Application of MJO simulation diagnostics to climate model simulations. Authors.
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MJO simulation diagnostics
to climate model simulations
Daehyun Kim1 , D. E. Waliser2, K. R. Sperber3 , L Donner4, J. Gottschalck5, H. H. Hendon6, W. Higgins5, I.-S. Kang1, E. D. Maloney7, M. W. Moncrieff8, S. Schubert9, W. Stern4, F. Vitart10 , B. Wang11, W. Wang5, K. M. Weickmann12, M. C. Wheeler6, S. Woolnough13,C. Zhang14, M. Khairoutdinov15, M.-I. Lee9, R. Neale8, D. Randall7, M. Suarez9, and G. Zhang16
1SEES/Seoul National University, Korea, 2JPL/California Institute of Technology, USA, 3PCMDI/Lawrence Livermore National Laboratory, USA, 4 GFDL/NOAA, USA, 5Climate Prediction Center/NCEP/NOAA, USA, 6Bureau of Meteorology Research Center, Australia, 7Colorado State University, USA 8National Center for Atmospheric Research, USA, 9Goddard Space Flight Center/NASA, USA 10European Centre for Medium-Range Weather Forecasts, UK, 11IPRC/University of Hawaii, USA, 12Climate Diagnostics Center/NOAA, USA, 13Univertisy of Reading, UK, 14RSMAS/University of Miami, USA, 15Stony Brook University, USA, 16Scripps Institution of Oceanography, USA
VP200, ECMWF forecast
Vitart et al. (2007)
MJO Variance(eastward wavenumber 1-6, periods 30-70days)
(Lin et al. 2006)
* Only 2 models have comparable amplitude to OBS
(IPCC AR4 14 models)
MJO Simulation Diagnostics: http://climate.snu.ac.kr/mjo_diagnostics/index.htm
Calculation codes and example data
- Needs feedback
1. How well the current climate models simulate MJO?
Large-scale circulation vs. Convection
(850hPa zonal wind) (Precipitation)
2. What are the shortcomings of the models (models’ convection)?
PBL convergence - PRCP
Relative Humidity – PRCP (Trigger function)
*: flux adjustment for heat and fresh water
Wavenumber 1 power spectra for 200hPa velocity potential
(Slingo et al. 1996)
* Spectral peak in 30-70 day period is NOT appeared in models
MJO signal in large-scale circulation
(850hPa zonal wind)
MJO signal in convection
Improper relationship between them?
Are they maintained in different way from observation?
Correlation map between PRCP and 925hPa convergence
(20-100day filtered): initiation and strength
CCM3.6 with McRAS
Maloney and Hartmann (2001)
PRCP - PBL convergence
Unrealistic phase relationship instead of improved MJO variability
Warm Pool region
from Prof. David A. Randall’s
presentation at MJO Workshop (Nov. 2007)
Composite RHbased on PRCP
Warm Pool region