image image image image
 

The ALE / GAGE / AGAGE Network (DB1001)

DOI: 10.3334/CDIAC/atg.db1001

Links to Additional Sources

Investigators

R.G. Prinn, R.F. Weiss, P.J. Fraser, P.G. Simmonds, S. O'Doherty, P. Salameh, L. Porter, P. Krummel, R.H.J. Wang, B. Miller, C. Harth, B. Greally, F.A. Van Woy, L.P. Steele, J. Müehle, G. Sturrock, F.N. Alyea, J. Huang, and D.E. Hartley

Description

In the ALE/GAGE/AGAGE global network program, continuous high frequency gas chromatographic measurements of four biogenic/anthropogenic gases (methane, CH4; nitrous oxide, N2O; hydrogen, H; and carbon monoxide, CO) and several anthropogenic gases that contribute to stratospheric ozone destruction and/or to the greenhouse effect have been carried out at five globally distributed sites for several years. Recently additional stations at Jungfraujoch, Switzerland and Zeppelin Mountain, Norway have been added to the network. Data are currently available for all measured species listed in the table below. Units are dry air mole fractions in parts per 1012 (picomoles/mole) for all halocarbons and SF6, and parts per 109 (nanomoles/mole) for nitrous oxide, methane, carbon monoxide and hydrogen.

The program, which began in 1978, is divided into three parts associated with three changes in instrumentation: the Atmospheric Lifetime Experiment (ALE), which used Hewlett Packard HP5840 gas chromatographs; the Global Atmospheric Gases Experiment (GAGE), which used HP5880 gas chromatographs; and the present Advanced GAGE (AGAGE). AGAGE uses two types of instruments: a gas chromatograph with multiple detectors (GC-MD), and a gas chromatograph with mass spectrometric analysis (GC-MS). The GC-MD is a new fully automated system produced at the Scripps Institution of Oceanography and includes a custom-designed sample module plus HP5890 and Carle AGC-211 gas chromatographic components. The original GC-MS was a fully automated system produced at the University of Bristol and comprised of an adsorption-desorption preconcentration module and an HP5973 gas chromatographic and mass spectrometric module. Beginning in January 2004, an improved cryogenic preconcentration system (Medusa) replaced the absorption-desorption module in the GC-MS systems at Mace Head and Cape Grim; this provided improved capability to measure a broader range of volatile perfluorocarbons with high global warming potentials. The Medusa system is now used at all current AGAGE stations. Further details on this upgrade may be found at the AGAGE home page.

http://agage.eas.gatech.edu/instruments-gcms-medusa.htm

Currently Active Stations Represented in This Data Base

image
Ny-Ålesund, Norway
image
American Samoa
image
Mace Head, Ireland
image
Ragged Point, Barbados

The current station locations are Cape Grim, Tasmania (41° S, 145° E), Cape Matatula, American Samoa (14° S, 171° E), Ragged Point, Barbados (13° N, 59° W), Mace Head, Ireland (53° N, 10° W), Trinidad Head, California (41° N, 124° W), Jungfraujoch, Switzerland (47° N, 8° E), and Zeppelin Mountain, Norway (79° N, 12° E). Stations also previously existed at Cape Meares, Oregon (45° N, 124° W) and Adrigole, Ireland (52° N, 10° W). The Mace Head station came on line in January 1987 as a replacement for the Adrigole station which ceased operations at the end of December 1983; the Trinidad Head station began operations during AGAGE in October 1995, as an essential replacement for the Cape Meares station from which GAGE data were not available after June 1989.

Data from all three experiments are posted. AGAGE data through March 2013 are now available for all existing sites. Individual measurements (generally made 4 times daily at each site for ALE, 12 times daily at each site for GAGE, and more than 30 times daily at each site for AGAGE) and monthly summary averages are provided for each site. All ALE and GAGE data have been recalculated according to the current AGAGE calibration standards, thus creating a unified ALE/GAGE/AGAGE data set. All ALE/GAGE/AGAGE data previously reported based on the Scripps Institution of Oceanography (SIO)-1998 calibration scale are now recalibrated to the SIO-2005 scale; more information about instrumentation and calibration for ALE, GAGE and AGAGE is given by Prinn et al. (2000). Please see the "readme" files and (for gc-md) the "COcalibration.doc" and "H2calibration.doc" files for information on calibration of individual species.

More extensive information about AGAGE may found from the AGAGE home page.

Reference

  • Prinn, R.G., R.F. Weiss, P.J. Fraser, P.G. Simmonds, D.M. Cunnold, F.N. Alyea, S. O'Doherty, P. Salameh, B.R. Miller, J. Huang, R.H.J. Wang, D.E. Hartley, C. Harth, L.P. Steele, G. Sturrock, P.M. Midgely, and A. McCulloch. 2000. A history of chemically and radiatively important gases in air deduced from ALE/GAGE/AGAGE. Journal of Geophysical Research 105: 17751-17792.
ALE/GAGE/AGAGE Data Available (January 2014)
Measured Species Zeppelin Mtn. Station,
Norway
(79° N, 12° E)
Mace Head,
Ireland
(53° N, 10° W)
Adrigole,
Ireland
(52° N, 10° W)1
Jungfraujoch,
Switzerland
(47° N, 8° E)
Cape Meares,
Oregon, USA
(45° N, 124° W)2
Trinidad Head,
California
USA
(41° N, 124° W)
Ragged Point,
Barbados
(13° N, 59° W)
Cape Matatula,
American Samoa
(14° S, 171° W)3
Cape Grim,
Tasmania
(41° S, 145° E)
Methane (CH4) Not
reported
Jan 87
Mar 13
Not
measured
Not
reported
Nov 85
June 89
Oct 95
Mar 13
Nov 85
Mar 13
Feb 87
Mar 13
May 86
Mar 13
Nitrous oxide (N2O) Not
reported
Jan 87
Mar 13
July 78
Dec 83
Not
reported
Mar 80
June 89
Oct 95
Mar 13
July 78
Mar 13
Nov 78
Mar 13
July 78
Mar 13
CFC-11 (CFCl3) Not
reported
Jan 87
Mar 13
July 78
Dec 83
Not
reported
Dec 79
June 89
Oct 95
Mar 13
July 78
Mar 13
July 78
Mar 13
Jul 78
Mar 13
CFC-12 (CF2Cl2) Not
reported
Jan 87
Mar 13
July 78
Dec 83
Not
reported
Nov 80
June 89
Oct 95
Mar 13
July 78
Mar 13
July 78
Mar 13
July 78
Mar 13
CFC-113 (CF2ClCFCl2) Sep 10
Jun 12
Jan 87
Mar 13
Not
measured
Apr 08
Mar 13
Apr 84
June 89
Dec 95
Mar 13
Oct 85
Mar 13
Oct 85
Mar 13
June 82
Mar 13
Methyl chloroform (CH3CCl3) Aug 01
Mar 13
Jan 87
Mar 13
July 78
Dec 83
Feb 00
Mar 13
Dec 79
June 89
Oct 95
Mar 13
July 78
Mar 13
July 78
Mar 13
July 78
Mar 13
Carbon tetrachloride (CCl4) Not
reported
Jan 87
Mar 13
Dec 79
Dec 83
Not
reported
Dec 79
June 89
Oct 95
Mar 13
July 78
Mar 13
July 78
Mar 13
July 78
Mar 13
Chloroform (CHCl3) Sep 10
Mar 13
Mar 94
Mar 13
Not
measured
Apr 00
Mar 13
Not
measured
Oct 95
Mar 13
June 96
Mar 13
Aug 96
Mar 13
Mar 94
Mar 13
Carbon monoxide (CO) Not
reported
Mar 94
Mar 13
Not
measured
Not
reported
Not
measured
Not
measured
Not
measured
Not
measured
Aug 93
Dec 994
Hydrogen (H2) Not
reported
Mar 94
Mar 13
Not
measured
Not
reported
Not
measured
Not
measured
Not
measured
Not
measured
Aug 93
Mar 13
Sulfur hexafluoride (SF6) Sep 10
Mar 13
Nov 03
Mar 13
Not
measured
Apr 08
Sep 12
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Jul 01
Mar 13
HFC-134a (CF3CH2F) Jan 01
Mar 13
Oct 94
Mar 13
Not
measured
Jan 00
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Feb 98
Mar 13
HFC-152a (CF3CHF2) Jan 01
Mar 13
Oct 94
Mar 13
Not
measured
Jan 00
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Feb 98
Mar 13
HCFC-141b (CH3CFCl2) Jan 01
Mar 13
Nov 94
Mar 13
Not
measured
Jan 00
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Mar 98
Mar 13
HCFC-142b (CH3CF2Cl) Jan 01
Mar 13
Oct 94
Mar 13
Not
measured
Aug 12
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Mar 98
Mar 13
HCFC-22 (CHClF2) Jan 01
Mar 13
Jan 99
Mar 13
Not
measured
Aug 12
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Mar 98
Mar 13
Methyl chloride (CH3Cl) Jan 01
Mar 13
Feb 98
Mar 13
Not
measured
Jan 00
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Jan 98
Mar 13
Methyl bromide (CH3Br) Jun 01
Mar 13
Feb 98
Mar 13
Not
measured
Jan 00
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Mar 98
Mar 13
Halon 1211 (CF2BrCl) Jan 01
Mar 13
Oct 94
Mar 13
Not
measured
Jan 00
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Mar 98
Mar 13
Halon 1301 (CF3Br) Jan 01
Mar 13
Feb 98
Mar 13
Not
measured
Jul 00
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Mar 98
Mar 13
HFC-365mfc (CF3CH2CF2CH3) Dec 06
Mar 13
Mar 03
Mar 13
Not
measured
Dec 02
Mar 13
Not
measured
May 05
Mar 13
May 06
Mar 13
May 06
Mar 13
Mar 04
Mar 13
Dichloromethane (CH2Cl2) Jan 01
Mar 13
Apr 95
Mar 13
Not
measured
Jan 00
Sep 12
Not
measured
Mar 05
Mar 13
May 05
Sep 12
May 06
Mar 13
Feb 98
Aug 11
Trichloroethylene (C2HCl3) Not
reported
Sep 99
Dec 04
Not
measured
Jan 00
Apr 08
Not
measured
Not
measured
Not
measured
Not
measured
Not
measured
Perchloroethylene (C2Cl4) Sep 10
Mar 13
Sep 00
Mar 13
Not
measured
Jan 00
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Jul 00
Mar 13
Sulfuryl fluoride (SO2F2) Sep 10
Mar 13
Nov 04
Mar 13
Not
measured
Apr 08
Mar 13
Not
measured
Mar 05
Mar 13
Jul 05
Mar 13
May 06
Mar 13
Nov 04
Mar 13
HFC-125 (CHF2CF3) Jan 01
Mar 13
Feb 98
Mar 13
Not
measured
Jan 00
Mar 13
Not
measured
Mar 08
Sep 12
May 05
Mar 13
May 06
Mar 13
Feb 98
Mar 13
HFC-23 (CHF3) Sep 10
Jun 12
Oct 07
Mar 13
Not
measured
Apr 08
Mar 13
Not
measured
Sep 07
Mar 13
Aug 07
Mar 13
Oct 07
Mar 13
Nov 07
Mar 13
PFC-116 (C2F6) Not
reported
Nov 03
Mar 13
Not
measured
Apr 08
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
Nov 06
Mar 13
Apr 04
Mar 13
PFC-218 (C3F8) Sep 10
Mar 13
Nov 03
Mar 13
Not
measured
Apr 08
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Jan 04
Mar 13
PFC-14 (CF4) Not
reported
May 06
Mar 13
Not
measured
Jan 10
Mar 12
Not
measured
Apr 06
Mar 13
Jun 06
Mar 13
Jun 06
Mar 13
May 06
Mar 13
HFC-227ea (CF3CHFCF3) Sep 10
Mar 13
Oct 06
Mar 13
Not
measured
Aug 04
Mar 13
Not
measured
Oct 07
Mar 13
Nov 07
Mar 13
Oct 07
Mar 13
Jun 06
Mar 13
HFC-245fa (CHF2CH2CF3) Sep 10
Mar 13
Nov 06
Mar 13
Not
measured
Oct 04
Mar 13
Not
measured
Dec 07
Mar 13
Dec 07
Mar 13
Nov 07
Mar 13
Jun 06
Mar 13
HFC-236fa (CF3CH2CF3) Sep 10
Mar 13
Oct 06
Mar 13
Not
measured
May 08
Mar 13
Not
measured
Oct 07
Mar 13
Nov 07
Mar 13
Oct 07
Mar 13
Sep 06
Mar 13
CFC-115 (CCLF2CF3) Sep 10
Mar 13
Nov 03
Mar 13
Not
measured
Apr 08
Mar 13
Not
measured
Mar 05
Mar 13
May 05
Mar 13
May 06
Mar 13
Jan 04
Mar 13

1No longer used for sampling. Replaced by the station at Mace Head, Ireland (53° N, 10° W).
2No longer used for sampling. Replaced by the station at Trinidad Head, California (41° N, 124° W).
3A tsunami on September 30, 2009 caused a power shutdown that prevented measurements of many gases at this station from October 2009 through February 2010.
4Carbon monoxide (CO) data for Cape Grim, Tasmania, after December 1999 are also temporarily removed in this update due to a non-linear problem. It will be added after an appropriate correction is applied.

Updated January 2014.