Index of /ftp/ale_gage_Agage/AGAGE
Latest update: (Jun. 2015)
For all released compounds and the latest scales used by AGAGE network,
please see 'AGAGE_scale_2015_v1.pdf" file.
There are three subdirectories, "gc-md" ,"gc-ms" and 'gc-ms-medusa",
in current directory.
(1) chemical species measured by AGAGE GC-ECD/FID/MRD system are
saved in "gc-md" (i.e CFC-11, CFC-12, CH3CCl3, CCl4, N2O,
CFC-113, CH4, CHCl3, CO, and H2).
Both Mace Head and Cape Grim H2 data have been converted to a new
(MPI2009) calibration scale. Please see "H2calibration_2013.v01.doc"
in "gc-md" directory for further information
(2) chemical compounds measured by AGAGE GC-MS (ADS) system (i.e
HFC-134a, HCFC-22, HCFC-141b, HCFC-142b, CH3Cl, CH3Br,
Halon-1211, Halon-1301, HFC-152a, CH2Cl2, CHClCCl3, and
CCl2CCl2) are saved in "gc-ms" area.
(3) The original AGAGE GC-MS (ADS) instruments at Mace Head and
Cape Grim were retired in December 2004. They were replaced
by new generation of Medusa GCMS system, which has been
installed at Mace Head (November 2003), Cape Grim (January 2004)
Trinidad Head (April 2005), Barbados (May 2005), and Samoa (May 2006).
Data from Medus GC-MS instruments are saved in "gc-ms-medusa" area.
Currently there are 36 compounds measured by Medusa GC-MS instruments
available for public archive. Available compounds are following,
CFC-11, CFC-12, CFC-113, CFC-114, CFC-115
HCFC-22, HCFC-141b, HCFC-142b
HFC-125, HFC-134a, HFC-152a, HFC-365mfc, HFC-23, HFC-4310mee
CH3Cl, CH2Cl2, CHCl3, CH3Br
CH3CCl3, CHClCCl2, CCl2CCl2 CCl4
SF6, SO2F2, NF3
PFC-14, PFC-116, PFC-218
HFC-32, HFC-143a, HFC-227ea HFC-236fa HFC-245fa
You can find the above data in "gcms_medusa" directory.
(4) In general data through Sep. 2014 are included in this update
You can download "Agage_gcmd_gcms.data_2015_06.tar.gz" file
for all data in current and sub-directory (gc-md, gc-ms, gc-ms-medusa).
(5) Please be aware that Medusa TCE (CHClCCl2), and PCE (CCl2CCl2) data
have not been applied "blank correction". Those data are preliminary
and will be updated later (after blank correction is applied).
(6) It was found that there are offsets in Mace Head CHCl3 data between
GC-MD and GC-MS Medusa measurements. The reason is unknown and it's
under investigation by instrument team.
(7) For more information about AGAGE data and instruments, please
see AGAGE web site (http://agage.mit.edu)
AGAGE related publications (for recent publications, please see
(i) General reference for all species: instrumentation,
calibration and measurements
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. Midgley, and A. McCulloch, A History of
Chemically and Radiatively Important Gases in Air deduced
from ALE/GAGE/AGAGE, J. Geophys. Res., 105, 17,751-17,792,
(ii) Species from GCMD measurements
Cunnold, D.M., R. F. Weiss, R. G. Prinn, D. E. Hartley, P.
G. Simmonds, P.J. Fraser, B. R. Miller, F. N. Alyea, and L.
Porter, GAGE/AGAGE measurements indicating reduction in
global emissions of CCl3F and CCl2F2 in 1992-1994, J.
Geophys. Res., 102, 1259-1269, 1997
(a) all stations:
Prinn, R.G., J. Huang, R.F. Weiss, D.M. Cunnold, P.J.
Fraser, P.G. Simmonds, A. McCulloch, C. Harth, S. Reimann, P.
Salameh, S. O'Doherty, R.H.J. Wang, L. Porter, B.R. Miller,
and P.B. Krummel, Evidence for variability of atmospheric
hydroxyl radicals over the past quarter century, Geophys.
Res. Lett., 32, L07809, 10.1029/2004GL022228, 2005.
Prinn, R.G., J. Huang, R.F. Weiss, D.M. Cunnold, P.J.
Fraser, P.G. Simmonds, A. McCulloch, C.Harth, P. Salameh, S.
O'Doherty, R.H.J. Wang, L. Porter, and B.R. Miller, Evidence
for significant variations of atmospheric hydroxyl radicals
in the last two decades, Science, 292. 1882-1888, 2001
(b) European stations:
Reimann, S., J.M. Alister, P.G. Simmonds, D.M. Cunnold,
R.H.J. Wang, J. Li, A. McCulloch, R.G. Prinn, J. Huang, R.F.
Weiss, P.J. Fraser, S. O'Doherty, B.B. Greally, K. Stemmler,
M. Hill and D. Folini, Low European methyl chloroform
emissions inferred from long-term atmospheric measurements,
Nature, 433, 506-509.
