Figure 4

The clustering analysis results at SMN (ab) and at SMW (cd) for the daily SBL spectra, \({P}_{SBL}\), shown in Fig. 2d and e, respectively. (a,c) The smaller value of the SBLs in the night window and the next morning window is selected as the SBL of each day and is plotted with a circle of the color corresponding to its spectral cluster as in the legend, (b,d) The monthly fractions of days belonging to each cluster are shown by bars of the same color. The clusters of current interest are enclosed by the magenta rectangles in the legends. The gray clusters represent data with problems. (e) The daily precipitation data recorded near KVO station in Fig. 1a. The black triangles and circled numbers are the same as in Fig. 2.