Climate Dynamics

, Volume 53, Issue 11, pp 6543–6558 | Cite as

Assessment of coupled regional climate model (RegCM4.6–CLM4.5) for Indian summer monsoon

  • P. Maharana
  • Dhirendra Kumar
  • A. P. DimriEmail author


A model experiment with a regional climate model (RegCM4.6) coupled with an updated land–surface scheme (Community Land Model; CLM4.5) is integrated for 34 years to study the Indian summer monsoon (ISM). An eastward shift (towards Bay of Bengal; BoB) in simulated monsoon features due to the secular shift of the moist convective systems is observed. Further diagnostics show lower temperature over India as compared to BoB; while the Findlater jet is significantly weakened over the Arabian Sea. The low-pressure drags the southwesterly towards BoB through India. The Bowen ratio and evaporation reflect less soil moisture availability over the land. The analysis of simulated omega, moist static energy and Hadley circulation illustrates that an atmospheric condition dominates over land which further suppresses the convection and hence the rainfall. However, favorable atmospheric condition supporting convection and moisture availability leads to heavy precipitation over BoB and hence causes the eastward shift in simulated ISM rainfall. The convective fraction contributes the major share to the total precipitation. An evaluation of appropriate land surface spin-up period in order to investigate the optimum stabilization period for CLM4.5, indicates a possible weak coupling between land and atmosphere components in model simulation. This led to the improper energy and moisture exchanges between land and atmosphere in the simulation. The present work also suggests that, the simulated mean rainfall is not predominantly influenced by the length of different spin-up periods (up to 25 years) in case of weak coupling of land and atmosphere.


RegCM4.6 ISM CLM4.5 Convection Rainfall MSE 



The authors thank International Centre for Theoretical Physics (ICTP) for freely providing the RegCM4 code. DK thanks UGC for providing the timely financial assistance (UGC-JRF). PM thanks Climate Research and Simulation Laboratory (CRSL), SES, JNU for providing the necessary infrastructure for model simulation. The financial support from NMHS and NMSHE program of MoEF&CC and DST, Govt. of India, is acknowledged. PM also acknowledges the Council of Scientific and Industrial Research (CSIR), India for providing timely stipend (CSIR sanction letter no. – 09/263(1104)/2019/EMR-I). The authors thank the Max Planck Institute for Biogeochemistry for providing the gridded surface flux data for the analysis. The authors also thank the anonymous revierwers for providing insightful comments for improving the manuscript.

Supplementary material

382_2019_4947_MOESM1_ESM.docx (4.2 mb)
Supplementary material 1 (DOCX 4299 kb)


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Authors and Affiliations

  1. 1.Delhi College of Arts and CommerceUniversity of DelhiNew DelhiIndia
  2. 2.School of Environmental SciencesJawaharlal Nehru UniversityNew DelhiIndia

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