Two high-speed, portable GC systems designed for the measurement of non-methane hydrocarbons and PAN: results from the Jungfraujoch High Altitude Observatory.

Near real-time measurements of light non-methane hydrocarbons (NMHCs) and peroxyacetyl nitrate (PAN) have been performed in the free troposphere using two fast gas chromatography (GC) instruments designed for use on aircraft. A GC-helium ionisation detector (HID) system measured 15 C(2)-C(5) hydrocarbons with 5 min time resolution and a dual channel GC-Electron Capture Detector (ECD) measured PAN with 90 s resolution. Both instruments had low parts per trillion by volume (pptV) detection limits and ran continuously at the remote Jungfraujoch (JFJ) research station in the Swiss Alps (46.55[degree]N, 7.98[degree]E), 3580 m above mean sea level (AMSL), during February/March 2003. Carbon monoxide, ozone, nitrogen oxide and nitrogen dioxide and all odd nitrogen species (NO(y)) were also measured continuously. Hydrocarbons and CO were strongly correlated in all air-masses whilst PAN exhibited both positive and negative correlations with respect to O(3), dependent on age and origin of the air-mass sampled. PAN was found to contribute [similar]20% to the NO(y) sampled on average. The experiment, as well as providing interesting datasets from this remote location, also demonstrated that when optimised, GC techniques have the potential to measure at a time resolution significantly greater than is traditionally considered, with high sensitivity and low uncertainty.

[1]  B. Buchmann,et al.  Variability of trace gases at the high-Alpine site Jungfraujoch caused by meteorological transport processes , 2000 .

[2]  John Methven,et al.  Rapid uplift of nonmethane hydrocarbons in a cold front over central Europe , 2003 .

[3]  Y. Yokouchi,et al.  Measurements of C2‐C6 hydrocarbons during the Polar Sunrise1992 Experiment: Evidence for Cl atom and Br atom chemistry , 1994 .

[4]  N. Blake,et al.  The seasonal variation of nonmethane hydrocarbons in the free troposphere over the North Atlantic Ocean: Possible evidence for extensive reaction of hydrocarbons with the nitrate radical , 1993 .

[5]  J. Gaffney,et al.  Capillary gas chromatographic analysis of nitrogen dioxide and pans with luminol chemiluminescent detection. , 1998 .

[6]  A. Lewis,et al.  The Use of the Helium Ionization Detector for Gas Chromatographic Monitoring of Trace Atmospheric Components , 1998 .

[7]  K. Clemitshaw,et al.  Estimates of atmospheric hydroxyl radical concentrations from the observed decay of many reactive hydrocarbons in well‐defined urban plumes , 1993 .

[8]  J. Lelieveld,et al.  High Acetone Concentrations throughout the 0–12 km Altitude Range over the Tropical Rainforest in Surinam , 2001 .

[9]  Donald J. Wuebbles,et al.  Radiative Forcing of Climate Changes in the Vertical Distribution of Ozone , 1990 .

[10]  F. Slemr,et al.  Airborne peroxyacetyl nitrate (PAN) and peroxypropionyl nitrate (PPN) measurements during tract 1992 , 1998 .

[11]  Werner Lindinger,et al.  Proton-transfer-reaction mass spectrometry (PTR–MS): on-line monitoring of volatile organic compounds at pptv levels , 1998 .

[12]  E. P. Hunter,et al.  Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update , 1998 .

[13]  C. Warneke,et al.  Measurements of benzene and toluene in ambient air using proton-transfer-reaction mass spectrometry: calibration, humidity dependence, and field intercomparison , 2001 .

[14]  P. Crutzen,et al.  Acetone and PAN in the upper troposphere: impact on ozone production from aircraft emissions , 2000 .

[15]  A. Wisthaler,et al.  A method for real‐time detection of PAN, PPN and MPAN in ambient air , 2000 .

[16]  J. Lelieveld,et al.  High spatial and temporal resolution measurements of primary organics and their oxidation products over the tropical forests of Surinam. , 2000 .

[17]  H. Wanner,et al.  A climatology of regional background ozone at different elevations in Switzerland (1992–1998) , 2000 .

[18]  P. Monks,et al.  Oxidized nitrogen and ozone production efficiencies in the springtime free troposphere over the Alps , 2000 .

[19]  R. Koppmann,et al.  Measurements of Carbon Monoxide and Nonmethane Hydrocarbons During POPCORN , 1998 .

[20]  Stuart A. McKeen,et al.  Impact of natural hydrocarbons on hydroxyl and peroxy radicals at a remote site , 1987 .

[21]  B. Jobson,et al.  Airborne measurements of isoprene, CO, and anthropogenic hydrocarbons and their implications , 2000 .

[22]  U. Baltensperger,et al.  Summertime NO y speciation at the Jungfraujoch, 3580 m above sea level, Switzerland , 2000 .

[23]  André S. H. Prévôt,et al.  Airborne NMHC measurements under various pollution conditions , 2000 .