Advances in Meteorology / 2019 / Article / Tab 4

Research Article

A Comprehensive Analysis of the Changes in Precipitation Patterns over Beijing during 1960–2012

Table 4

Results of change point analysis for different series based on the Pettitt test.

Entire series (mm)Change pointPrechange mean (mm)Postchange mean (mm)Ratio of changes1

Jan2.220010.4872.31.8−0.23
Feb4.619860.1665.33.9−0.30
Mar9.019910.6129.48.4−0.11
Apr20.519970.3271924.40.26
May33.619760.04222.938.60.47
Jun77.219750.29562.283.70.28
Jul180.719980.060195.7139.2−0.31
Aug142.219960.024161.896.7−0.46
Sep50.619850.54044.756.30.23
Oct22.219950.4242026.90.31
Nov7.819671.1213.28.60.69
Dec2.219730.1240.82.70.86
Spring63.119760.14749.869.40.31
Summer400.119960.043430.4330.1−0.25
Autumn80.719880.6907389.90.21
Winter8.919961.3808.59.80.15
Annual553.019960.398573.5505.6−0.12

Note. 1The ratio of change is equal to the differences of mean precipitation between prior series and posterior series dividing the mean precipitation at the entire series. Significant abrupt change at a level of α = 0.10; significant abrupt change at level of α = 0.05.

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