Relevance Of Era5 Reanalysis For Wind Energy Applications: Comparison With Sodar Observationsстатья
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Аннотация:ERA5 reanalysis is one of the most trusted climate data sources for wind energy modeling. However, any reanalysis
should be verified through comparison with observational data to detect biases before further use. For wind verification at
heights close to typical wind turbine hub heights (i.e. about 100 m), it is preferable to use either in-situ measurements
from meteorological towers or remote sensing data like acoustic and laser vertical profilers, which remain independent of
reanalysis. In this study, we validated the wind speed data from ERA5 at a height of 100 m using data from four sodars (acoustic
profilers) located in different climatic and natural vegetation zones across European Russia. The assessments revealed a
systematic error at most stations; in general, ERA5 tends to overestimate wind speed over forests and underestimate it over
grasslands and deserts. As anticipated, the largest errors were observed at a station on the mountain coast, where the relative
wind speed error reached 45%. We performed the bias correction which reduced absolute errors and eliminated the error
dependence on the daily course, which was crucial for wind energy modeling. Without bias correction, the error in the wind
power capacity factor ranged from 30 to 50%. Hence, it is strongly recommended to apply correction of ERA5 for energy
calculations, at least in the areas under consideration.