The progressive wind vector for the above dates, obtained from the Gascony station data, is shown in Fig. 2.
There is a similarity between the buoy drift (Fig. 1) and the progressive wind vector, even when the buoy position was located significantly far away from the Gascony station. This drifting pattern is characteristic of winters, in the Bay of Biscay, where the depressions with southwesterly winds occur frequently near the coast of Galicia.
These are combined with northwesterly storms, caused by low pressure systems located to the west of the British Isles. The influence of the former extends up to the eastern part of the Bay of Biscay, whilst the latter reaches the Cantabrian coast.
Following this comparison, wind appears to be a basic mechanism affecting oil dispersion processes.
Further, the Gascony wind data have been used to investigate the accuracy of the six-hourly NCEP wind reanalysis data for this time period; these were used as surface forcing input, by the ROMS model, to predict the circulation patterns.
The spatial coverage of these data is 88.542°N–88.542°S, 0°E–358.125°E, on a T62 Gaussian grid with 192x94 points. The air–sea heat and momentum fluxes in the model were calculated using the bulk formulae of Fairall et al. (1996, 2003), utilising the model sea surface temperature and the sea level air temperature, pressure, relative humidity, and 10 m winds of the NCEP atmospheric forcing.
The progressive wind vector for the above dates, obtained from the Gascony station data, is shown in Fig. 2.
There is a similarity between the buoy drift (Fig. 1) and the progressive wind vector, even when the buoy position was located significantly far away from the Gascony station. This drifting pattern is characteristic of winters, in the Bay of Biscay, where the depressions with southwesterly winds occur frequently near the coast of Galicia.
These are combined with northwesterly storms, caused by low pressure systems located to the west of the British Isles. The influence of the former extends up to the eastern part of the Bay of Biscay, whilst the latter reaches the Cantabrian coast.
Following this comparison, wind appears to be a basic mechanism affecting oil dispersion processes.
Further, the Gascony wind data have been used to investigate the accuracy of the six-hourly NCEP wind reanalysis data for this time period; these were used as surface forcing input, by the ROMS model, to predict the circulation patterns.
The spatial coverage of these data is 88.542°N–88.542°S, 0°E–358.125°E, on a T62 Gaussian grid with 192x94 points. The air–sea heat and momentum fluxes in the model were calculated using the bulk formulae of Fairall et al. (1996, 2003), utilising the model sea surface temperature and the sea level air temperature, pressure, relative humidity, and 10 m winds of the NCEP atmospheric forcing.
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