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AbstractBoth wind speeds and wind directions are important for predicting wave heights near complex coastal areas such as small islands, because the fetch is sensitive to the wind direction. High-frequency (HF) radar can be used to estimate sea-surface wind directions from the first-order scattering. We propose a simple method to correct sea-surface wind vectors from reanalysis data using the wind directions estimated from HF radar. The constraints for wind-speed corrections are that the corrections are small and the corrections of horizontal divergences are small. A simple algorithm for solving the solution that minimizes the weighted sum of the constraints is developed. We also propose another simple method to correct sea-surface wind vectors. The constraints of the method are that corrections of wind vectors and horizontal divergences from the reanalysis wind vectors are small and that the projection of the corrected wind vectors to the direction orthogonal to the HF radar estimated wind direction is small. The impact of wind correction on wave parameter prediction is large in the area in which the fetch is sensitive to wind direction. The accuracy of the wave prediction is improved by correcting the wind in that area. Correction of wind direction is more important than correction of wind speeds for the improvement. This method could be used for near-real-time wave monitoring by correcting forecast winds using HF-radar data.
Journal of Atmospheric and Oceanic Technology – American Meteorological Society
Published: Jun 27, 2017
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