The influence of El Niño/La Niña on the upper‐tropospheric circulation pattern, especially on tropical easterly jet stream (TEJ) over the Asian summer monsoon region, has been studied using ECMWF Reanalysis (ERA) Interim Data for a period of 34 years (1980–2013). The TEJ shows distinctive features during El Niño and La Niña events. The intensity of the TEJ increases and it spreads horizontally and vertically during La Niña yea...

The tropical climate has undergone noticeable changes on interdecadal time scales. The climate shift that occurred in the late 1970s attained enormous attention owing to its global‐scale variations in ocean temperature, heat content and El Nino Southern Oscillation (ENSO) properties. Earlier studies presented the effect of this shift on ENSO and the Asian summer monsoon–ENSO relationship. The present study is an attempt to inv...

Tropospheric biennial oscillation (TBO) is the tendency for a relatively strong monsoon to be followed by a weaker one, and vice versa , for the Asian–Australian monsoon system. According to this definition, TBO years include most of the El nino‐Southern Oscillation (ENSO)‐onset years and some other years also. It is believed that the TBO years, with and without ENSO‐onset years, have differences only in the magnitude of the s...