Estimate of Greenland and Antarctic ice-sheet total discharge from multiple GRACE solutions
In this work a method for the estimation of 2003–2010 monthly-mean total discharge from Greenland and Antarctica is presented. We show that measurements of time-variable gravity from GRACE when combined with estimates of precipitation and sublimation can realistically reconstruct the total discharge...
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ftcopernicus:oai:publications.copernicus.org:tcd74060 2023-05-15T13:55:28+02:00 Estimate of Greenland and Antarctic ice-sheet total discharge from multiple GRACE solutions Russo, Ida Ramillien, Guillaume Frappart, Frédéric Rémy, Frédérique 2019-02-25 application/pdf https://doi.org/10.5194/tc-2019-16 https://tc.copernicus.org/preprints/tc-2019-16/ eng eng doi:10.5194/tc-2019-16 https://tc.copernicus.org/preprints/tc-2019-16/ eISSN: 1994-0424 Text 2019 ftcopernicus https://doi.org/10.5194/tc-2019-16 2020-07-20T16:22:55Z In this work a method for the estimation of 2003–2010 monthly-mean total discharge from Greenland and Antarctica is presented. We show that measurements of time-variable gravity from GRACE when combined with estimates of precipitation and sublimation can realistically reconstruct the total discharge from the ice-sheets into the ocean. In particular, the total discharge has been calculated as a 8-member ensemble-mean obtained by combining multiple GRACE solutions with water fluxes from both an high resolution regional atmospheric climate model (RACMO2) and a global reanalysis (ERA-Interim). The gravimetric measurements of mass variations and the precipitation and sublimation atmospheric fields have been combined in the ice-sheets water mass balance equation, according to the main drainage basin systems. The use of the combined land-atmosphere water mass balance has also been tested, which however led to a large underestimation of total discharge. A comparison among the different GRACE solutions is also performed, highlighting similarities and differences and analyzing the possible causes. GRACE datasets show similar ice-sheet mass trends on Antarctica and over the majority of the Greenland basins, while significant differences (up to a factor of 1.9) have been found in mass-loss areas characterized by strongly negative water height trends. This is likely primarily caused by the different pre-processing techniques applied to the raw gravimetric data. Text Antarc* Antarctic Antarctica Greenland Ice Sheet Copernicus Publications: E-Journals Antarctic Greenland |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
In this work a method for the estimation of 2003–2010 monthly-mean total discharge from Greenland and Antarctica is presented. We show that measurements of time-variable gravity from GRACE when combined with estimates of precipitation and sublimation can realistically reconstruct the total discharge from the ice-sheets into the ocean. In particular, the total discharge has been calculated as a 8-member ensemble-mean obtained by combining multiple GRACE solutions with water fluxes from both an high resolution regional atmospheric climate model (RACMO2) and a global reanalysis (ERA-Interim). The gravimetric measurements of mass variations and the precipitation and sublimation atmospheric fields have been combined in the ice-sheets water mass balance equation, according to the main drainage basin systems. The use of the combined land-atmosphere water mass balance has also been tested, which however led to a large underestimation of total discharge. A comparison among the different GRACE solutions is also performed, highlighting similarities and differences and analyzing the possible causes. GRACE datasets show similar ice-sheet mass trends on Antarctica and over the majority of the Greenland basins, while significant differences (up to a factor of 1.9) have been found in mass-loss areas characterized by strongly negative water height trends. This is likely primarily caused by the different pre-processing techniques applied to the raw gravimetric data. |
format |
Text |
author |
Russo, Ida Ramillien, Guillaume Frappart, Frédéric Rémy, Frédérique |
spellingShingle |
Russo, Ida Ramillien, Guillaume Frappart, Frédéric Rémy, Frédérique Estimate of Greenland and Antarctic ice-sheet total discharge from multiple GRACE solutions |
author_facet |
Russo, Ida Ramillien, Guillaume Frappart, Frédéric Rémy, Frédérique |
author_sort |
Russo, Ida |
title |
Estimate of Greenland and Antarctic ice-sheet total discharge from multiple GRACE solutions |
title_short |
Estimate of Greenland and Antarctic ice-sheet total discharge from multiple GRACE solutions |
title_full |
Estimate of Greenland and Antarctic ice-sheet total discharge from multiple GRACE solutions |
title_fullStr |
Estimate of Greenland and Antarctic ice-sheet total discharge from multiple GRACE solutions |
title_full_unstemmed |
Estimate of Greenland and Antarctic ice-sheet total discharge from multiple GRACE solutions |
title_sort |
estimate of greenland and antarctic ice-sheet total discharge from multiple grace solutions |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-2019-16 https://tc.copernicus.org/preprints/tc-2019-16/ |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Antarctica Greenland Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Greenland Ice Sheet |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2019-16 https://tc.copernicus.org/preprints/tc-2019-16/ |
op_doi |
https://doi.org/10.5194/tc-2019-16 |
_version_ |
1766262117734809600 |