Figure: Vertical cross-section of ozone anomaly (ppb) from the edges of anticyclone over NI and TP as seen from (a) ERA-Interim and, (b) ECHAM5-HAMMOZ. Black thick line indicates tropopause.
The stratospheric ozone rich cold intrusion during El‐Niño over the Indian region: implication during the Indian summer monsoon
We investigated ozone variability due to stratospheric intrusions in the upper troposphere over India and associated radiative impacts during monsoon breaks co‐occurring with El Niño using the ECHAM5‐HAMMOZ, Global‐Chemistry‐climate model simulations, and ERA‐Interim reanalysis data. During El Niño, deep stratospheric intrusions occur at the North India ‐ Tibetan Plateau region and the eastern edge of the monsoon anticyclone. The intrusions frequently penetrate deep into the troposphere which enhances the surface ozone levels by ~10–20 ppb and augments radiative forcing by ~0.33 W m−2 at the top of the atmosphere. (Roy et al., 2020, https://doi.org/10.1002/joc.6680)