Latest update: (January 2012) 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). (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 26 compounds measured by Medusa GC-MS instruments available for public archive. Available compounds are following, CFC-113 HCFC-22, HCFC-141b, HCFC-142b HFC-125, HFC-134a, HFC-152a, HFC-365mfc, HFC-23 Halon-1211, Halon-1301 CH3Cl, CH2Cl2, CHCl3, CH3Br CH3CCl3, CHClCCl2, CCl2CCl2 SF6, SO2F2 PFC-14, PFC-116, PFC-218 HFC-227ea, HFC-236fa, HFC-245fa You can find the above data in "gcms_medusa" directory. (4) In general data through Sep. 2010 are included in this update You can download "Agage_gcmd_gcms.data_2011_07.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) In this update measurements from Jungfraujoch (Switzerland) and Zeppelin (Ny-ALesund) are included (data are saved in sub-directory "gc-ms" and "gc-ms-medusa) (8) If you use AGAGE data in your research and publication please quote related publications as shown following, (9) For more information about AGAGE data and instruments, please see AGAGE web site (http://agage.eas.gatech.edu) AGAGE related publications, ============================ (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, 2000. (ii) Species from GCMD measurements CFC-11, CFC-12 -------------- 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 CH3CCl3: ---------- (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. CCl4 ------- 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. N2O ----- 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. CFC-113 --------- 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. CH4: ------ 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. CHCl3: -------- 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. CO: ----- 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, 2001. H2: ----- 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, 12105-12121, 2000. (iii) Species from GCMS measurements CH3Br, CH3Cl -------------- 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. CH3I ------ 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, 1998.