Is Superparameterization Capable of Breaking The Deadlock ?
Is Superparameterization Capable of Breaking The Deadlock ? ... Seeking The Answer in Superparameterized CFSv2 664-Day Climate B.B. Goswami1, R. Phani2, P. Mukhopadhyay2, M. Khairoutdinov3, B.N. Goswami2 1 University of Victoria, Canada; 2Indian Institute of Tropical Meteorology, India; 3Stony Brook University, USA
Indian summer monsoon MEAN STATE 2/13/20 2 Indian summer monsoon (ISM) rainfall is contributed by
Low Frequency oscillation mode (LFM) 3060 day north-east ward propagation.
High Frequency oscillation (HFM) 1020 day westward propagation. mode
Superparameterized CFSv2-T62 (SP-CFS) 664 days (21-May-2008 to 15-March2010) T62 64 levels CFS 4km
Systematic Biases of CFS CFSv1 CFSv2 Seasonal (JJAS) averaged climatological mean tropospheric temperature (degree C) deviation from NCEP Saha et. al. 2013
Systematic Biases of CFS 2/13/20 6 Results 2/13/20
easterly wind shear (U200U850, m s-1 Low level specic humidity (g kg-1) Tropospheric temperature (averaged between 200 and 600 hPa)
2/13/20 Equivalent potential temperature (averaged between 1000 to 850 hPa and 65 to 95E. Power spectra 2/13/20
11 Ratio of Synoptic to ISO variance. 2/13/20 12 T62 T382
T126 2/13/20 13 T62 T126
T382 2/13/20 14 Remark: Possibly the CRMs in the SP framework precondition the moisture field (Waite and Khouider 2010) thereby creating favorable conditions for the deeper convections to
follow. Khouider and Majda 2008 has demonstrated that these sequences of evolution of convection can explain the convectively coupled equatorial waves. 2/13/20 15 Is Superparameterization Capable of Breaking The
Deadlock ? ... Seeking The Answer in Superparameterized CFSv2 664-Day Climate YES !!! THANK YOU 2/13/20
17 END 2/13/20 18 2/13/20 19
Tropospheric temperature bias, wrt NCEP (c) 2/13/20 20 Superparameterization
CRM CRM CRM CRM CRM CRM
CRM CRM CRM Convective tendencies are explicitly simulated with a Cloud Resolving Model running in each GCM grid column which replaces the traditional cumulus parameterization of the GCM.
2/13/20 PHD DEFENCE SEMINAR 21 Idea proposed by W. Grabowski Goswami and Xavier 2005 2/13/20 22
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