1. 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

2. Indian summer monsoon
MEAN STATE
Sunday, April 28, 2019

3. 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”

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

5. Systematic Biases of CFS
CFSv1
CFSv2
Seasonal (JJAS) averaged climatological mean tropospheric temperature (degree C) deviation from NCEP
Saha et. al. 2013

6. Systematic Biases of CFS
Sunday, April 28, 2019

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

9. Annual Cycle of Rainfall. (mm/day)
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10. 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.
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11. 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.
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12. Ratio of Synoptic to ISO variance.
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13. T62
T382
T126
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14. T62
T126
T382
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15. 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

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

17. THANK YOU
Sunday, April 28, 2019

18. END
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19. Sunday, April 28, 2019

20. Tropospheric temperature bias, wrt NCEP
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21. 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

22. Goswami and Xavier 2005
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