Fig 9. Trend of changes in annual precipitation (a) and runoff (b) on scales of major periods.

For Fig 9(a), blue, red and yellow lines respectively represent the main periods 3a, 9a and 23a. And for Fig 9(b), blue and red lines respectively represent the main periods 3a and 14a. The main periods were got from the verification result of wavelet variance of Fig 8.