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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.PublishedTellus. Series A, Dynamic meteorology and oceanography. 2020, 72 (1), 1-21.
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 sub-kilometre 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.publisherTaylor & Francisen_US
dc.rightsNavngivelse-Ikkekommersiell 4.0 Internasjonal*
dc.titleEvaluation of a sub-kilometre NWP system in an Arctic fjord-valley system in winteren_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.rights.holderCopyright 2020 The Author(s).en_US
dc.source.journalTellus. Series A, Dynamic meteorology and oceanographyen_US
dc.identifier.citationTellus. Series A, Dynamic meteorology and oceanography. 2020, 72 (1), 1838181en_US

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Navngivelse-Ikkekommersiell 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse-Ikkekommersiell 4.0 Internasjonal