Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation
A simulation of 51 years (1957–2008) has been performed over Greenland using the regional atmospheric climate model (RACMO2/GR) at a horizontal grid spacing of 11 km and forced by ECMWF re-analysis products. To better represent processes affecting ice sheet surface mass balance, such as meltwater re...
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ftcopernicus:oai:publications.copernicus.org:tc7269 2023-05-15T16:27:51+02:00 Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation Ettema, J. Broeke, M. R. Meijgaard, E. Berg, W. J. Box, J. E. Steffen, K. 2018-09-27 application/pdf https://doi.org/10.5194/tc-4-511-2010 https://tc.copernicus.org/articles/4/511/2010/ eng eng doi:10.5194/tc-4-511-2010 https://tc.copernicus.org/articles/4/511/2010/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-4-511-2010 2020-07-20T16:26:15Z A simulation of 51 years (1957–2008) has been performed over Greenland using the regional atmospheric climate model (RACMO2/GR) at a horizontal grid spacing of 11 km and forced by ECMWF re-analysis products. To better represent processes affecting ice sheet surface mass balance, such as meltwater refreezing and penetration, an additional snow/ice surface module has been developed and implemented into the surface part of the climate model. The temporal evolution and climatology of the model is evaluated with in situ coastal and ice sheet atmospheric measurements of near-surface variables and surface energy balance components. The bias for the near-surface air temperature (−0.8 °C), specific humidity (0.1 g kg −1 ), wind speed (0.3 m s −1 ) as well as for radiative (2.5 W m −2 for net radiation) and turbulent heat fluxes shows that the model is in good accordance with available observations on and around the ice sheet. The modelled surface energy budget underestimates the downward longwave radiation and overestimates the sensible heat flux. Due to their compensating effect, the averaged 2 m temperature bias is small and the katabatic wind circulation well captured by the model. Text Greenland Ice Sheet Copernicus Publications: E-Journals Greenland The Cryosphere 4 4 511 527 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
A simulation of 51 years (1957–2008) has been performed over Greenland using the regional atmospheric climate model (RACMO2/GR) at a horizontal grid spacing of 11 km and forced by ECMWF re-analysis products. To better represent processes affecting ice sheet surface mass balance, such as meltwater refreezing and penetration, an additional snow/ice surface module has been developed and implemented into the surface part of the climate model. The temporal evolution and climatology of the model is evaluated with in situ coastal and ice sheet atmospheric measurements of near-surface variables and surface energy balance components. The bias for the near-surface air temperature (−0.8 °C), specific humidity (0.1 g kg −1 ), wind speed (0.3 m s −1 ) as well as for radiative (2.5 W m −2 for net radiation) and turbulent heat fluxes shows that the model is in good accordance with available observations on and around the ice sheet. The modelled surface energy budget underestimates the downward longwave radiation and overestimates the sensible heat flux. Due to their compensating effect, the averaged 2 m temperature bias is small and the katabatic wind circulation well captured by the model. |
format |
Text |
author |
Ettema, J. Broeke, M. R. Meijgaard, E. Berg, W. J. Box, J. E. Steffen, K. |
spellingShingle |
Ettema, J. Broeke, M. R. Meijgaard, E. Berg, W. J. Box, J. E. Steffen, K. Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation |
author_facet |
Ettema, J. Broeke, M. R. Meijgaard, E. Berg, W. J. Box, J. E. Steffen, K. |
author_sort |
Ettema, J. |
title |
Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation |
title_short |
Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation |
title_full |
Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation |
title_fullStr |
Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation |
title_full_unstemmed |
Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation |
title_sort |
climate of the greenland ice sheet using a high-resolution climate model – part 1: evaluation |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-4-511-2010 https://tc.copernicus.org/articles/4/511/2010/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-4-511-2010 https://tc.copernicus.org/articles/4/511/2010/ |
op_doi |
https://doi.org/10.5194/tc-4-511-2010 |
container_title |
The Cryosphere |
container_volume |
4 |
container_issue |
4 |
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511 |
op_container_end_page |
527 |
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1766017410251358208 |