wdcgg 20090625. outline what is wdcgg how wdcgg works data information –data type –data format...
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WDCGG
20090625
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Outline
• What is WDCGG
• How WDCGG works
• Data information– Data type– Data format
• download
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• GAW programme – six GAW World Data Centres (WDCs)
• Greenhouse Gases• Ozone/ UV• Precipitation Chemistry• Solar Radiation• Aerosols• Remote Sensing of the Atmosphere
What is WDCGG
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Gathering parameters
• greenhouse gases and related gases • in the atmosphere and the ocean
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GAW Station Information System (GAWSIS)
• An up-to-date, searchable database– station descriptions– measurement programmes– GAW network– parameters of greenhouse gases.
• http://gaw.empa.ch/gawsis/
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Gas measurement parameters
• Measurement parameter Parameter code– Carbon dioxide co2– Methane ch4– Nitrous oxide n2o– sulfur hexafluoride sf6– …………
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Classifications -according to the observation platforms or methods • Air sampling observation at ground-based
stations • Air sampling observation for vertical profiles (e.g.
multi-height observation using a tower) • Air sampling observation by mobile platforms
(e.g. aircraft, ships, etc.) • Ice core observation • Surface seawater and overlying atmosphere
observation • Hydrographic sampling observation by ships
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Fixed stations
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Temporal representation of gathering data
• one-minute mean (mobile only)
• ten-minute mean
• hourly mean
• Daily mean
• monthly mean
• event sample data
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Data type• Observation data:
– measurement data • gas mole fractions• relevant data (data flag, standard deviation, the
number of data used to average, etc.) • (optional) coincident ancillary data (associated
meteorological data). • (optional) measurement locations (latitude and
longitude, etc.) (mobile platforms).
– Metadata
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• Observation data: – measurement data – Metadata
• additional information for observation – observatory locations, Sampling conditions, – measurement methods, calibrations, – traceability of employed scale, – Quality management information, etc.
• to keep metadata up-to-date
Data type
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Data format
• header part,space-delimited, fixed length data part.
• the data part : FORTRAN fitting format.
• Each file contains mole fraction values of only one parameter
• ancillary data such as meteorological data are stored in a different file from the mole fractions file.
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Example - a gas mole fractions file
• 01 TITLE: Observation title (parameter, temporal representative, etc.)
• 02 FILE NAME: File name
• ……………
• C30 COMMENT:• DATE TIME DATE TIME DATA ND SD F CS REM
• 1987-01-01 01:00 9999-99-99 99:99 345.100 41 1.368 ... 0 -99999999
• 1987-01-01 02:00 9999-99-99 99:99 352.350 21 2.142 ... 0 -99999999
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Download
• Data type– Disseminated data files (measurement data)– The metadata are viewed on the website.
• Download– http– ftp
• Web site– http://gaw.kishou.go.jp
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