Towards a Realistic MISO Simulation: Impact of Rectification

State-of-the-art coupled models have several limitations in representing the phase and amplitude characteristics of monsoon intra-seasonal oscillations (MISO). Specifically, the models' deficiencies in predicting stronger active spells have been widely reported in earlier studies. In the present study, we endeavour to overcome this limitation by better representing the diurnal cycle of the sea surface temperature and the associated feedback processes. In the present study, we demonstrate that resolving the diurnal cycle rectification in a state-of-the-art global coupled model improves the simulation of MISO. The present analysis showcases how rectification can modulate the oceanic, atmospheric and interfacial properties so that the coupled model can better simulate stronger active monsoon spells. The essential requirements for the coherent northward propagation mechanism of MISOs are pronounced in the presence of intra-seasonal rectification by diurnal SSTs.