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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