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Role of cloud microphysics in improved simulation of the Asian monsoon quasi-biweekly mode (QBM)

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Abstract

A major sub-seasonal variability of the tropics and sub-tropics, the quasi-biweekly mode (QBM), is known to have significant influence on the seasonal mean of the south Asian monsoon rainfall. A coupled Atmosphere–Ocean General Circulation Model (AOGCM) being essential for seasonal prediction, the ability of the AOGCMs in simulating the space–time characteristics with fidelity is critical for successful seasonal prediction of the south Asian monsoon in particular and seasonal prediction in the tropics in general. However, strength and weaknesses in simulating the QBM by AOGCMs have remained poorly investigated so far. Here, we examine the simulation of the QBM in AOGCM and show that improvement of parameterizations of both convection and microphysics is required to improve the simulation of the QBM. While the standard version of the model overestimates the variance of QBM and simulates a smaller scale Rossby waves (n = 1), the modified version of the model where the simple Arakawa–Schubert (SAS) convection parameterization is combined with a new improved microphysics parameterization (MCMv.1) proposed by us, simulates a more realistic space–time characteristics of the QBM. In yet another version of the model, we combine the new SAS with the new improved microphysics parameterization. Interestingly, this version of the model also simulates the space–time structure poorly with poor westward propagation and fragmented organization, but it simulates a reasonable variance. These results indicate that a synergy among the convective parameterization and microphysics parameterizations is critical in simulating the QBM in particular and equatorial waves in general. We show that most the biases in simulating the QBM may be related to the biases of the model in simulating the stratiform fraction of precipitation. While the simulation of the space–time characteristics of QBM is better simulated in the MCMv.1, the convective coupling is still too strong as compared to observations, an area for future improvement of the model.

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Acknowledgements

Indian Institute of Tropical Meteorology (IITM), Pune, is fully funded by the Ministry of Earth Sciences (MoES), Government of India, New Delhi. We thank MoES and Director IITM, HPCS for all the support to carry out this work. We also thank NCEP for providing initial conditions and modeling support. BNG is grateful to the Science and Engineering Research Board (SERB), Govt. India for a Fellowship. The model simulation is also archived at ‘Aaditya’ HPC system at IITM and available on request from the corresponding author. The authors have no conflicts of interest to declare. Authors are grateful to reviewers for their insightful comments, which help to improve the manuscript.

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Hazra, A., Chaudhari, H.S., Saha, S.K. et al. Role of cloud microphysics in improved simulation of the Asian monsoon quasi-biweekly mode (QBM). Clim Dyn 54, 599–614 (2020). https://doi.org/10.1007/s00382-019-05015-5

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Keywords

  • Indian summer monsoon
  • Quasi-biweekly mode (QBM)
  • CFSv2
  • Modified convective microphysics