294 Figure 1 – Histograms of daily mean transport directions during the warm season (February–May) from 2020 to 2024 Figure 2 shows the distribution of transport directions during the cold season, which is highly concentrated compared to the warm season. The histogram exhibits a clear peak centered at 344° (Dir(to)), corresponding to the persistent southeasterly trade winds. The central 90% of the daily mean wind directions falls within a narrow range from 327.3° to 360.4°, equivalent to −16.7° to +16.4° relative to the mean direction, with a bin width of 1°. This strong directional persistence indicates that atmospheric transport during the cold season is highly stable, providing a physically consistent basis for defining particle deposition zones in coastal areas. Accordingly, the oceanic dispersion simulations presented in the following sections were conducted primarily under the wind conditions characteristic of the cold season. Figure 2 – Histograms of daily mean transport directions during the cold season (July– October) from 2020 to 2024 3.2 Wind speed characteristics under dominant cold-season transport directions Figure 3 shows the distribution of 10 m wind speeds during the cold season, computed for operating hours and restricted to the central 90% direction range (327.3°–360.4°) identified in Section 3.1. Wind speeds peak between 5 and 7 m s⁻¹, with most values in the range 4.5–7.5
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