In situ observations of ClO in the Antarctic: ER-2 aircraft results from 54 degree S to 72 degree S latitude
- Harvard Univ., Cambridge, MA (United States)
- NASA Ames Research Center, Moffett Field, CA (United States)
Results from a series of 12 ER-2 aircraft flights into the Antarctic polar vortex are summarized. These in situ data define the spatial and temporal distribution of ClO as the aircraft flew at an altitude of {approximately} 18 km from Punta Arenas (54{degree}S latitude, 70{degree}W longitude) to the base of the Palmer Peninsula (72{degree}S latitude, 75{degree}W longitude) and back. At the southern extremity of the flight trajectory the aircraft descended to {approximately} 13 km, turned north, and ascended to 18 km. A general pattern in the ClO distribution is reported: mixing ratios of approximately 10 parts per trillion by volume (pptv) are found at cruise altitude in the vicinity of 55{degree}S increasing to 50 pptv at 60{degree}S. In the vicinity of 65{degree}S latitude a steep gradient in the ClO mixing ratio is observed. At a fixed potential temperature, the ClO mixing ratio increases by an order of magnitude within a very few degrees of latitude through this sharp transition, thus defining the edge of a chemically perturbed region. From the edge of that region to the southern extension of the flights, 72{degree}S, a dome of slowly increasing ClO best describes the distribution. Peak mixing ratios at 18 km at the southern extension of the flight track increased from 800 pptv on August 23 to 1,100 pptv in early September and then increased slowly to 1,200 pptv by the end of the mission on September 22.
- OSTI ID:
- 6996028
- Journal Information:
- Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 94:D14; ISSN 0148-0227; ISSN JGREA
- Country of Publication:
- United States
- Language:
- English
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290301 -- Energy Planning & Policy-- Environment
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54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIRCRAFT
ANTARCTIC REGIONS
ATMOSPHERIC CHEMISTRY
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE COMPOUNDS
CHLORINE OXIDES
DISTRIBUTION
EARTH ATMOSPHERE
ECOLOGICAL CONCENTRATION
GEOGRAPHICAL VARIATIONS
HALOGEN COMPOUNDS
LATITUDE EFFECT
MIXING
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
POLAR REGIONS
SPATIAL DISTRIBUTION
STRATOSPHERE
TIME DEPENDENCE
VARIATIONS
VORTICES