Near-surface mean and gust wind speeds in ERA5 across Sweden: towards an improved gust parametrization
The ERA5 reanalysis product has been compared with hourly near-surface wind speed and gust observations across Sweden for 2013–2017. ERA5 shows closer agreement than the previous ERA-Interim reanalysis with regard to both mean wind speed and gust measurements, although signifcant discrepancies are still found for inland and mountainous regions. Therefore, attempts have been made to improve formulations of the gust parametrization used in ERA5 by adding an elevationdependency and by adjusting the convective gust contribution. Major improvements, especially over mountain regions, are achieved when the elevation diferences among the stations are considered. Closer agreement between the observed and parametrized gusts is reached when the convective gust contribution is also tuned. The newly designed gust parametrization was also tested for Norway, which is characterized by more complex topography. Wind gusts from the selected Norwegian stations are more realistically simulated when both the elevation-dependency and the tuned convective contribution are implemented, although the parametrized gusts are still negatively biased. Such biases are not explained by the diferent in gust duration in recorded wind gusts between Sweden and Norway
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Springer
2020-05-29
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| Subjects: | Wind speed, Wind gusts, Parametrization, ERA5, |
| Online Access: | http://hdl.handle.net/10261/222719 |
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