Is Superparameterization Capable of Breaking The “Deadlock”

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Presentation transcript:

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 1University of Victoria, Canada; 2Indian Institute of Tropical Meteorology, India; 3Stony Brook University, USA

Indian summer monsoon MEAN STATE Sunday, April 28, 2019

Indian summer monsoon (ISM) rainfall is contributed by … Low Frequency oscillation mode (LFM) 30–60 day north-east ward propagation. High Frequency oscillation mode (HFM) 10–20 day westward propagation. To start with, “READ OUT”

Superparameterized CFSv2-T62 (SP-CFS) 4km 64 levels CFS 664 days (21-May-2008 to 15-March-2010)

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 Sunday, April 28, 2019

Results Sunday, April 28, 2019

JJAS mean Rainfall (mm/day) Pattern correlation = 0.8 Pattern correlation = 0.7 Sunday, April 28, 2019

Annual Cycle of Rainfall. (mm/day) Sunday, April 28, 2019

easterly wind shear (U200–U850, m s-1 Low level speciﬁc humidity (g kg-1) Tropospheric temperature (averaged between 200 and 600 hPa) Equivalent potential temperature (averaged between 1000 to 850 hPa and 65 to 95E. Sunday, April 28, 2019

Power spectra We did not perform ay significance test as we did not want to challenge the significance of the results by doing a significance test of the plot. Sunday, April 28, 2019

Ratio of Synoptic to ISO variance. Sunday, April 28, 2019

T62 T382 T126 Sunday, April 28, 2019

T62 T126 T382 Sunday, April 28, 2019

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. Sunday, April 28, 2019

Is Superparameterization Capable of Breaking The “Deadlock” Is Superparameterization Capable of Breaking The “Deadlock” ? ... Seeking The Answer in Superparameterized CFSv2 664-Day Climate YES !!!

THANK YOU Sunday, April 28, 2019

END Sunday, April 28, 2019

Sunday, April 28, 2019

Tropospheric temperature bias, wrt NCEP Sunday, April 28, 2019

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. Sunday, April 28, 2019 PhD Defence Seminar Idea proposed by W. Grabowski 1999

Goswami and Xavier 2005 Sunday, April 28, 2019