Climate evolution characteristics of Beijing-Tianjin-Hebei Region for the last 55 years

Based on the climatic data of 22 meteorological stations in Beijing-Tianjin-Hebei region from 1961 to 2015, by means of the climate tendency rate, Mann-Kendall mutation test, Morlet wavelet analysis, and inverse distance weighting (IDW) , we systematically studied the temporal-spatial variations of climatic variables over the Beijing-Tianjin-Hebei region in the recent 55 years. The results showed that: 1) In the past 55 years, the Beijing-Tianjin-Hebei region underwent an increase of temperature and a decrease of sunshine, precipitation, wind speed, and average relative humidity. 2) The climatic variables all went through a sudden change in 1979-1989, and the annual precipitation went through a second sudden change in 1996. 3) The climatic variables all showed a complex characteristic of coupling at multiple time scales, and their first main period scales ranged from 8 to 25 years. 4) In Beijing-Tianjin-Hebei region, the average air temperature showed a decreasing trend from south to north, with the change rate peaking in the central and western area. Both precipitation and its change rate showed a decreasing trend from east to west. Sunshine hours showed an increasing trend from south to north, while its change rate showed the opposite trend. Relative humidity showed a decreasing trend from southeast to northwest, while its change rate showed a decreasing trend from southwest to northeast. The peaks of wind speed and its change rate both appeared in Zhangbei and Tanggu area.

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