High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870-2012 using reanalysis data
We show results from a positive degree-day (PDD) model of Greenland ice sheet (GrIS) surface mass balance (SMB), 1870-2012, forced with reanalysis data. The model includes an improved daily temperature parameterization as compared with a previous version and is run at 1 km rather than 5 km resolutio...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/352020 2023-07-23T04:17:56+02:00 High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870-2012 using reanalysis data Wilton, David J. Jowett, Amy Hanna, Edward Bigg, Grant R. Van Den Broeke, Michiel R. Fettweis, Xavier Huybrechts, Philippe Sub Dynamics Meteorology Marine and Atmospheric Research 2017-02-01 image/pdf https://dspace.library.uu.nl/handle/1874/352020 en eng 0022-1430 https://dspace.library.uu.nl/handle/1874/352020 info:eu-repo/semantics/OpenAccess arctic glaciology ice-sheet mass balance mass-balance reconstruction Earth-Surface Processes Article 2017 ftunivutrecht 2023-07-02T02:09:46Z We show results from a positive degree-day (PDD) model of Greenland ice sheet (GrIS) surface mass balance (SMB), 1870-2012, forced with reanalysis data. The model includes an improved daily temperature parameterization as compared with a previous version and is run at 1 km rather than 5 km resolution. The improvements lead overall to higher SMB with the same forcing data. We also compare our model with results from two regional climate models (RCMs). While there is good qualitative agreement between our PDD model and the RCMs, it usually results in lower precipitation and lower runoff but approximately equivalent SMB: mean 1979-2012 SMB (± standard deviation), in Gt a-1, is 382 ± 78 in the PDD model, compared with 379 ± 101 and 425 ± 90 for the RCMs. Comparison with in situ SMB observations suggests that the RCMs may be more accurate than PDD at local level, in some areas, although the latter generally compares well. Dividing the GrIS into seven drainage basins we show that SMB has decreased sharply in all regions since 2000. Finally we show correlation between runoff close to two calving glaciers and either calving front retreat or calving flux, this being most noticeable from the mid-1990s. Article in Journal/Newspaper Arctic Greenland Ice Sheet Utrecht University Repository Arctic Greenland |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
arctic glaciology ice-sheet mass balance mass-balance reconstruction Earth-Surface Processes |
spellingShingle |
arctic glaciology ice-sheet mass balance mass-balance reconstruction Earth-Surface Processes Wilton, David J. Jowett, Amy Hanna, Edward Bigg, Grant R. Van Den Broeke, Michiel R. Fettweis, Xavier Huybrechts, Philippe High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870-2012 using reanalysis data |
topic_facet |
arctic glaciology ice-sheet mass balance mass-balance reconstruction Earth-Surface Processes |
description |
We show results from a positive degree-day (PDD) model of Greenland ice sheet (GrIS) surface mass balance (SMB), 1870-2012, forced with reanalysis data. The model includes an improved daily temperature parameterization as compared with a previous version and is run at 1 km rather than 5 km resolution. The improvements lead overall to higher SMB with the same forcing data. We also compare our model with results from two regional climate models (RCMs). While there is good qualitative agreement between our PDD model and the RCMs, it usually results in lower precipitation and lower runoff but approximately equivalent SMB: mean 1979-2012 SMB (± standard deviation), in Gt a-1, is 382 ± 78 in the PDD model, compared with 379 ± 101 and 425 ± 90 for the RCMs. Comparison with in situ SMB observations suggests that the RCMs may be more accurate than PDD at local level, in some areas, although the latter generally compares well. Dividing the GrIS into seven drainage basins we show that SMB has decreased sharply in all regions since 2000. Finally we show correlation between runoff close to two calving glaciers and either calving front retreat or calving flux, this being most noticeable from the mid-1990s. |
author2 |
Sub Dynamics Meteorology Marine and Atmospheric Research |
format |
Article in Journal/Newspaper |
author |
Wilton, David J. Jowett, Amy Hanna, Edward Bigg, Grant R. Van Den Broeke, Michiel R. Fettweis, Xavier Huybrechts, Philippe |
author_facet |
Wilton, David J. Jowett, Amy Hanna, Edward Bigg, Grant R. Van Den Broeke, Michiel R. Fettweis, Xavier Huybrechts, Philippe |
author_sort |
Wilton, David J. |
title |
High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870-2012 using reanalysis data |
title_short |
High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870-2012 using reanalysis data |
title_full |
High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870-2012 using reanalysis data |
title_fullStr |
High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870-2012 using reanalysis data |
title_full_unstemmed |
High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870-2012 using reanalysis data |
title_sort |
high resolution (1 km) positive degree-day modelling of greenland ice sheet surface mass balance, 1870-2012 using reanalysis data |
publishDate |
2017 |
url |
https://dspace.library.uu.nl/handle/1874/352020 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Ice Sheet |
genre_facet |
Arctic Greenland Ice Sheet |
op_relation |
0022-1430 https://dspace.library.uu.nl/handle/1874/352020 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772180028134522880 |