Work

Extremes of the Indian summer monsoon rainfall, ENSO and equatorial Indian Ocean oscillation

Year: 2004

Type: article

Abstract: It is well known that anomalies of the Indian Summer Monsoon Rainfall (ISMR) are linked to El Niño and Southern Oscillation (ENSO). We show that large anomalies of the ISMR are also linked to the Equatorial Indian Ocean Oscillation (EQUINOO) between states with enhancement/suppression of atmospheric convection over the western part of the equatorial Indian Ocean with suppression/enhancement over the eastern part and associated changes in the anomaly of the zonal wind along the equator. EQUINOO is the atmospheric component of the coupled Indian Ocean Dipole mode. There is a strong relation between the large anomalies of ISMR and a composite index which is a linear combination of the indices for ENSO and EQUINOO with all seasons with large deficits (excess) characterized by small (large) values of the index. However, the variation of ISMR within one standard deviation is more complex and does not appear to be related to the composite index.

Source: Geophysical Research Letters

DOI: 10.1029/2004gl019733

Authors: Sulochana Gadgil, P. N. Vinayachandran, P. A. Francis, Siddhartha Gadgil

Institutions: Indian Statistical Institute, Bangalore Centre, Indian Institute of Science Bangalore

Language: English

Topic: Climate variability and models

Subfield: Global and Planetary Change

Field: Environmental Science

Domain: Physical Sciences

SDG: Climate action

Open Access status: bronze

OpenAlex ID: W2131346755

FWCI: 8.841

Cites: 18

Cited by: 515

Related to: 8