WDCGG

20090625

Outline

• What is WDCGG

• How WDCGG works

• Data information– Data type– Data format

• download

• 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

Gathering parameters

• greenhouse gases and related gases • in the atmosphere and the ocean

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/

Gas measurement parameters

• Measurement parameter Parameter code– Carbon dioxide co2– Methane ch4– Nitrous oxide n2o– sulfur hexafluoride sf6– …………

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

Fixed stations

Temporal representation of gathering data

• one-minute mean (mobile only)

• ten-minute mean

• hourly mean

• Daily mean

• monthly mean

• event sample data

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

• 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

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.

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

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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