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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Cambridge University Press
2016
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Online Access: | https://eprints.whiterose.ac.uk/110422/ https://eprints.whiterose.ac.uk/110422/1/high-resolution-1-km-positive-degree-day-modelling-of-greenland-ice-sheet-surface-mass-balance-1870-2012-using-reanalysis-data-div.pdf https://doi.org/10.1017/jog.2016.133 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:110422 2023-05-15T16:27:59+02:00 High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870–2012 using reanalysis data Wilton, D.J. Jowett, A. Hanna, E. Bigg, G.R. Van Den Broeke, M.R. Fettweis, X. Huybrechts, P. 2016-12-15 text https://eprints.whiterose.ac.uk/110422/ https://eprints.whiterose.ac.uk/110422/1/high-resolution-1-km-positive-degree-day-modelling-of-greenland-ice-sheet-surface-mass-balance-1870-2012-using-reanalysis-data-div.pdf https://doi.org/10.1017/jog.2016.133 en eng Cambridge University Press https://eprints.whiterose.ac.uk/110422/1/high-resolution-1-km-positive-degree-day-modelling-of-greenland-ice-sheet-surface-mass-balance-1870-2012-using-reanalysis-data-div.pdf Wilton, D.J., Jowett, A., Hanna, E. et al. (4 more authors) (2016) High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870–2012 using reanalysis data. Journal of Glaciology. ISSN 0022-1430 cc_by_4 CC-BY Article PeerReviewed 2016 ftleedsuniv https://doi.org/10.1017/jog.2016.133 2023-01-30T21:50:26Z 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 Greenland Ice Sheet Journal of Glaciology White Rose Research Online (Universities of Leeds, Sheffield & York) Greenland Journal of Glaciology 63 237 176 193 |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
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. |
format |
Article in Journal/Newspaper |
author |
Wilton, D.J. Jowett, A. Hanna, E. Bigg, G.R. Van Den Broeke, M.R. Fettweis, X. Huybrechts, P. |
spellingShingle |
Wilton, D.J. Jowett, A. Hanna, E. Bigg, G.R. Van Den Broeke, M.R. Fettweis, X. Huybrechts, P. High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870–2012 using reanalysis data |
author_facet |
Wilton, D.J. Jowett, A. Hanna, E. Bigg, G.R. Van Den Broeke, M.R. Fettweis, X. Huybrechts, P. |
author_sort |
Wilton, D.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 |
publisher |
Cambridge University Press |
publishDate |
2016 |
url |
https://eprints.whiterose.ac.uk/110422/ https://eprints.whiterose.ac.uk/110422/1/high-resolution-1-km-positive-degree-day-modelling-of-greenland-ice-sheet-surface-mass-balance-1870-2012-using-reanalysis-data-div.pdf https://doi.org/10.1017/jog.2016.133 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet Journal of Glaciology |
genre_facet |
Greenland Ice Sheet Journal of Glaciology |
op_relation |
https://eprints.whiterose.ac.uk/110422/1/high-resolution-1-km-positive-degree-day-modelling-of-greenland-ice-sheet-surface-mass-balance-1870-2012-using-reanalysis-data-div.pdf Wilton, D.J., Jowett, A., Hanna, E. et al. (4 more authors) (2016) High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870–2012 using reanalysis data. Journal of Glaciology. ISSN 0022-1430 |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/jog.2016.133 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
237 |
container_start_page |
176 |
op_container_end_page |
193 |
_version_ |
1766017590941974528 |