GSI

GFS-GSM

CFS

HWRF

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DOCUMENTATION	NCEP/DTC	MoES
GSI	GSI Documents and Publications (DTC)
GFS-GSM	Documentation (NCEP/EMC) References	Performance of T254L64, T382L64 and GEFS Global Assimilation Forecast System (NCMRWF) - Monsoon-2008 (pdf), Monsoon-2009 (pdf),Monsoon-2010 (pdf),Monsoon-2012 (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)	Development of Extended range prediction system using CFSv2 and its verification - Report(pdf)

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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!)

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TERMS & ACRONYMS

3D/4D-Var	Three/Four Dimensional Varioational Method (for data asssimilation)
4DDA	Four Dimensional Data Assimilation (for data asssimilation)
AC	Anomaly Correlation
CFS	Climate Forecast System
CFSv2	Climate Forecast System version 2.0.0
CPC	Climate Prediction Center (NCEP) - visit website
DTC	Developmental Testbed Center (Boulder, CO) - visit website
ECMWF	European Centre for Medium-Range Weather Forecasts, Europe - visit website
EMC	Environmental Modeling Center (NCEP) - visit website
EnKF	Ensemble Kalman Filter (data asssimilation method)
ESSO	Earth System Sciences Organisation, India
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
INCOIS	Indian National Centre for Ocean Information Services - visit website
MISO	monsoon intraseasonal oscillations - visit website
MoES	Ministry of Earth Sciences, India - visit website
MOK	Monsoon over Kerala, onset of Monsoon in India - visit website
MOM4	Modular Ocean Model is the Ocean Model in GFS, developed by GFDL - visit website
NCEP	National Centres for Environmental Prediction, USA - 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
T574	Triangular Spectral truncation. Domain shape is in spectral space and traingular is isotropic on sphere. 574 is the maximum number of waves around a great circle in any direction ; so the shortest wavelength is 40,000/574 = 70 km. Eulerian Global Spectral Model (GSM) uses 3 gridpoints per wave, on tranform grid of "1760 X 880" reduced Gaussian grid. The horizontal resolution at T574 becomes ~ 23 km
T382	Spectral truncation equivalent to horizontal resolution ~37 km
T254	Spectral truncation equivalent to horizontal resolution ~50-55 km
T190	Spectral truncation equivalent to horizontal resolution ~70 km
T126	Spectral truncation equivalent to horizontal resolution ~100 km
UM	Unified Model by British Met Office, UK - visit website

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