Evaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winter
Terrain challenges the prediction of near-surface atmospheric conditions, even in kilometre-scale numerical weather prediction (NWP) models. In this study, the ALADIN-HIRLAM NWP system with 0.5 km horizontal grid spacing and an increased number of vertical levels is compared to the 2.5-km model syst...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/409694 2023-12-03T10:17:04+01:00 Evaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winter Valkonen, Teresa Stoll, Patrick Batrak, Yurri Køltzow, Morten Schneider, Thea Stigter, E.E. Aashamar, Ola Støylen, Eivind Jonassen, Marius Hydrologie Landscape functioning, Geocomputation and Hydrology 2020 application/pdf https://dspace.library.uu.nl/handle/1874/409694 en eng 1600-0870 https://dspace.library.uu.nl/handle/1874/409694 info:eu-repo/semantics/OpenAccess numerical weather prediction atmospheric boundary layer cold-air pool valley channelling Svalbard Article 2020 ftunivutrecht 2023-11-08T23:19:51Z Terrain challenges the prediction of near-surface atmospheric conditions, even in kilometre-scale numerical weather prediction (NWP) models. In this study, the ALADIN-HIRLAM NWP system with 0.5 km horizontal grid spacing and an increased number of vertical levels is compared to the 2.5-km model system similar to the currently operational NWP system at the Norwegian Meteorological Institute. The impact of the increased resolution on the forecasts’ ability to represent boundary-layer processes is investigated for the period from 12 to 16 February 2018 in an Arctic fjord-valley system in the Svalbard archipelago. Model simulations are compared to a wide range of observations conducted during a field campaign. The model configuration with sub-kilometre grid spacing improves both the spatial structure and overall verification scores for the near-surface temperature and wind forecasts compared to the 2.5-km experiment. The subkilometre experiment successfully captures the wind channelling through the valley and the temperature field associated with it. In a situation of a cold-air pool development, the sub-kilometre experiment has a particularly high near-surface temperature bias at low elevations. The use of measurement campaign data, however, reveals some encouraging results, e.g. the sub-kilometre system has a more realistic vertical profile of temperature and wind speed, and the surface temperature sensitivity to the net surface energy is closer to the observations. This work demonstrates the potential of sub-kilometre NWP systems for forecasting weather in complex Arctic terrain, and also suggests that the increase in resolution needs to be accompanied with further development of other parts of the model system. Article in Journal/Newspaper Arctic Svalbard Utrecht University Repository Arctic Svalbard Svalbard Archipelago |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
numerical weather prediction atmospheric boundary layer cold-air pool valley channelling Svalbard |
spellingShingle |
numerical weather prediction atmospheric boundary layer cold-air pool valley channelling Svalbard Valkonen, Teresa Stoll, Patrick Batrak, Yurri Køltzow, Morten Schneider, Thea Stigter, E.E. Aashamar, Ola Støylen, Eivind Jonassen, Marius Evaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winter |
topic_facet |
numerical weather prediction atmospheric boundary layer cold-air pool valley channelling Svalbard |
description |
Terrain challenges the prediction of near-surface atmospheric conditions, even in kilometre-scale numerical weather prediction (NWP) models. In this study, the ALADIN-HIRLAM NWP system with 0.5 km horizontal grid spacing and an increased number of vertical levels is compared to the 2.5-km model system similar to the currently operational NWP system at the Norwegian Meteorological Institute. The impact of the increased resolution on the forecasts’ ability to represent boundary-layer processes is investigated for the period from 12 to 16 February 2018 in an Arctic fjord-valley system in the Svalbard archipelago. Model simulations are compared to a wide range of observations conducted during a field campaign. The model configuration with sub-kilometre grid spacing improves both the spatial structure and overall verification scores for the near-surface temperature and wind forecasts compared to the 2.5-km experiment. The subkilometre experiment successfully captures the wind channelling through the valley and the temperature field associated with it. In a situation of a cold-air pool development, the sub-kilometre experiment has a particularly high near-surface temperature bias at low elevations. The use of measurement campaign data, however, reveals some encouraging results, e.g. the sub-kilometre system has a more realistic vertical profile of temperature and wind speed, and the surface temperature sensitivity to the net surface energy is closer to the observations. This work demonstrates the potential of sub-kilometre NWP systems for forecasting weather in complex Arctic terrain, and also suggests that the increase in resolution needs to be accompanied with further development of other parts of the model system. |
author2 |
Hydrologie Landscape functioning, Geocomputation and Hydrology |
format |
Article in Journal/Newspaper |
author |
Valkonen, Teresa Stoll, Patrick Batrak, Yurri Køltzow, Morten Schneider, Thea Stigter, E.E. Aashamar, Ola Støylen, Eivind Jonassen, Marius |
author_facet |
Valkonen, Teresa Stoll, Patrick Batrak, Yurri Køltzow, Morten Schneider, Thea Stigter, E.E. Aashamar, Ola Støylen, Eivind Jonassen, Marius |
author_sort |
Valkonen, Teresa |
title |
Evaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winter |
title_short |
Evaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winter |
title_full |
Evaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winter |
title_fullStr |
Evaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winter |
title_full_unstemmed |
Evaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winter |
title_sort |
evaluation of a sub-kilometre nwp system in an arctic fjord-valley system in winter |
publishDate |
2020 |
url |
https://dspace.library.uu.nl/handle/1874/409694 |
geographic |
Arctic Svalbard Svalbard Archipelago |
geographic_facet |
Arctic Svalbard Svalbard Archipelago |
genre |
Arctic Svalbard |
genre_facet |
Arctic Svalbard |
op_relation |
1600-0870 https://dspace.library.uu.nl/handle/1874/409694 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1784264022320742400 |