Fig. 4: ΔTT of extreme and ENSO years.
From: Present and future of the South Asian summer monsoon’s rainy season over Northeast India

a The temporal evolution of ΔTT for two extreme years with the longest (1964, blue) and shortest (1987, red) season shows the expansion and contraction of LRS, respectively, over NEI. b The composite of the annual cycle of ΔTT for El Niño (red) and La Niña (blue) years during 1901–2015 are shown over NEI, where the ‘gray’ curve is a long-term daily mean ΔTT. The seasonal (i.e., days between ‘Onset’ and ‘Withdrawal’ day for a year, as defined from ΔTT) spatial structure of TT anomaly over the South Asian monsoon domain for c El Niño and, d La Niña years.