Mutation Characteristics of Precipitation Concentration Spatiotemporal Variation and Its Potential Correlation with Low-Frequency Climate Factors in the LRB Area from 1960 to 2020

The precipitation conce ntration degree (PCD) and concentration period (PCP) in the Liaohe River basin (LRB) from 1960 to 2020 were calculated depending on daily data derived meteorological stations. mutations of PCD PCP identified by sliding t-test, spatiotemporal evolution characteristics before after mutation point further analyzed. Cross wavelet transform (CWT) was used reveal influence four low-frequency climate factors (Pacific Decadal Oscillation (PDO), Arctic (AO), El Niño -Southern (ENSO), Sunspots (SS)) concentration. results presented as follows: Mutations occurred sequence 1980 2005 LRB. Spatial distribution generally increased southeast northwest tended flatten. Over past 60 years, annual decrease, with a variation range 0.53 0.80. relatively concentrated early July August, decreasing increasing mutation. Important climatic driving included PDO, SS, AO. However, resonance between characterized complexity diversity. mainly affected AO SS ENSO had an important both PCP, but no significant correlation occurrence.