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Monsoon Desk
| GSI |
GFS-GSM |
CFS |
HWRF |
__________________________________________________________________________________________________________________
| DOCUMENTATION | NCEP/DTC | MoES |
| GSI | GSI Documents and Publications (DTC) GSI User Guide v3.0 (DTC) Introduction of the GSI into the NCEP Global Data Assimilation System (full ref) (NCEP) |
|
| GFS-GSM | Documentation (NCEP/EMC) References |
Performance of T254L64 Global Assimilation Forecast System (NCMRWF) - Monsoon-2008 (pdf), Monsoon-2009 (pdf) Experimental real-time multi-model ensemble (MME) prediction of rainfall during monsoon 2008: Large-scale medium-range aspects (pdf) (NCMRWF) |
| CFS | Documentation (NCEP/EMC) |
INITIAL CONDITIONS
GFS-GSM
Obtain ICs from NOMADS: 1-month rotating GDAS/GFS archive (gdas.YYYYMMDD or gfs.YYYYMMDDCC)
| Parallel Convention | <-- | Operational Convention | ||
| biascr.CDUMP.CDATE | <-- | CDUMP.tCCz.abias | A, N | CDATE = YYYYMMDDCC (year, month, day, cycle), CC = cycle CDUMP = dump (gdas1 or gfs) A - required if cycling with analysis F - required if running forecast N - not available for gfs dump |
| satang.CDUMP.CDATE | <-- | CDUMP.tCCz.satang | A, N | |
| sfcanl.CDUMP.CDATE | <-- | CDUMP.tCCz.sfcanl | A, F | |
| siganl.CDUMP.CDATE | <-- | CDUMP.tCCz.sanl | A, F |
CFSv2
Obtain ICs from NOMADS: 7-day rotating CDAS archive (cdas.YYYYMMDD)
| Parallel Convention | <-- | Operational Convention | CDATE = YYYYMMDDCC (year, month, day, cycle), CC = cycle A - required if cycling with analysis F - required if running forecast | |
| biascr.gdas.CDATE | <-- | cdas1.tCCz.abias | A | |
| satang.gdas.CDATE | <-- | cdas1.tCCz.satang | A | |
| sfcanl.gdas.CDATE | <-- | cdas1.tCCz.sfcanl | A, F | |
| siganl.gdas.CDATE | <-- | cdas1.tCCz.sanl | A, F | |
| ocnanl.gdas.CDATE.tar | <-- | cdas1.tCCz.ocnanl.tar | A, F |
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TUTORIAL
Basic how-to-run steps for GFS and CFS (assumes model/system is installed and working and that all scripts/code are under a para directory structure):
- Setup directories
- EXPDIR - experiment directory, where your configuration file, rlist, and other necessary text files and scripts live
- ROTDIR - rotating directory, where initial conditions are placed before run and where output from run will appear
- DATATMP - temporary working directory, usually scrub space
- Obtain initial conditions (ICs)
- See Initial Condition file information above
- Place initial condition files in ROTDIR prior to run
- Setup configuration file
- Obtain sample configuration file (from para/exp directory or elsewhere)
- Adjust variable settings in configuration file for your run (more information on this coming!)
- Submit run
- Using psub (recommended to be run from EXPDIR)
- psub script - found in para/bin
- wrapper script that utilized the sub script to submit each step of the run
- run with command line arguments: $PSUB $CONFIG $CDATE $CDUMP $CSTEP
- Where:
- $PSUB = full path location of psub script (example: $HOMEDIR/para/bin/psub, where $HOMEDIR is rest of path)
- $CONFIG = name of configuration (including path of file if not submitting run inside EXPDIR)
- $CDATE = YYYYMMDDCC, starting cycle of run
- $CDUMP = gdas or gfs*, starting dump of run (* not option for CFS runs)
- $CSTEP = starting step of run (recommended that first time users start on "fcst1" step)
- Using submit script (information coming soon!)
- Using psub (recommended to be run from EXPDIR)
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TERMS & ACRONYMS
| CFS | Climate Forecast System |
| CFSv2 | Climate Forecast System version 2.0.0 |
| DTC | Developmental Testbed Center (Boulder, CO) |
| GDAS | Global Data Assimilation System, the late run of the GFS, a short 9-hr forecast utilizing late arriving data, provides guess fields / initial conditions for next GFS cycle. Example: 18z GDAS provides initial conditions for 00z GFS |
| GFS | Global Forecast System (entire suite of systems: GSI, GSM, CFS), commonly used to refer to forecast output from entire coupled system although forecast actually comes from the GSM |
| GSI | Gridpoint Statistical Interpolation, GFS data assimilation system |
| GSM | Global Spectral Model, forecast model in GFS |
| HWRF | Hurricane Weather Research and Forecast System - visit website |
| IC(s) | initial condition(s) for model |
| IITM | Indian Institute of Tropical Meteorology - visit website |
| IMD | India Meteorological Department - visit website |
| MoES | Ministry of Earth Sciences, India - visit website |
| NCMRWF | National Centre for Medium Range Weather Forecasting (Noida, India) - visit website |
| NOMADS | NOAA National Operational Model Archive and Distribution System (NOMADS) is a Web-services based project providing both real-time and retrospective format independent access to climate and weather model data |
REFERENCES
ASIAN MONSOON IN CFS
Gao, H., S. Yang, A. Kumar, Z.-Z. Hu, B. Huang, Y. Li, and B. Jha, 2011: Variations of the East Asian Mei-yu and simulation and prediction by the NCEP Climate Forecast System. J. Climate, 24, 94-108.
Wen, M., S. Yang, A. Vintzileos, W. Higgins, and R. Zhang, 2011: Impacts of model resolutions and initial conditions on predictions of the Asian summer monsoon by the NCEP Climate Forecast System. To be submitted.
Yang, S., M. Wen, R. Yang, W. Higgins, and R. Zhang, 2011: Impacts of land process on the onset and evolution of Asian summer monsoon in the NCEP Climate Forecast System. Adv. Atmos. Sci., in press.
Zuo, Z., S. Yang, W. Wang, A. Kumar, Y. Xue, and R. Zhang, 2011: Relationship between anomalies of Eurasian snow and southern China rainfall in winter. Environ. Res. Lett., conditionally accepted.
Li, Y., and S. Yang, 2010: A dynamical index for the East Asian winter monsoon. J. Climate, 23, 4255-4262.
Liang, J., S. Yang, Z.-Z. Hu, B. Huang, A. Kumar, and Z. Zhang, 2009: Predictable patterns of Asian and Indo-Pacific summer precipitation in the NCEP CFS. Climate Dynamics, 32, 989-1001.
Yang, S., M. Wen, and R. W. Higgins, 2008: Sub-seasonal features of the Asian summer monsoon in the NCEP Climate Forecast System. ACTA Oceanologica Sinica, 27, 88-103.
Yang, S., Z. Zhang, V. E. Kousky, R. W. Higgins, S.-H. Yoo, J. Liang, and Y. Fan, 2008: Simulations and seasonal prediction of the Asian summer monsoon in the NCEP Climate Forecast System. J. Climate, 21, 3755-3775.
GSI/GDAS
Introduction of the GSI into the NCEP Global Data Assimilation System
Daryl T. Kleist, David F. Parrish, John C. Derber, Russ Treadon, Wan-Shu Wu, Stephen Lord
Weather and Forecasting
Volume 24, Issue 6 (December 2009) pp. 1691-1705
doi: 10.1175/2009WAF2222201.1