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[email protected] 2011
TIGGE, TIGGE LAM and the GIFS
T. Paccagnella (1), D. Richardson (2), D. Schuster(3), R. Swinbank (4), Z. Toth (3), S. Worley (3)……………….
…………………………………………..
(1) ARPA-SIMC, Italy(2) ECMWF, UK(3) NCAR, USA4) Met Office, UK
[email protected] 2011
TIGGE data
A phased approach was chosen beginning with mirrored data collections of global medium-range ensemble forecasts from 10 NWP providers at three TIGGE Archive Centres: CMA, ECMWF, and NCAR.
TIGGE data is made available for research after a 48-hour delay. Near real-time access may be granted for specific projects through the THORPEX International Project Office.
[email protected] 2011
Summary of TIGGE
database
CentreEnsemblemembers
Output dataresolution
Forecastlength
Forecasts per day
Fields (out of 73)
Start date
BOM 33 1.50º x 1.50º 10 day 2 55 3 Sep 07
CMA 15 0.56º x 0.56º 10 day 2 60 15 May 07
CMC 21 0.9º x 0.9º 16 day 2 56 3 Oct 07
CPTEC 15 0.94º x 0.94º 15 day 2 55 1 Feb 08
ECMWF 51
N200 (Reduced Gaussian)
N128 after day 10
15 day 2 70 1 Oct 06
JMA 51 0.56º x 0.56º 9 day 1 61 1 Oct 06
KMA 17 1.00º x 1.00º 10 day 2 46 28 Dec 07
Météo-France
11 1.50º x 1.50º 2.5 day 2 62 25 Oct 07
NCEP 21 1.00º x 1.00º 16 day 4 69 5 Mar 07
UKMO 24 0.83º x 0.55º 15 day 2 71 1 Oct 06
Ten of the leading global forecast centres are providing regular ensemble predictions to support research on predictability, dynamical processes and development of probabilistic forecasting methods.
The TIGGE Archives have great value for the users, because standards for data format, parameter fields, and transfer protocols were internationally agreed upon at the start.
TIGGE ARCHIVES CHARACTERISTICS
All data are archived at native resolution (on native grid when possible)
Data are interpolated on any limited-area lat-lon grid defined by the user just before download
Field names, definitions, units, accumulation times, etc… are fully standardized
Data gaps are continuously monitored and every effort is made to repair them quickly
Data can be obtained either in GRIB2 or NETCDF format (only from NCAR at the moment)
More functionalities will be installed (e.g. access to single point data, automatic requests, local calculation and plot generation, etc…) depending on user numbers, requests and funding
The ICT systems run 24 hours per day x 7 days per week, collecting data from the providers, validating the data integrity and completeness, and supporting user access.
Currently, the TIGGE archive is growing with more than over 1.7 M fields and 500 GB per day.
User activity continues to improve. Currently approximately 50 active users (submitting multiple requests) trigger data processing on 15 TB and download 1 TB monthly.
TIGGE ARCHIVES CHARACTERISTICS
Fast user access to the complete archive, now 425 TB, is a technical challenge.
Delivery systems at ECMWF are fairly well suited to this challenge, while NCAR has found it necessary to place more data online and boost server side computational power. A new validation data portal is being designed and will be coupled to the TIGGE access portal at NCAR. Having the forecast fields and observations available from the same interface will further support the TIGGE program objectives.
TIGGE ARCHIVES CHARACTERISTICS
