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WDCGG Data Submission and Dissemination Guide (PDF 1.2Mbyte)

WDCGG leaflet (PDF 2.7MByte, July 2008)


Introduction to the WMO WDCGG


1. Global Atmosphere Watch (GAW)

The Global Atmosphere Watch (GAW) programme of WMO (http://www.wmo.int/gaw) coordinates global atmospheric chemistry observations, analysis and scientific assessments related to the changing composition of the Earth's atmosphere and its effects on weather, climate, water and the environment. GAW is the lead programme for implementing recommendations of the Global Climate Observing System (GCOS) on the essential climate variables (greenhouse gases, ozone and aerosols). It is a major contributor to the Global Earth Observation System of Systems (GEOSS) coordinating integrated global atmospheric chemistry observations and research for greenhouse gases, ozone, aerosols, reactive gases and precipitation chemistry.

The mission of GAW is to:

  • reduce environmental risks to society and meet the requirements of environmental conventions
  • strengthen capabilities to predict climate, weather and air quality
  • contribute to scientific assessments in support of environmental policy
These goals are pursued through:
  • maintaining and applying global, long-term observations of the chemical composition and selected physical characteristics of the atmosphere
  • emphasising quality assurance and quality control
  • delivering integrated products and services of relevance to users.

Global observations are archived and made available by GAW World Data Centres (WDC). The purpose of the WDCs is to collect and archive processed GAW data, to make them publicly available, and to provide support in the quality assurance, analysis and interpretation of these data for scientific advances and policy decisions. The WDCs are committed to align their operations to the needs of data submitters and data users alike.



2. History and objectives of the WDCGG

The WDCGG, one of the WDCs under WMO's GAW programme, has been operating since October 1990 at the Japan Meteorological Agency (JMA). In October 2002, the WDCGG took over the role of the World Data Centre for Surface Ozone (WDCSO) from the Norwegian Institute for Air Research (NILU).

Furthermore, under an agreement between the Global Climate Observing System (GCOS) and WMO/GAW that considers the WMO/GAW global atmospheric CO2 and CH4 monitoring network as a comprehensive network of GCOS, the WDCGG is charged with data management and dissemination of value-added products on these species in order to facilitate more reliable monitoring and data analysis.

The objectives of the WDCGG are to support scientific research, assessment and correspondence policy for environmental issues such as global warming, ultimately to contribute toward reducing societal environmental risks and to meet the requirements of related environmental conventions.



3. Functions of the WDCGG

Since its establishment in 1990, the WDCGG has been principally working to achieve its objectives. In addition, the WDCGG has improved its operation and functions in accordance with GAW Strategic Plans. The current operations of the WDCGG are composed of the following four functions:

  • To collect measurement data and associated metadata of greenhouse and related trace gas species from various platforms of the GAW observation network and relevant international research programmes
  • To archive the data of known quality for long-term use after validation
  • To make the archived data available to users via the Internet
  • To disseminate value-added products and user support information in order to facilitate more reliable monitoring and data analysis.



Schematic diagram of the functions of the WDCGG and the flow of data


4. Archived parameters

The WDCGG archives measurement data for greenhouse and related gases in the atmosphere and the ocean (77 gaseous species as of 31 December 2009). The data are classified into six categories according to the observation platforms or methods used (see WDCGG Data Submission and Dissemination Guide).

  • Air observation at stationary platform
  • Air observation by mobile platforms (e.g. aircraft, ships, etc.)
  • Vertical profile observation of air (e.g. multi-height observation using a tower)
  • Hydrographic sampling observation by ships
  • Ice core observation
  • Observation of surface seawater and overlying air




This site is operated by the Japan Meteorological Agency
in cooperation with the World Meteorological Organization
(Created : 2001/07/02    Updated : 2013/07/03)

WMO World Data Centre for Greenhouse Gases
c/o Japan Meteorological Agency
1-3-4, Otemachi, Chiyoda-ku
Tokyo 100-8122, Japan
Tel: +81-3-3287-3439
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