Abstract
Seasonal simulations of the Indian summer monsoon using a 50-km regional climate model (RCM) are described. Results from three versions of the RCM distinguished by different domain sizes are compared against those of the driving global general circulation model (AGCM). Precipitation over land is 20% larger in the RCMs due to stronger vertical motions arising from finer horizontal resolution. The resulting increase in condensational heating helps to intensify the monsoon trough relative to the AGCM. The RCM precipitation distributions show a strong orographically forced mesoscale component (similar in each version). This component is not present in the AGCM. The RCMs produce two qualitatively realistic intraseasonal oscillations (ISOs) associated respectively with monsoon depressions which propagate northwestward from the Bay of Bengal and repeated northward migrations of the regional tropical convergence zone. The RCM simulations are relatively insensitive to domain size in several respects: (1) the mean bias relative to the AGCM is similar for all three domains; (2) the variability simulated by the RCM is strongly correlated with that of the driving AGCM on both daily and seasonal time scales, even for the largest domain; (3) the mesoscale features and ISOs are not damped by the relative proximity of the lateral boundaries in the version with the smallest domain. Results (1) and (2) contrast strongly with a previous study for Europe carried out with the same model, probably due to inherent differences between mid-latitude and tropical dynamics.
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References
Charney JG, Shukla J (1981) Predictability of monsoons. In: Lighthill J, Pearce RP (eds) Monsoon dynamics. Cambridge University Press, Cambridge, UK 99–109
Chen T-C, van Loon H (1987) Interannual variation of the tropical easterly jet. Mon Weather Rev 115:1739–1759
Chen T-C, Yen M-C (1994) Interannual variation of the Indian monsoon simulated by the NCAR community climate model: effect of the tropical Pacific SST. J Clim 7:1403–1415
Cullen MJP (1993) The unified forecast/climate model. Meteorol Mag 122:81–94
Dolman AJ, Gregory D (1992) The parameterization of rainfall interception in GCMs. Q J R Meteorol Soc 118:455–467
Giorgi F, Mearns LO (1991) Approaches to the simulation of regional climate change: a review. Rev Geophys 29,2:191–216
Giorgi F, Marinucci MR, Bates GT (1993) Development of a second-generation regional climate model (RegCM2). Part II: convective processes and assimilation of lateral boundary conditions. Mon Weather Rev 121:2814–2832
Giorgi F, Shields Brodeur C, Bates GT (1994) Regional climate change scenarios over the United States produced with a nested regional climate model. J Clim 7:375–399
Goswami BN (1994) Dynamical predictability of seasonal monsoon rainfall: problems and prospects. Proc Indian Natl Sci Acad 60A,1:101–120
Goswami BN, Shukla J (1984) Quasi-periodic oscillations in a symmetric general circulation model. J Atmos Sci 41:20–37
Gregory D, Allen S (1991) The effect of convective scale downdraughts upon NWP and climate simulations. Ninth Conf Numerical Weather Prediction, Denver, Colorado, Am Meteorol Soc pp 122–123
Gregory D, Rowntree PR (1990) A mass flux convection scheme with representation of cloud ensemble characteristics and stability dependent closure. Mon Weather Rev 118:1483–1506
Harzallah A, Sadourny R (1995) Internal versus SST-forced atmospheric variability as simulated by an atmospheric general circulation model. J Clim 8:474–495
Hulme M, Conway D, Jones PD, Jiang T, Barrow EM, Turney C (1995) Construction of a 1961–90 European climatology for climate change impacts and modelling applications. Int J Climatol 15:1333–1363
Jones RG, Murphy JM, Noguer M (1995) Simulation of climate change over Europe using a nested regional climate model. Part I: assessment of control climate, including sensitivity to location of lateral boundaries. Q J R Meteorol Soc 121:1413–1449
Ju J, Slingo J (1995) The Asian summer monsoon and ENSO. Q J R Meteorol Soc 121:1133–1168
Krishnamurti TN, Bhalme HN (1976) Oscillations of a monsoon system, Part I: observational aspects. J Atmos Sci 33:1937–1954
Krishnamurti TN, Surgi N (1987) Observational aspects of summer monsoon. In: Chang C-P, Krishnamurti TN (eds) Monsoon meteorology. Oxford University Press, Oxford, UK, pp 3–25
Legates DR, Willmott CJ (1990) Mean seasonal and spatial variability in gauge-corrected global precipitation. Int J Climatol 10:111–127
Palmer TN, Brankovic C, Viterbo P, Miller MJ (1992) Modelling interannual variations of summer monsoons. J Clim 5:399–417
Parker DE, Folland CK, Ward MN, Bevan A, Jackson M, Maskell K (1995) Marine surface data for analysis of climatic fluctuations on interannual to century time scales. Natural climate variability on decade-to-century time scales. Martison DG, Bryan K, Ghil M, Hall MM, Karl TR, Sarachik ES, Soorooshian S, Talley LD (eds) National Research Council (in press)
Parthasarathy B, Rupa Kumar K, Kothawale DR (1992) Indian summer monsoon rainfall indices: 1871–1990. Meteorol Mag 121:174–185
Rasmusson EM, Carpenter TH (1983) The relationship between eastern equatorial Pacific sea surface temperatures and rainfall over India and Sri Lanka. Mon Weather Rev 111:517–528
Rowell DP, Folland CK, Maskell K, Ward MN (1995) Variability of summer rainfall over tropical north Africa (1906–92): observations and modelling. Q J R Meteorol Soc 121:669–704
Senior CA, Mitchell JFB (1993) CO2 and climate: the impact of cloud parameterization. J Clint 6:393–418
Sikka DR, Gadgil S (1980) On the maximum cloud zone and the ITCZ over Indian longitudes during the southwest monsoon. Mon Weather Rev 108:1840–1853
Simmons AJ, Burridge DM (1981) An energy and angular-momentum conserving finite-difference scheme and hybrid coordinates. Mon Weather Rev 109:758–766
Smith RNB (1990) A scheme for predicting layer clouds and their water content in a general circulation model. Q J R Meteorol Soc 116:435–460
Snedecor GW, Cochran WG (1967) Statistical methods. Ames, Iowa State University, Iowa 593 pp
Vukicevic T, Errico RM (1990) The influence of artificial and physical factors upon predictability estimates using a complex limited-area model. Mon Weather Rev 118:1460–1482
Warrilow DA, Sangster AB, Slingo A (1986) Modelling of land surface processes and their influence on European climate. Met O 20 DCTN 38, Bracknell, UK. (Unpublished, copy available from the National Meteorological Library)
Webster PJ, Yang S (1992) Monsoon and ENSO: selectively interactive systems. Q J R Meteorol Soc 118:877–926
Wilson MF, Hendersen-Sellers A (1985) A global archive of land cover and soils data for use in general circulation models. J Climatol 5:119–143
World Climate Research Programme (WCRP) (1992) Simulation of interannual and intraseasonal monsoon variability. Rep Workshop, National Center for Atmospheric Research; Boulder, Colorado, USA, 21–24 October 1991. WMO/TDNo. 470, WMO, Geneva
Yasunari T (1980) A quasi-stationary appearance of 30 to 40 day period in the cloudiness fluctuations during the summer monsoon over India. J Meteorol Soc Jap 58:225–229
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Bhaskaran, B., Jones, R.G., Murphy, J.M. et al. Simulations of the Indian summer monsoon using a nested regional climate model: domain size experiments. Climate Dynamics 12, 573–587 (1996). https://doi.org/10.1007/BF00216267
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DOI: https://doi.org/10.1007/BF00216267