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WDCGG Data Submission and Dissemination Guide (PDF 1.2Mbyte)

WDCGG leaflet (PDF 2.7MByte, July 2008)

Tutuila (Cape Matatula) - AGAGE
Parameter Inventory Parameter Metadata Station Contributor
C2Cl4 *
continuous		 C2HCl3 *
continuous		 CBrClF2 *
continuous		 CBrF3 *
continuous		 CCl4 *
continuous		 CFCs *
continuous		 CH2Cl2 *
continuous		 CH3Br *
continuous		 CH3CCl3 *
continuous		 CH3Cl *
continuous		 CH4 * *
continuous
CHCl3 *
continuous		 HCFCs *
continuous		 HFCs *
continuous		 N2O ** *
continuous		 SF6 *
continuous		 SO2F2 *
continuous
Observation Processing/Calibration Contact Person Reference Data/Quick Plot
Category Air sampling observation
Sampling Type continuous
Sampling Height/Depth
Sampling and Analysis Frequency
Sampling Environment
Measurement Method Gas Chromatography (MS)
Current status and history of Instruments Automated gas chromatograph-mass spectrometer with an adsorption-desorption system (ADS GC-MS)
Mace Head, Ireland (started in October 1994)
Cape Grim, Tasmania (started in January 1998)

MEDUSA Gas Chromatography with Mass Spectrometry (Medusa GC-MS)
Medusa GC-MS instrument has been deployed (from November 2003 to June 2006) at all (five) AGAGE stations and at the Scripps Institution of Oceanography (SIO) calibration laboratory.
Description of Instruments http://agage.eas.gatech.edu/instruments-overview.htm
http://agage.eas.gatech.edu/instruments-gcms-medusa.htm
Time Zone UTC
Data Period 2006-05-01 - 2009-03-31
Data Type event, monthly
Parameter detail
Other Descriptions for Sampling and Analyses http://agage.eas.gatech.edu/index.htm
Scientific Aim Mission

The scientific objectives of the ALE/GAGE/AGAGE programs are several in number and of considerable importance in furthering our understanding of a number of important global chemical and climatic phenomena. They are:

1. To optimally determine from observations, the rate of emission and/or chemical destruction (i.e. lifetime) of the anthropogenic chemicals (e.g. chlorocarbons, chlorofluorocarbons (CFCs), and bromocarbons) that contribute most of the reactive chlorine and bromine released into the stratosphere and/or are strong infrared absorbers.

2. To accurately document the global distributions and temporal behavior of the biogenic/anthropogenic gases N2O, CH4, CO, H2, CH3Cl, CH3Br, CH2Cl2, and CHCl3.

3. To optimally determine the average concentrations and trends of OH radicals in the troposphere by determining the rates of destruction of atmospheric CH3CCl3 and other hydrohalocarbons from continuous measurements of their concentrations together with industrial estimates of their emissions.

4. To determine optimally, using high frequency trace gas data (and theoretical estimates of their rates of destruction), the magnitudes and distributions by region of the surface sources of these gases.

5. To provide an accurate data base on the rates of accumulation of trace gases over the globe which can be used to test the synoptic-, regional- and global-scale circulation predicted by three dimensional models and/or to determine characteristics of the sources of these gases near the stations.

6. To provide routine measurements of CH4, CO and H2, and estimates of OH levels that can be used to test primary oxidation pathways in the atmosphere.
Supporting Contributor(s)
Last update 2009-11-19
Situation ongoing

Category Parameter Country/Territory Contributor
  Updated in
the last 365 days

This site is maintained by the Japan Meteorological Agency
in cooperation with the World Meteorological Organization
(Created : 2001/07/02    Modified : 2010/09/02)
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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