atmosphere Article Multiscale Spatio-Temporal Changes of Precipitation Extremes in Beijing-Tianjin-Hebei Region, China during 1958–2017 Xiaomeng Song 1,2,3,* , Xianju Zou 1, Chunhua Zhang 1, Jianyun Zhang 2 and Fanzhe Kong 1 1 School of Resources and Geosciences, China University of Mining & Technology, Xuzhou 221116, China 2 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China 3 State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China * Correspondence:
[email protected]; Tel.: +86-516-83591018 Received: 12 June 2019; Accepted: 10 August 2019; Published: 13 August 2019 Abstract: In this study, based on daily precipitation records during 1958–2017 from 28 meteorological stations in the Beijing-Tianjin-Hebei (BTH) region, the spatio-temporal variations in precipitation extremes defined by twelve indices are analyzed by the methods of linear regression, Mann-Kendall test and continuous wavelet transform. The results showed that the spatial patterns of all the indices except for consecutive dry days (CDD) and consecutive wet days (CWD) were similar to that of annual total precipitation with the high values in the east and the low value in the west. Regionally averaged precipitation extremes were characterized by decreasing trends, of which five indices (i.e., very heavy precipitation days (R50), very wet precipitation (R95p), extreme wet precipitation (R99p), max one-day precipitation (R 1day), and max five-day precipitation (R 5day)) exhibited significantly decreasing × × trends at 5% level. From monthly and seasonal scale, almost all of the highest values in R 1day × and R 5day occurred in summer, especially in July and August due to the impacts of East Asian × monsoon climate on inter-annual uneven distribution of precipitation.