Advances in Meteorology

Research Article

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

Table 3

The annual trends in the freeze first date, last date, and duration (day decade−1) at the 14 meteorological stations of the TRSR (Figure 1) for the three different time periods. Significance levels: ; .
 XinghaiTongdeZekuZaduo YushuGuoluo DariHenanRuoergaiNangqianChangduZhiduoQumalaiMaduoAverage
Freeze first date
 1960–20145.167.591.054.732.190.364.952.033.090.412.18nonenonenone3.20
 1985–20142.0813.053.682.404.931.474.255.3716.835.102.297.4515.39−5.915.65
 2000–20146.3910.682.685.2916.86−0.79−0.467.7552.716.93−5.6813.6410.04−1.549.11
Freeze last date
 1960–2014−2.42−8.64−9.43−6.51−0.52−3.50−4.72−1.29−5.26−5.22−3.31nonenonenone−3.55
 1985–20141.82−11.44−10.56−9.59−5.12−8.95−4.74−8.55−12.97−15.10−4.62−4.09−7.86−24.03−9.42
 2000–20140.79−15.82−18.89−5.61−10.79−0.32−4.43−4.43−40.43−19.36−1.82−8.64−1.61−17.14−10.64
Freeze duration
 1960–2014−7.17−16.21−10.37−11.82−2.65−3.65 − 9.79 − 3.89−8.93−9.42−6.02nonenonenone−7.52
 1985–20140.91−26.72−13.49−13.00−10.69−10.63−7.10−13.59−30.38−22.02−8.08−9.07−23.59−17.32−14.74
 2000–2014−2.31−25.58−15.69−16.53−28.026.732.66−10.97−98.09−22.4011.39−18.40−5.74−9.87−16.90