  The ISMR profoundly impacts over a billion people across the region. ISMR
extremes have been linked to the ENSO and modulated by the Indian Ocean Dipole
(IOD). ISMR of 2022 displayed intriguing spatial patterns: above-normal
precipitation over the south peninsula and central India, normal over Northwest
India, and below-normal over East and NE India. In 2022, La Nina conditions
associated with a negative IOD (nIOD), were prevalent over the equatorial
Pacific Ocean (PO) and IO. This study investigates the often-overlooked Oceanic
subsurface contribution to large-scale atmospheric convection over the tropical
IO. By undertaking a comprehensive analysis, we find that strong equatorial
westerly wind anomalies prevailed over the equatorial IO during co-occurring
years generating eastward propagating downwelling Kelvin waves which deepens
the D20 in the eastern equatorial IO. The Kelvin waves then propagates into BoB
and gets reflected from southern tip of India as westward propagating Rossby
waves deepening the D20 and causing low level wind convergence in the Northern
Arabian Sea(NAS). We identify two centres of low-level wind convergence, one
over NAS and another over Maritime Continent during co-occurrence years. These
wind convergence centres play a pivotal role in channeling moisture towards
their core, also, significantly deepen D20, increase the Ocean heat content and
thus maintaining warmer SSTs over area of conversions. Together, these
interrelated factors create an environment that is conducive for enhanced
convective activity over the zone of convergence, enhancing and sustaining the
convective conditions. This study underscores the significant contribution of
ocean dynamics in shaping large-scale atmospheric convection during the
co-occurrence years, highlighting the significance of considering broader
Oceanic variables in comprehending and forecasting monsoonal variability.
