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- W4286586318 abstract "Abstract The Indian summer monsoon rainfall (ISMR) exhibits significant variability, affecting the food and water security of the densely populated Indian subcontinent. The two dominant spatial modes of ISMR variability are associated with the El Niño Southern Oscillation (ENSO) and the strength of the semi-permanent monsoon trough and related variability in monsoon depressions, respectively. ENSO strongly influences the ISMR, but the temporal and regional variability of this teleconnection is not well understood. Our analysis shows that the teleconnection between ENSO and ISMR increased consistently between 1901 to 1940, from a moderate to substantially strong correlation, remained stable at a strong correlation during 1941 to 1980, and then decreased consistently again to a moderate correlation in the recent period, 1981 to 2020. We have also explored the regional variability based on the consistency in the ENSO–ISMR relationship. We identify three regions—namely north, central and south India, where the variability in ENSO–ISMR relationship is moderate, high and consistent —and investigate the mechanisms behind the varying teleconnections. The overall decrease in ISMR is related to warm SST anomalies in the eastern Pacific Ocean suggesting El Niño conditions. Meanwhile, the decrease of rainfall over the Indo-Gangetic Plains and an increase over the southern peninsula is associated with warm SST anomalies over the Indian Ocean. We find that the temporal changes in ENSO–ISMR relation in different regions of the country are due to the overlying influence of the monsoon trough and related variability in monsoon depressions." @default.
- W4286586318 created "2022-07-22" @default.
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- W4286586318 date "2022-07-22" @default.
- W4286586318 modified "2023-09-27" @default.
- W4286586318 title "Regional and Temporal Variability of Indian Summer Monsoon Rainfall in relation to El Niño Southern Oscillation" @default.
- W4286586318 doi "https://doi.org/10.21203/rs.3.rs-1825980/v1" @default.
- W4286586318 hasPublicationYear "2022" @default.
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