Airborne gas chromatograph for in situ measurements of long-lived species in the upper troposphere and lower stratosphere

Details Airborne gas chromatograph for in situ measurements of long-lived species in the upper troposphere and lower stratosphere Airborne gas chromatograph for in situ measurements of long-lived species in the upper troposphere and lower stratosphere

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996georl..23..347e&link_type=abstract

Geophysical Research Letters, Volume 23, Issue 4, p. 347-350

Physics

109

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

Scientific paper

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.

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