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dc.contributor.authorValkonen, Teresa Maaria
dc.contributor.authorStoll, Patrick
dc.contributor.authorBatrak, Yurii
dc.contributor.authorKøltzow, Morten Andreas Ødegaard
dc.contributor.authorSchneider, Thea Maria
dc.contributor.authorStigter, Emmy E.
dc.contributor.authorAashamar, Ola B.
dc.contributor.authorStøylen, Eivind
dc.contributor.authorJonassen, Marius Opsanger
dc.date.accessioned2021-11-01T08:58:21Z
dc.date.available2021-11-01T08:58:21Z
dc.date.issued2020-10-28
dc.description.abstractTerrain 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.en_US
dc.identifier.citationValkonen TM, Stoll P, Batrak, Køltzow M, Schneider, Stigter, Aashamar, Støylen, Jonassen MO. Evaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winter. Tellus. Series A, Dynamic meteorology and oceanography. 2020;72(1):1-21en_US
dc.identifier.cristinIDFRIDAID 1881645
dc.identifier.doi10.1080/16000870.2020.1838181
dc.identifier.issn0280-6495
dc.identifier.issn1600-0870
dc.identifier.urihttps://hdl.handle.net/10037/22892
dc.language.isoengen_US
dc.publisherTaylor & Francisen_US
dc.relation.journalTellus. Series A, Dynamic meteorology and oceanography
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/POLARPROG/280573/Norway/Advanced models and weather prediction in the Arctic: Enhanced capacity from observations and polar process representations/ALERTNESS/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2020 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430en_US
dc.titleEvaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winteren_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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