Bentamy A., Quilfen Y., Gohin F., Grima N., Lenaour M., Servain Jacques. (1996). Determination and validation of average wind fields from ERS-1 scatterometer measurements. Global Atmosphere and Ocean System, 4, p. 1-29.
Titre du document
Determination and validation of average wind fields from ERS-1 scatterometer measurements
Année de publication
1996
Type de document
Article
Auteurs
Bentamy A., Quilfen Y., Gohin F., Grima N., Lenaour M., Servain Jacques
Source
Global Atmosphere and Ocean System, 1996,
4, p. 1-29
A geostatistic method, known as the kriging method is employed to produce a gridded wind field using ERS-1 scatterometer-retrieved wind vectors. The method, which differs from the classical interpolation methods, makes use of spatial and temporal empirical structure functions for wind speed, eastward wind component u and northward wind component v, and the Gauss-Markov theorem to objectively analyze this vector field and yields an expression for the variance error expected in this estimate. The stationarity assumptions needed to apply the kriging method are tested statistically. Resultant three-, seven- and ten-day average wind fields computed over the tropical region indicate that the method reproduces large and small-scale features. The accuracy of the gridded wind fields is determined by comparisons with three-day averages calculated from European Centre for Medium-range Weather Forecasts (ECMWF) wind vector analysis, with ten-day averages derived from ship measurements over the tropical Atlantic, and with seven-day averages computed from moored-buoy wind measurements, which were recorded by Pacific Marine Environmental Laboratory (PMEL) in the Pacific ocean. In all cases, there is good agreement between the data sets. The rms values of the difference between satellite and numerical analysis, ship and buoy-derived wind fields are 1.67 m/s, 1.17 m/s and 1.05 m/s, respectively. (Résumé d'auteur)
