Value of the Copernicus Arctic Regional Reanalysis (CARRA) in representing near-surface temperature and wind speed in the north-east European Arctic
The representation of 2-m air temperature and 10-m wind speed in the high-resolution (with a 2.5-km grid spacing) Copernicus Arctic Regional Reanalysis (CARRA) and the coarser resolution (ca. 31-km grid spacing) global European Center for Medium-range Weather Forecasts fifth-generation reanalysis (E...
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Norwegian Polar Institute
2022
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Online Access: | https://polarresearch.net/index.php/polar/article/view/8002 https://doi.org/10.33265/polar.v41.8002 |
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ftjpolarres:oai:journals.openacademia.net:article/8002 2023-05-15T14:55:52+02:00 Value of the Copernicus Arctic Regional Reanalysis (CARRA) in representing near-surface temperature and wind speed in the north-east European Arctic Køltzow, Morten Schyberg, Harald Støylen, Eivind Yang, Xiaohua 2022-03-31 text/html application/pdf application/epub+zip text/xml https://polarresearch.net/index.php/polar/article/view/8002 https://doi.org/10.33265/polar.v41.8002 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/8002/14479 https://polarresearch.net/index.php/polar/article/view/8002/14482 https://polarresearch.net/index.php/polar/article/view/8002/14480 https://polarresearch.net/index.php/polar/article/view/8002/14481 https://polarresearch.net/index.php/polar/article/view/8002 doi:10.33265/polar.v41.8002 Copyright (c) 2022 Morten Køltzow, Harald Schyberg, Eivind Støylen, Xiaohua Yang https://creativecommons.org/licenses/by-nc/4.0 CC-BY-NC Polar Research; Vol. 41 (2022) 1751-8369 High-resolution weather climate polar low northern Fennoscandia Svalbard info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftjpolarres https://doi.org/10.33265/polar.v41.8002 2023-01-04T23:49:34Z The representation of 2-m air temperature and 10-m wind speed in the high-resolution (with a 2.5-km grid spacing) Copernicus Arctic Regional Reanalysis (CARRA) and the coarser resolution (ca. 31-km grid spacing) global European Center for Medium-range Weather Forecasts fifth-generation reanalysis (ERA5) for Svalbard, northern Norway, Sweden and Finland is evaluated against observations. The largest differences between the two reanalyses are found in regions with complex terrain and coastlines, and over the sea ice for temperature in winter. In most aspects, CARRA outperforms ERA5 in its agreement with the observations, but the value added by CARRA varies with region and season. Furthermore, the added value by CARRA is seen for both parameters but is more pronounced for temperature than wind speed. CARRA is in better agreement with observations in terms of general evaluation metrics like bias and standard deviation of the errors, is more similar to the observed spatial and temporal variability and better captures local extremes. A better representation of high-impact weather like polar lows, vessel icing and warm spells during winter is also demonstrated. Finally, it is shown that a substantial part of the difference between reanalyses and observations is due to representativeness issues, that is, sub-grid variability, which cannot be represented in gridded data. This representativeness error is larger in ERA5 than in CARRA, but the fraction of the total error is estimated to be similar in the two analyses for temperature but larger in ERA5 for wind speed. Article in Journal/Newspaper Arctic Fennoscandia Northern Norway Polar Research Sea ice Svalbard Polar Research (E-Journal) Arctic Norway Svalbard Polar Research 41 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
topic |
High-resolution weather climate polar low northern Fennoscandia Svalbard |
spellingShingle |
High-resolution weather climate polar low northern Fennoscandia Svalbard Køltzow, Morten Schyberg, Harald Støylen, Eivind Yang, Xiaohua Value of the Copernicus Arctic Regional Reanalysis (CARRA) in representing near-surface temperature and wind speed in the north-east European Arctic |
topic_facet |
High-resolution weather climate polar low northern Fennoscandia Svalbard |
description |
The representation of 2-m air temperature and 10-m wind speed in the high-resolution (with a 2.5-km grid spacing) Copernicus Arctic Regional Reanalysis (CARRA) and the coarser resolution (ca. 31-km grid spacing) global European Center for Medium-range Weather Forecasts fifth-generation reanalysis (ERA5) for Svalbard, northern Norway, Sweden and Finland is evaluated against observations. The largest differences between the two reanalyses are found in regions with complex terrain and coastlines, and over the sea ice for temperature in winter. In most aspects, CARRA outperforms ERA5 in its agreement with the observations, but the value added by CARRA varies with region and season. Furthermore, the added value by CARRA is seen for both parameters but is more pronounced for temperature than wind speed. CARRA is in better agreement with observations in terms of general evaluation metrics like bias and standard deviation of the errors, is more similar to the observed spatial and temporal variability and better captures local extremes. A better representation of high-impact weather like polar lows, vessel icing and warm spells during winter is also demonstrated. Finally, it is shown that a substantial part of the difference between reanalyses and observations is due to representativeness issues, that is, sub-grid variability, which cannot be represented in gridded data. This representativeness error is larger in ERA5 than in CARRA, but the fraction of the total error is estimated to be similar in the two analyses for temperature but larger in ERA5 for wind speed. |
format |
Article in Journal/Newspaper |
author |
Køltzow, Morten Schyberg, Harald Støylen, Eivind Yang, Xiaohua |
author_facet |
Køltzow, Morten Schyberg, Harald Støylen, Eivind Yang, Xiaohua |
author_sort |
Køltzow, Morten |
title |
Value of the Copernicus Arctic Regional Reanalysis (CARRA) in representing near-surface temperature and wind speed in the north-east European Arctic |
title_short |
Value of the Copernicus Arctic Regional Reanalysis (CARRA) in representing near-surface temperature and wind speed in the north-east European Arctic |
title_full |
Value of the Copernicus Arctic Regional Reanalysis (CARRA) in representing near-surface temperature and wind speed in the north-east European Arctic |
title_fullStr |
Value of the Copernicus Arctic Regional Reanalysis (CARRA) in representing near-surface temperature and wind speed in the north-east European Arctic |
title_full_unstemmed |
Value of the Copernicus Arctic Regional Reanalysis (CARRA) in representing near-surface temperature and wind speed in the north-east European Arctic |
title_sort |
value of the copernicus arctic regional reanalysis (carra) in representing near-surface temperature and wind speed in the north-east european arctic |
publisher |
Norwegian Polar Institute |
publishDate |
2022 |
url |
https://polarresearch.net/index.php/polar/article/view/8002 https://doi.org/10.33265/polar.v41.8002 |
geographic |
Arctic Norway Svalbard |
geographic_facet |
Arctic Norway Svalbard |
genre |
Arctic Fennoscandia Northern Norway Polar Research Sea ice Svalbard |
genre_facet |
Arctic Fennoscandia Northern Norway Polar Research Sea ice Svalbard |
op_source |
Polar Research; Vol. 41 (2022) 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/8002/14479 https://polarresearch.net/index.php/polar/article/view/8002/14482 https://polarresearch.net/index.php/polar/article/view/8002/14480 https://polarresearch.net/index.php/polar/article/view/8002/14481 https://polarresearch.net/index.php/polar/article/view/8002 doi:10.33265/polar.v41.8002 |
op_rights |
Copyright (c) 2022 Morten Køltzow, Harald Schyberg, Eivind Støylen, Xiaohua Yang https://creativecommons.org/licenses/by-nc/4.0 |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.33265/polar.v41.8002 |
container_title |
Polar Research |
container_volume |
41 |
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1766327874019655680 |