tigge data archive and access at ncar november 2008 november 2008 steven worley national center for...
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TIGGE Data Archive and Access at TIGGE Data Archive and Access at NCARNCAR
November 2008November 2008
Steven WorleySteven Worley
National Center for Atmospheric ResearchNational Center for Atmospheric Research
Boulder, Colorado, U.S.A.Boulder, Colorado, U.S.A.
Topic OutlineTopic Outline
Project DefinitionProject Definition Archive SummaryArchive Summary Data DescriptionData Description Provider SummaryProvider Summary NCAR’s portal and accessNCAR’s portal and access
Project OutlineProject Outline
TIGGE, the THe Observing System Research and Predictability TIGGE, the THe Observing System Research and Predictability EXperiment (EXperiment (TTHORPEX) HORPEX) IInteractive nteractive GGrand rand GGlobal lobal EEnsemblensemble
WMO World Weather Research ProgrammeWMO World Weather Research Programme Goal, accelerate improvements in 1-day to 14-day high-Goal, accelerate improvements in 1-day to 14-day high-
impact weather forecastsimpact weather forecasts HowHow
– Enhanced international collaboration on ensemble predictionEnhanced international collaboration on ensemble prediction– New methods for combining ensembles from different sourcesNew methods for combining ensembles from different sources– Deeper understanding of forecast errorsDeeper understanding of forecast errors
PurposePurpose– Prototype for a future Global Interactive Forecast System (GIFS)Prototype for a future Global Interactive Forecast System (GIFS)
Phase I Archive CentersPhase I Archive Centers
Archive CentersArchive Centers NCARNCAR ECMWFECMWF China Meteorological Administration (CMA)China Meteorological Administration (CMA)
Archive Centers build identical archives, i.e. all the Archive Centers build identical archives, i.e. all the data.data.
TIGGE Archive Centers and Data Providers
Archive Centre
Current Data Provider
NCAR NCEP
CMC
UKMO
ECMWFMeteoFrance
JMAKMA
CMA
BoMCPTEC
IDD/LDM
HTTP
FTP
IDD/LDM
Internet Data Distribution / Local Data Manager
Commodity internet application to send and receive data
Brief Data DescriptionBrief Data Description
Global Ensemble Forecasts
Five parameters on eight pressure levels• Z, Q, T, U, V• 1000, 925, 850, 700, 500, 300, 250, 200 hPa
Z at 50 hPa
Potential Vorticity on 320 K Potential Temperature Surface (θ)
θ, U, V on 2 potential vorticity surface
28 Surface/Single level parameters
Summary of Data Providers, March ‘08Summary of Data Providers, March ‘08
Center Conforming Parameters
Ens. Members
Model Res.
Fcst Length
Fcsts/ Day
GB/ Day
Fields/ Day
Files/ Day
ECMWF (ecmf)
70/73 51 N200 (Reduced Gaussian)
10 day 2 115 289,734 328
ECMWF (ecmf)
70/73 51 N128 (Reduced Gaussian)
10-15 day
2 24 138,978 160
UKMO (egrr)
70/73 24 1.25 x 0.83 Deg 15 day 2 21 175,680 488
JMA (rjtd)
61/73 51 1.25 x 1.25 Deg 9 day 1 7 113,192 74
NCEP (kwbc)
59/73 21 1.00 x 1.00 Deg 16 day 4 10 316,596 1040
CMA (babj)
60/73 15 0.56 x 0.56 Deg 10 day 2 28 72,510 82
CMC (cwao)
56/73 21 1.00 x 1.00 Deg 16 day 2 8 163,674 260
BOM (ammc)
55/73 33 1.50 x 1.50 Deg 10 day 2 8 147,972 164
MF (lfpw)
62/73 11 1.50 x 1.50 Deg
2.5 day
1 .15 7,558 33
KMA (rksl)
46/73 17 1.00 x 1.00 Deg 10 day 2 5 64,124 164
CPTEC (sbsj)
55/73 15 1.00 x 1.00 Deg 15 day 2 14 97,084 244
Total 22 240 1,587,102 3,037
Variable LvL ECWF UKMO JMA NCEP CMA CMC BOM MetF KMA CPTC
Geopotential Z PL
Specific H PL
T PL
U-velocity PL
V-velocity PL
Potential Vor PT
Potential T PV
U-velocity PV
V-Velocity PV
U 10m SL
V 10m SL
CAPE SL
Conv. Inhib. SL
Land-sea SL
Mean SLP SL
Orog. SL
Skin T SL
Snow D. H20 SL
Snow F. H20 SL
TIGGE Archive Completeness, 02/2008
PL = Pressure Level, PT = 320K Theta Level, SL = Single/Surface Level
Variable LvL ECWF UKMO JMA NCEP CMA CMC BOM MetF KMA CPTC
Soil Moist. SL
Soil T SL
Sunshine D. SL
Surf. DPT SL
Surf. ATmax SL
Surf. ATmin SL
Surf. AT SL
Surf. P SL
LW Rad. Out SL
LH flux SL
Net Rad SL
Net Therm. Rad SL
Sensible Rad. SL
Cloud Cov SL
Column Water SL
Precipitation SL
Wilt. Point SL
Field Cap. SL
TIGGE Archive Completeness, 02/2008
PL = Pressure Level, PT = 320K Theta Level, SL = Single/Surface Level
The Data Management ChallengesThe Data Management Challenges
Anomalies between centersAnomalies between centers Native horizontal resolutionNative horizontal resolution Number of ensemble membersNumber of ensemble members Number of forecast initialization times (1, 2, 4x daily)Number of forecast initialization times (1, 2, 4x daily) Forecast increment time periodForecast increment time period Forecast lengthForecast length Number of fields providedNumber of fields provided Internal file compression (e.g. jpg) was not specifiedInternal file compression (e.g. jpg) was not specified
Influence on ResearchInfluence on Research
User interface must inform users - commonalities constrain User interface must inform users - commonalities constrain researchresearch
NCAR TIGGE Portal NCAR TIGGE Portal
Address: Address: http://tigge.ucar.edu
Main FeaturesMain Features– Registration and LoginRegistration and Login– Get DataGet Data– User ToolsUser Tools– Documentation and LinkagesDocumentation and Linkages– Technical and Community Supported HelpTechnical and Community Supported Help
Dates
Center
File Type
Forecast Time
Forecast Duration
Get Forecast Data
NCAR online file archive
• Selection options•Center(s)•Date•File type (sl, pl, etc)•Initialization time•Forecast length
Download Options• Point and click using browser, one file at a time• Script to run on local machine
•User and password encrypted ‘wget’ commands• background process to access all files
User customized files
• Selection options•Same as for files, plus•Parameter•Regridding•Spatial subsets•Formats, GRIB2, netCDF
Delayed ModeReal Time
Two User Interfaces
Tropical Cyclone Track DataTropical Cyclone Track Data
Direct Download Only, <CXML> format•Simple directory system, center/year/month•Web address, dss.ucar.edu/datasets/ds330.3
Update Frequency
• 12 hours
Size
• 6GB
Public AnnouncementPublic Announcement
EOS, Transactions, American EOS, Transactions, American Geophysical Union, Vol. 89, Number 36, Geophysical Union, Vol. 89, Number 36, September 2, 2008 September 2, 2008 – Title: Improving High-Impact Weather Title: Improving High-Impact Weather
ForecastsForecasts– Included an online supplement Included an online supplement