Joint analysis of wind wave characteristics derived from Voluntary Observing Ships data (VOS) and the third-generation spectral wave model WAVEWATCH III v.5.16 hindcast is presented. Global distributions of significant wave heights and mean periods in both datasets demonstrate good qualitative and quantitative agreement, especially in regions with a high spatiotemporal density of observations. Simulation results and visually observed wind sea and swell show perfectly consistent patterns of directional steadiness. However, wind sea heights in WW3 are overestimated predominantly in stormy regions, while swell heights are globally underestimated. The reasons for these discrepancies in assessment of wave system components are investigated in the framework of various wave regime analyses.
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The authors are deeply thankful to A.V. Gavrikov and S.I. Badulin for their educated advice and extensive feedback for the whole process of creating this paper.
The authors are grateful to the European Centre for Medium-Range Weather Forecasts (ECMWF) for providing open access to the ERA-5 reanalysis data. (https:// cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels?tab=overview).
The study was supported by a grant from the Ministry of Science and Higher Education of the Russian Federation (agreement no 14.613.21.0083, unique project identifier RFMEFI61317X0083).
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Grigorieva, V.G., Gulev, S.K. & Sharmar, V.D. Validating Ocean Wind Wave Global Hindcast with Visual Observations from VOS. Oceanology 60, 9–19 (2020). https://doi.org/10.1134/S0001437020010130
- wind waves
- visual wave observations
- spectral wave model WAVEWATCH III
- global wave characteristics