Evaluating modelled winds over an urban area using ground‐based Doppler lidar observations

Autor: Maria Filioglou, Jana Preissler, Anselme Troiville, Ludovic Thobois, Ville Vakkari, Mikko Auvinen, Carl Fortelius, Erik Gregow, Karoliina Hämäläinen, Antti Hellsten, Leena Järvi, Ewan O'Connor, David Schönach, Anne Hirsikko
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Meteorological Applications, Vol 29, Iss 2, Pp n/a-n/a (2022)
Druh dokumentu: article
ISSN: 1469-8080
1350-4827
DOI: 10.1002/met.2052
Popis: Abstract Wind information in urban areas is essential for many applications related to air pollution, urban climate and planning, safety of drone‐related operations, and assessment of urban wind energy potential. These applications require accurate wind forecasts, and obtaining this information in an urban environment is challenging as the morphology of a city varies from street to street, altering the wind flow. Remote sensing techniques such as Doppler lidars (light detection and ranging) provide a unique opportunity for wind forecast verification as they can provide both the vertical profile of the horizontal wind and the spatial variation in the horizontal domain at high resolution. In this study, the performance of numerical weather prediction (NWP) models, analysis systems, and large‐eddy simulation (LES) models have been analysed by comparing the modelled winds against Doppler lidar observations under various atmospheric conditions and from season to season, in the coastal environment of Helsinki, Finland. The long‐term mean vertical profile of the modelled horizontal wind shows good agreement with observations; the NWP model and the analysis systems selected here exhibit different strengths and weaknesses depending on the atmospheric conditions but no significant diurnal variation in performance. However, both the model and analysis systems show differences in their spatially‐averaged bias when investigating different wind directions. LES verification shows that these models can potentially provide winds down to street level, given pre‐computed scenarios of atmospheric conditions. For Helsinki, the observed winds are stronger during winter than summer, and, on average, higher wind speeds were observed at the urban site than the sub‐urban site.
Databáze: Directory of Open Access Journals
Externí odkaz: