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Elkins, J.W., Fahey, D.W., Gilligan, J.M., Dutton, G.S., Baring, T.J., Volk, C.M., Dunn, R.E., Myers, R.C., Montzka, S.A., Wamsley, P.R., Hayden, A.H., Butler, J.H., Thompson, T.M., Swanson, T.H., Dlugokencky, E.J., Novelli, P.C., Hurst, D.F., Lobert, J.M., Ciciora, S.J., McLaughlin, R.J., Thompson, T.L., Winkler, R.H., Fraser, P.J., Steele, L.P. and Lucarelli, M.P. (1996). Airborne gas chromatograph for in situ measurements of long-lived species in the upper troposphere and lower stratosphere. Geophysical Research Letters 23: doi: 10.1029/96GL00244. issn: 0094-8276. |
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A new instrument, the Airborne Chromatograph for Atmospheric Trace Species IV (ACATS-IV), for measuring long-lived species in the upper troposphere and lower stratosphere is described. Using an advanced approach to gas chromatography and electron capture detection, the instrument can detect low levels of CFC-11 (CCl3F), CFC-12 (CCl2F2), CFC-113 (CCl2F-CClF2), methyl chloroform (CH3CCl3), carbon tetrachloride (CCl4), nitrous oxide (N2O), sulfur hexafluoride (SF6), Halon-1211 (CBrClF2), hydrogen (H2), and methane (CH4) acquired in ambient samples every 180 or 360 s. The instrument operates fully-automated onboard the NASA ER-2 high-altitude aircraft on flights lasting up to 8 hours or more in duration. Recent measurements include 24 successful flights covering a broad latitude range (70 ¿S--61 ¿N) during the Airborne Southern Hemisphere Ozone Experiment/Measurements for Assessing the Effects of Stratospheric Aircraft (ASHOE/MAESA) campaign in 1994. ¿ American Geophysical Union 1996 |
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Keywords
Atmospheric Composition and Structure, Middle atmosphere—composition and chemistry, Atmospheric Composition and Structure, Middle atmosphere—constituent transport and chemistry, Atmospheric Composition and Structure, Instruments and techniques, Atmospheric Composition and Structure, Troposphere—composition and chemistry |
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