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Simulations of Monsoon Intraseasonal Oscillation Using Climate Forecast System Version 2: Insight for Horizontal Resolution and Moist Processes Parameterization

1
Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Road, Pune 411008, India
2
Department of Atmospheric and Space Sciences, Savitribai Phule Pune University, Pune 411007, India
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(8), 429; https://doi.org/10.3390/atmos10080429
Received: 29 May 2019 / Revised: 8 July 2019 / Accepted: 9 July 2019 / Published: 26 July 2019
(This article belongs to the Special Issue Convection and Its Impact on Weather)
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Abstract

In the present study, we analyze the Climate Forecast System version 2 (CFSv2) model in three resolutions, T62, T126, and T382. We evaluated the performance of all three resolutions of CFSv2 in simulating the Monsoon Intraseasonal Oscillation (MISO) of the Indian summer monsoon (ISM) by analyzing a suite of dynamic and thermodynamic parameters. Results reveal a slower northward propagation of MISO in all models with the characteristic northwest–southeast tilted rain band missing over India. The anomalous moisture convergence and vorticity were collocated with the convection center instead of being northwards. This affected the northward propagation of MISO. The easterly shear to the north of the equator was better simulated by the coarser resolution models than CFS T382. The low level specific humidity showed improvement only in CFS T382 until ~15° N. The analyses of the vertical profiles of moisture and its relation to rainfall revealed that all CFSv2 resolutions had a lower level of moisture in the lower level (< 850 hPa) and a drier level above. This eventually hampered the growth of deep convection in the model. These model shortcomings indicate a possible need of improvement in moist process parameterization in the model in tune with the increase in resolution. View Full-Text
Keywords: Indian Summer Monsoon; Monsoon Intraseasonal Oscillation (MISO); Climate Forecast System (CFSv2) Indian Summer Monsoon; Monsoon Intraseasonal Oscillation (MISO); Climate Forecast System (CFSv2)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Tirkey, S.; Mukhopadhyay, P.; Krishna, R.P.M.; Dhakate, A.; Salunke, K. Simulations of Monsoon Intraseasonal Oscillation Using Climate Forecast System Version 2: Insight for Horizontal Resolution and Moist Processes Parameterization. Atmosphere 2019, 10, 429.

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