TIGGE Data Archive and Access at NCAR

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TIGGE Data Archive and Access at NCAR

• November 2008
• Steven Worley
• National Center for Atmospheric Research
• Boulder, Colorado, U.S.A.

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Topic Outline

• Project Definition
• Archive Summary
• Data Description
• Provider Summary
• NCARs portal and access

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Project Outline

• TIGGE, the THe Observing System Research and
  Predictability EXperiment (THORPEX) Interactive
  Grand Global Ensemble
• WMO World Weather Research Programme
• Goal, accelerate improvements in 1-day to 14-day
  high-impact weather forecasts
• How
• Enhanced international collaboration on ensemble
  prediction
• New methods for combining ensembles from
  different sources
• Deeper understanding of forecast errors
• Purpose
• Prototype for a future Global Interactive
  Forecast System (GIFS)

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Phase I Archive Centers

• Archive Centers
• NCAR
• ECMWF
• China Meteorological Administration (CMA)
• Archive Centers build identical archives, i.e.
  all the data.

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TIGGE Archive Centers and Data Providers
UKMO
CMC
CMA
ECMWF
MeteoFrance
NCAR
NCEP
JMA
KMA
IDD/LDM
HTTP
FTP
Archive Centre
CPTEC
Current Data Provider
BoM
IDD/LDM Internet Data Distribution / Local Data
Manager Commodity internet application to send
and receive data
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Brief 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 (?)
• ?, U, V on ? 2 potential vorticity surface
• 28 Surface/Single level parameters

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• Summary of Data Providers, March 08

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TIGGE Archive Completeness, 02/2008
PL Pressure Level, PT 320K Theta Level, SL
Single/Surface Level
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TIGGE Archive Completeness, 02/2008
PL Pressure Level, PT 320K Theta Level, SL
Single/Surface Level
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The Data Management Challenges

• Anomalies between centers

• Native horizontal resolution
• Number of ensemble members
• Number of forecast initialization times (1, 2, 4x
  daily)
• Forecast increment time period
• Forecast length
• Number of fields provided
• Internal file compression (e.g. jpg) was not
  specified

Influence on Research

• User interface must inform users - commonalities
  constrain research

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NCAR TIGGE Portal

• Address http//tigge.ucar.edu
• Main Features
• Registration and Login
• Get Data
• User Tools
• Documentation and Linkages
• Technical and Community Supported Help

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Dates
Center
File Type
Forecast Time
Forecast Duration
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Get Forecast Data
Two User Interfaces

• NCAR online file archive
• Selection options
• Center(s)
• Date
• File type (sl, pl, etc)
• Initialization time
• Forecast length

• User customized files
• Selection options
• Same as for files, plus
• Parameter
• Regridding
• Spatial subsets
• Formats, GRIB2, netCDF

Delayed Mode
Real Time

• 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

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Tropical Cyclone Track Data

• Direct Download Only, ltCXMLgt format
• Simple directory system, center/year/month
• Web address, dss.ucar.edu/datasets/ds330.3

• Update Frequency
• 12 hours
• Size
• 6GB

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Public Announcement

• EOS, Transactions, American Geophysical Union,
  Vol. 89, Number 36, September 2, 2008
• Title Improving High-Impact Weather Forecasts
• Included an online supplement

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• END
• Steven Worley
• worley_at_ucar.edu