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Towards a realistic MISO simulation: impact of rectification

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Abstract

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 improving the representation of 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 along with implementing a modern bulk surface-flux algorithm in a global coupled model improves the simulation of MISO characteristics. The present analysis showcases how rectification in the presence of a revised turbulent flux algorithm and diurnal skin temperature parameterisation 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 mechanisms of MISOs are pronounced in the presence of intra-seasonal rectification by diurnal SSTs and air–sea interactive flux feedbacks.

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The coupled model hindcast datasets generated during and/or analysed during the current study are not publicly available due to its large size but are available from the corresponding author on reasonable request.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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All authors contributed to the study conception and design. Coupled model experiments and analysis were carried out by Maheswar Pradhan. The first draft of the manuscript was written by MP and Dr. SAR and Prof. AB commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Suryachandra A. Rao.

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Pradhan, M., Rao, S.A. & Bhattacharya, A. Towards a realistic MISO simulation: impact of rectification. Clim Dyn (2024). https://doi.org/10.1007/s00382-023-07053-6

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  • DOI: https://doi.org/10.1007/s00382-023-07053-6

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