Interdecadal Changes in the Freeze Depth and Period of Frozen Soil on the Three Rivers Source Region in China from 1960 to 2014

Figure 7

Time series of annual air temperature (a), thawing index (b), annual precipitation (c), and freeze depth (d) in TRSR (black line) with the time series of freeze last date (grey line). All variables were standardized with respect to their mean and standard deviation.

(a)

(b)

(c)

(d)