Increased sporadic extremes decrease the intraseasonal variability in the Indian summer monsoon rainfall.

ABSTRACT: The Indian summer monsoon (ISM) shows quasi-rhythmic intraseasonal oscillations (ISO) manifested as alternate 'active' phases of copious rainfall and quiescent phases of 'break'. Within these periodic phases, the daily rainfall shows large variability and exhibits spatiotemporally sporadic extreme rainfall events. The recent decades have witnessed a significant increase in the number of these extreme rainfall events, especially in the quiescent phases. This increase is accompanied by a decreasing trend in the mean monsoon rainfall and a weakening variance of its low-frequency ISO (LF-ISO) cycle. However, any physical link between this apparent paradox of increased extreme rainfall events and weakened slower-time-scale components is not yet reported. Here, using observations and numerical m

SUBMITTER: Karmakar N 

PROVIDER: S-EPMC5552763 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature