gt yr −1 and −83 ± 36 Gt yr −1 for Antarctica (−111 ± 15 Gt yr −1 in the western part). We also find a clear (with respect to our errors) increase of ... |
format |
Article in Journal/Newspaper |
author |
V. R. Barletta L. S. Sørensen R. Forsberg |
author_facet |
V. R. Barletta L. S. Sørensen R. Forsberg |
author_sort |
V. R. Barletta |
title |
Scatter of mass changes estimates at basin scale for Greenland and Antarctica |
title_short |
Scatter of mass changes estimates at basin scale for Greenland and Antarctica |
title_full |
Scatter of mass changes estimates at basin scale for Greenland and Antarctica |
title_fullStr |
Scatter of mass changes estimates at basin scale for Greenland and Antarctica |
title_full_unstemmed |
Scatter of mass changes estimates at basin scale for Greenland and Antarctica |
title_sort |
scatter of mass changes estimates at basin scale for greenland and antarctica |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/tc-7-1411-2013 https://doaj.org/article/f194dd8c3620425abc7da2a61ef62eeb |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Antarctica Greenland The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Greenland The Cryosphere |
op_source |
The Cryosphere, Vol 7, Iss 5, Pp 1411-1432 (2013) |
op_relation |
http://www.the-cryosphere.net/7/1411/2013/tc-7-1411-2013.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-7-1411-2013 1994-0416 1994-0424 https://doaj.org/article/f194dd8c3620425abc7da2a61ef62eeb |
op_doi |
https://doi.org/10.5194/tc-7-1411-2013 |
container_title |
The Cryosphere |
container_volume |
7 |
container_issue |
5 |
container_start_page |
1411 |
op_container_end_page |
1432 |
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1766275962038648832 |