Long‐term changes in spatially coherent extreme precipitation systems over Central India. (22nd June 2022)

• Record Type: Journal Article
• Authors: Gupta, Anu; Takahashi, Hiroshi G.
• Is Part Of: Atmospheric science letters. Volume 23:Number 11(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-22
• Subjects: climate variability -- extreme rainfall -- precipitation systems -- south Asian monsoon -- spatial scale of rainfall; Atmospheric physics -- Periodicals; 551
• DOI: 10.1002/asl.1118
• Languages: English
• ISSNs: 1530-261X

Abstract

Abstract: The present study examined extreme rainfall events (EREs) in central India during the summer monsoon season, focusing on their spatial characteristics. A station‐based gridded and a station‐satellite‐blended dataset was used to examine long‐term and recent variations in precipitation characteristics for 50 years (1951–2000) and 38 years (1981–2018), respectively. A precipitation system approach (PSA) was applied to identify the ERE precipitation systems and categorized spatial sizes of ERE systems into three categories: sporadic, intermediate, and massive ERE precipitation systems. Conventionally, the ERE frequency is equal to the total number of ERE grids, whereas PSA counts ERE systems. The sporadic precipitation grid contributes 42% of all the ERE grids, and sporadic EREs frequency increases in the long‐term. The long‐term trend of intermediate and massive EREs does not increase and quite sharply increases, respectively, and these EREs are also intensifying. Recent 38 years have shown a reverse in the trends of ERE characteristics, the frequency and intensity of intermediate and massive EREs have decreased, whereas the massive ERE systems are broadening. Abstract : In general, different sizes of precipitation systems associated with phenomena such as thunderstorms, meso‐scale systems or synoptic systems occur in the environment. A large difference in the long‐term analysis of extreme rainfall events over central India can be seen between the grid based conventional approach and the precipitation system approach. Precipitation system approach gives more physical meaning of the extreme rainfall events long‐term changes.