Brief communication: Surface energy balance differences over Greenland between ERA5 and ERA-Interim
We compare the main atmospheric drivers of the melt season over the Greenland Ice Sheet (GrIS) in ERA5 and ERA-Interim (ERAI) in their overlapping period 1979–2018. In summer, ERA5 differs significantly from ERAI, especially in the melt regions. Small-scale ERA5 − ERAI differences near the ice sheet...
Published in: | The Cryosphere |
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Copernicus Publications
2023
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Online Access: | https://epic.awi.de/id/eprint/58750/ https://epic.awi.de/id/eprint/58750/1/tc-17-5131-2023.pdf https://doi.org/10.5194/tc-17-5131-2023 https://hdl.handle.net/10013/epic.a369dd0c-4413-4aaa-ae79-948ccd879c95 |
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ftawi:oai:epic.awi.de:58750 2024-06-02T08:07:24+00:00 Brief communication: Surface energy balance differences over Greenland between ERA5 and ERA-Interim Krebs-Kanzow, Uta Rodehacke, Christian B Lohmann, Gerrit Robinson, Alexander 2023-12-06 application/pdf https://epic.awi.de/id/eprint/58750/ https://epic.awi.de/id/eprint/58750/1/tc-17-5131-2023.pdf https://doi.org/10.5194/tc-17-5131-2023 https://hdl.handle.net/10013/epic.a369dd0c-4413-4aaa-ae79-948ccd879c95 unknown Copernicus Publications https://epic.awi.de/id/eprint/58750/1/tc-17-5131-2023.pdf Krebs-Kanzow, U. orcid:0000-0002-3244-6491 , Rodehacke, C. B. orcid:0000-0003-3110-3857 and Lohmann, G. orcid:0000-0003-2089-733X (2023) Brief communication: Surface energy balance differences over Greenland between ERA5 and ERA-Interim / A. Robinson (editor) , The Cryosphere, 17 (12), pp. 5131-5136 . doi:10.5194/tc-17-5131-2023 <https://doi.org/10.5194/tc-17-5131-2023> , hdl:10013/epic.a369dd0c-4413-4aaa-ae79-948ccd879c95 EPIC3The Cryosphere, Copernicus Publications, 17(12), pp. 5131-5136, ISSN: 1994-0416 Article isiRev 2023 ftawi https://doi.org/10.5194/tc-17-5131-2023 2024-05-07T23:37:52Z We compare the main atmospheric drivers of the melt season over the Greenland Ice Sheet (GrIS) in ERA5 and ERA-Interim (ERAI) in their overlapping period 1979–2018. In summer, ERA5 differs significantly from ERAI, especially in the melt regions. Small-scale ERA5 − ERAI differences near the ice sheet’s margins and over steep slopes can be explained by the different resolution, while the large-scale differences indicate a different representation of physical processes in the two reanalyses: averaged over the lower parts of the GrIS, the mean near-surface air temperature is 1 K lower, while the mean downward shortwave radiation at the surface is on average 15 W m−2 higher than in ERAI. Comparison with observational weather station data shows a significant warm bias in ERAI and, for ERA5, a significant positive bias in downward shortwave radiation. Consequently, methods that previously estimated the GrIS surface mass balance from the ERAI surface energy balance need to be carefully recalibrated before converting to ERA5 forcing. Article in Journal/Newspaper Greenland Ice Sheet The Cryosphere Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland The Cryosphere 17 12 5131 5136 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
We compare the main atmospheric drivers of the melt season over the Greenland Ice Sheet (GrIS) in ERA5 and ERA-Interim (ERAI) in their overlapping period 1979–2018. In summer, ERA5 differs significantly from ERAI, especially in the melt regions. Small-scale ERA5 − ERAI differences near the ice sheet’s margins and over steep slopes can be explained by the different resolution, while the large-scale differences indicate a different representation of physical processes in the two reanalyses: averaged over the lower parts of the GrIS, the mean near-surface air temperature is 1 K lower, while the mean downward shortwave radiation at the surface is on average 15 W m−2 higher than in ERAI. Comparison with observational weather station data shows a significant warm bias in ERAI and, for ERA5, a significant positive bias in downward shortwave radiation. Consequently, methods that previously estimated the GrIS surface mass balance from the ERAI surface energy balance need to be carefully recalibrated before converting to ERA5 forcing. |
author2 |
Robinson, Alexander |
format |
Article in Journal/Newspaper |
author |
Krebs-Kanzow, Uta Rodehacke, Christian B Lohmann, Gerrit |
spellingShingle |
Krebs-Kanzow, Uta Rodehacke, Christian B Lohmann, Gerrit Brief communication: Surface energy balance differences over Greenland between ERA5 and ERA-Interim |
author_facet |
Krebs-Kanzow, Uta Rodehacke, Christian B Lohmann, Gerrit |
author_sort |
Krebs-Kanzow, Uta |
title |
Brief communication: Surface energy balance differences over Greenland between ERA5 and ERA-Interim |
title_short |
Brief communication: Surface energy balance differences over Greenland between ERA5 and ERA-Interim |
title_full |
Brief communication: Surface energy balance differences over Greenland between ERA5 and ERA-Interim |
title_fullStr |
Brief communication: Surface energy balance differences over Greenland between ERA5 and ERA-Interim |
title_full_unstemmed |
Brief communication: Surface energy balance differences over Greenland between ERA5 and ERA-Interim |
title_sort |
brief communication: surface energy balance differences over greenland between era5 and era-interim |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://epic.awi.de/id/eprint/58750/ https://epic.awi.de/id/eprint/58750/1/tc-17-5131-2023.pdf https://doi.org/10.5194/tc-17-5131-2023 https://hdl.handle.net/10013/epic.a369dd0c-4413-4aaa-ae79-948ccd879c95 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet The Cryosphere |
genre_facet |
Greenland Ice Sheet The Cryosphere |
op_source |
EPIC3The Cryosphere, Copernicus Publications, 17(12), pp. 5131-5136, ISSN: 1994-0416 |
op_relation |
https://epic.awi.de/id/eprint/58750/1/tc-17-5131-2023.pdf Krebs-Kanzow, U. orcid:0000-0002-3244-6491 , Rodehacke, C. B. orcid:0000-0003-3110-3857 and Lohmann, G. orcid:0000-0003-2089-733X (2023) Brief communication: Surface energy balance differences over Greenland between ERA5 and ERA-Interim / A. Robinson (editor) , The Cryosphere, 17 (12), pp. 5131-5136 . doi:10.5194/tc-17-5131-2023 <https://doi.org/10.5194/tc-17-5131-2023> , hdl:10013/epic.a369dd0c-4413-4aaa-ae79-948ccd879c95 |
op_doi |
https://doi.org/10.5194/tc-17-5131-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
12 |
container_start_page |
5131 |
op_container_end_page |
5136 |
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1800752482732736512 |