Observations of major stratospheric chlorine species. Final scientific report
A cryogenic whole air sampler (Tri-Sampler) and a Direct Flow Sampler (DFS), a motor-driven filter sampler, are used simultaneously on a balloon platform with the goal of sampling all significant stratospheric chlorine compounds to permit determination of total chlorine content in the lower stratosphere, Gas chromatographic techniques are applied to the retrieved whole air samples, to determine volume mixing ratios of CF2Cl2, CFCl3, CH3Cl, CH3CCl3, and CCl4. Specially treated filters are used with the DFS to capture all acidic and participate chlorine compounds. The filter samples are analyzed using wet chemistry and neutron-activation analysis techniques. Three balloon flights were conducted during 1981-1982 and simultaneous samplings were obtained at various altitudes form 15 to 30 km. Mixing-ratio lapse rates for the species analyzed by gas chromatography are consistent with those species being of tropospheric origin. Also, stratospheric abundances of CFCl3 and CF2Cl2 exhibited minimal changes over several years, although the tropospheric abundances of these species are known to increase at about 10 percent per year in the northern hemisphere.
- Research Organization:
- Air Force Geophysics Lab., Hanscom AFB, MA (USA)
- OSTI ID:
- 6813753
- Report Number(s):
- AD-A-138646/5; AFGL-TR-83-0284; AFGL-ERP-860
- Country of Publication:
- United States
- Language:
- English
Similar Records
Total chlorine content in the lower stratosphere
Estimates of total organic and inorganic chlorine in the lower stratosphere from in situ and flask measurements during AASE 2
Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR
AIRSHIPS
ALKYL RADICALS
ATMOSPHERIC CHEMISTRY
BALLOONS
CARBON COMPOUNDS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
CHLORINE
CHROMATOGRAPHY
CRYOGENICS
EARTH ATMOSPHERE
ELEMENTS
EQUIPMENT
FILTERS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GAS CHROMATOGRAPHY
GASES
HALIDES
HALOGEN COMPOUNDS
HALOGENS
METHYL RADICALS
MIXING
NONMETALS
RADICALS
SAMPLERS
SAMPLING
SEPARATION PROCESSES
STRATOSPHERE
VOLUME