Simmonds, P.G., D. M. Cunnold, R.F. Weiss, R.G. Prinn, P.J.
Fraser, A. McCulloch, F.N. Alyea, and S. O'Doherty, Global
trends and emissions of CCl4 from in-situ background
observations from July 1978 to June 1996, J. Geophys. Res.,
103, 16017-16027, 1998.
Prinn, R.G., D.M. Cunnold, R. Rasmussen, P.G. Simmonds, F.N.
Alyea, A. Crawford, P.J. Fraser, and R. Rosen, Atmospheric
emissions and trends of nitrous oxide deduced from ten years
of ALE-GAGE data, J. Geophys. Res., 95, 18369-18385, 1990.
Fraser, P., D. Cunnold, F. Alyea, R. Weiss, R. Prinn, P.
Simmonds, B. Miller, and R. Langenfelds, Lifetime and
emission estimates of 1,1,2-trichlorotrifluorethane (CFC-
113) from daily global background observations June 1982-
June 1994., J. Geophys. Res., 101, 12,585-12,599, 1996.
Cunnold, D.M., L.P. Steele, P.J. Fraser, P.G. Simmonds, R.G.
Prinn, R.F. Weiss, L.W. Porter, R.L. Langenfelds, H.J. Wang,
L. Emmons, X.X. Tie, and E.J. Dlugokencky, In situ
measurements of atmospheric methane at GAGE/AGAGE sites
during 1985-2000 and resulting source inferences. J.
Geophys. Res., 107, D14, doi: 10.1029/2001JD001226, 2002.
O'Doherty, S., D. Cunnold, G.A. Sturrock, D. Ryall, R.G.
Derwent, H.J. Wang, P. Simmonds, P.J. Fraser, R.F. Weiss, P.
Salameh, B.R. Miller, and R.G. Prinn, In-situ chloroform
measurements at AGAGE atmospheric research stations from
1994-1998, J. Geophys. Res., 106, 20,429-20,444, 2001.
Derwent, R.G., D.B. Ryall, S.G. Jennings, T.G. Spain, and
P.G. Simmonds, Black carbon aerosol and carbon monoxide in
European regionally-polluted air masses at Mace Head,
Ireland during 1995-1998, Atmos. Environ., 35, 6371-6378,
Simmonds, P.G., R.G. Derwent, S. O'Doherty, D.B. Ryall, L.P.
Steele, R.L. Langenfelds, P. Salameh, H.J. Wang, C.H.
Dimmer, L.E. Hudson, Continuous high-frequency observations
of hydrogen at the Mace Head baseline atmospheric monitoring
station over the 1994-1998 period, J. Geophys. Res., 105,
(iii) Species from GCMS measurements
Simmonds, P.G., S. O'Doherty, R.G. Derwent, A.J. Manning,
D.B. Ryall, P. Fraser, L. Porter, P. Krummel, R. Weiss, B.
Miller, P. Salameh, D. Cunnold, R. Wang, and R. Prinn, AGAGE
observations of methyl bromide and methyl chloride at the
Mace Head, Ireland and Cape Grim, Tasmania, 1998-2001, J.
Atmos. Chem., 47, 243-269, 2004.
Cox. M.L. G.A. Sturrock, P.J. Fraser, S.T. Siems, P.B.
Krummel, and S. O'Doherty, Regional sources of methyl
chloride, chloroform and dichloromethane identified from
AGAGE observations at Cape Grim, Tasmania, 1998-2000., J.
Atmos. Chem., 45, 79-99, 2003.
Cohan, D.S., G.A. Sturrock, A.P. Biazar, and P.J. Fraser,
Atmospheric methyl iodide at Cape Grim, Tasmania from AGAGE
observations, J. Atmos. Chem., 44, 131-150, 2003.
HFC-134a, HCFC-141b, -142b, -22
O'Doherty, S., D.M. Cunnold, P.G. Simmonds, G. Sturrock, J.
Huang, R.G. Prinn, L.W. Porter, P.J. Fraser, P.B. Krummel,
B.R. Miller, P. Salameh, R.F. Weiss, R.H.J. Wang, A.
McCulloch, S. Montzka, A. Manning, D. Ryall, and R.G.
Derwent, Rapid growth of hydrofluorocarbon 134a and
hydrochlorofluorocarbons 141b, 142b, and 22 from Advanced
Global Atmospheric Gases Experiment (AGAGE) observations at
Cape Grim, Tasmania, and Mace Head, Ireland, J. Geophys.
Res., 109, D06310, doi: 10.1029/2003JD004277, 2004.
Miller, B.R., J. Huang, R.F. Weiss, R.G. Prinn and P.J.
Fraser, Atmospheric trend and lifetime of
chlorodifluoromethane (HCFC-22) and the global tropospheric
OH concentrations, J. Geophys. Res., 103, 13,237-13,248,