Global tropospheric distribution and calibration scale of HCFC-22

Journal Article · Mon Feb 01 00:00:00 EST 1993 · Chemical Processing (Chicago); (United States)

DOI:https://doi.org/10.1029/93GL00753· OSTI ID:6533062

Montzka, S A; Myers, R C; Butler, J H; Elkins, J W ^[1]; Cummings, S O

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1. NOAA, Boulder, CO (United States)

Measurements of atmospheric chlorodifluoromethane (HCFC-22), based upon a new calibration scale developed in this laboratory, suggest a global tropospheric mean that is [approx]28% lower than determined previously from surface-based measurements. A global mean of 101.8 ([+-]1.2, 1 s.d.) ppt and interhemispheric difference of 13 ([+-]1) ppt were determined for HCFC-22 in 1992 from air collected in flasks from seven remote sites located between 82[degree]N and 90[degree]S. These results are consistent with mixing ratios predicted from recent emission estimates and a lifetime for HCFC-22 of 13.6 (+1.9,-1.5) yr. Based upon the analysis of flasks and archived air samples from mid-1987 through 1992, a mean growth rate for HCFC-22 of 7.3 ([+-]0.3)% yr[sup [minus]1] was estimated for this period. 26 refs., 3 figs.

• OSTI ID: 6533062
• Journal Information: Chemical Processing (Chicago); (United States), Vol. 56:2; ISSN 0009-2630
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CHLOROFLUOROCARBONS
ECOLOGICAL CONCENTRATION
GLOBAL ASPECTS
MEASURING INSTRUMENTS
CALIBRATION
AIR
CONTAMINATION
DISTRIBUTION
HYDROXYL RADICALS
LIFETIME
MEASURING METHODS
OZONE
TROPOSPHERE
EARTH ATMOSPHERE
FLUIDS
GASES
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RADICALS
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)