We neglected the YDs with wind vectors not exhibiting any dominant direction. The wind data for selected YDs were clustered by the above azimuths Ku-0059436 price φ1 – 8, and respective subsets of radiance data, similar to the wind clusters in the YDs involved, were composed for subsequent analysis. Selection of YDs by wind features resulted in severe

shrinking of data. The data volume was additionally reduced when passing from wind clusters to the radiance ones, since the wind data were much more regular than the sea surface images in the visible. The geographical coordinates of the pixels of the images were converted into linear ones

relative to 51°30′E, 36°30′N (Figure 2). The pixel radiances of every cluster were averaged over the period from 1999 to 2004 in 4 × 4 km bins after the removal of outliers based on the three sigma rule. In the case of well-populated clusters, a high statistical significance was typical of the averaged binned radiances Lwnav(λ) because they were calculated from samples of 200–300 members. The averaging p53 inhibitor resulted in geographically identical tables of Lwnav for λ = 412, 443, 490, 510, 555 and 670 nm for each of the eight clusters. These tables were used for visualizing the spatial behaviour of the spectral radiances. The information obtainable from a comparison of radiance distributions of winds from different directions depends on the cluster population. In our case, the number of members Ni of the i-th cluster at wind azimuths φ1…8 varied as 4, 2, 33, 13, 11, 14, 34 and 5. The most and equally populated clusters (N3 = 33, φ3 = 90°) and (N7 = 34, φ7 = 270°) correspond to events associated with the onshore and offshore winds ( Figure 2b). Onshore and offshore winds. Figure 3 displays the spatial behaviour of radiances

in the blue, green and red (λ = 443, 555, and 670 nm). For Montelukast Sodium better comparability, we expressed the mean radiance Lwnb of a bin at a given wavelength as a fraction of radiance range, common to the offshore and onshore conditions: equation(2) Lwnb%=100Lwnav−LwnavminLwnavmax−Lwnavmin, where Lmaxwnav and Lminwnav are the maximum and minimum radiances of clusters φ3 = 90° and φ7 = 270. The radiance of the shallow in Figure 3 substantially exceeds that of the South Caspian basin at any wavelength regardless of winds, but radiance distributions within the shallow’s limits exhibit explicit dependences on wind direction and spectral range. The maximum Lwnb is located east of the 5 m depth contour.