Characteristics of Regional Hourly Extreme Precipitation With Different Durations Over the Northeast Plain, China During Summer

Abstract

Regional extreme precipitation events (REPEs) are the focus of current research with a large coverage long-term duration. The characteristics of REPE in the summer remain unclear over the Northeast Plain of China (NPC), one of the only four major black soil distribution areas in the world. This study investigates the spatial, diurnal, sub-seasonal and long-term trend characteristics of REPE over NPC in the summer of 2000–2020 based on the Multi-satellite Retrievals precipitation data GPM-IMERG. The results show that the amount and intensity of total REPE increase from north to south of NPC in the summer of 2000–2020 and the frequency of total REPE mainly concentrates in the middle of NPC. The primary peak of the total REPE amount is at 18:00 (BJT) with a large centre cross the middle of NPC. The secondary peak is between 2:00 (BJT) and 5:00 (BJT) with the large centre located in the southern NPC. The REPE mainly happens in the summer months of July-August during 2000–2020 over NPC, and the large centre of amount and intensity locates in the southern NPC. The intensity of total REPE exhibits a significantly increase during the summer of 2000–2020. The amount, frequency, and intensity of REPE with a duration of more than 19 hr show the significant enhancement. The findings of this study provide the basic features of REPE over NPC in summer on an hourly scale.