Regional transport of the urban workweek: Methylchloroform cycles in the Nevada-Arizona desert
- Washington Univ., St. Louis, MO (USA)
- Desert Research Institute, Reno, NV (USA)
- Scripps Institution of Oceanography, La Jolla, CA (USA)
The halocarbons CFCl{sub 3}, CH{sub 3}CCl{sub 3}, CCl{sub 4}, and C{sub 2}Cl{sub 4} have been monitored at four locations in southern California, southern Nevada, and northwestern Arizona. Summertime concentrations of CH{sub 3}CCl{sub 3} and C{sub 2}Cl{sub 4} at the Nevada and Arizona sites exhibit strong weekly cycles that lag similar cycles observed in the Los Angeles Basin by 1-2 days. The observed patterns imply a nearly complete weekend shutdown of emissions, and remarkably consistent long-range (300-400 km) transport through complex terrain. The average amplitude of the summertime CH{sub 3}CCl{sub 3} cycle is about 1,200 ppt in air leaving the Los Angeles Basin, 80 ppt at the mountain-top Nevada observatory, and 40 ppt at the level-terrain Arizona observatory.
- OSTI ID:
- 6218147
- Journal Information:
- Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 17:8; ISSN 0094-8276; ISSN GPRLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION
AIR POLLUTION MONITORING
ARID LANDS
ARIZONA
CALIFORNIA
CARBON TETRACHLORIDE
CHLORINATED ALIPHATIC HYDROCARBONS
COMPLEX TERRAIN
DESERTS
ECOLOGICAL CONCENTRATION
ENVIRONMENTAL TRANSPORT
FEDERAL REGION IX
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
LONG-RANGE TRANSPORT
MASS TRANSFER
NEVADA
NORTH AMERICA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
POLLUTION
REGIONAL ANALYSIS
TIME DELAY
USA