Aerosol composition in a stagnant air mass impacted by dense fogs: preliminary results

Conference · Sun Jan 01 04:00:00 EST 1984 · Proc., Annu. Meet., Air Pollut. Control Assoc.; (United States)

OSTI ID:5888936

Jacob, D J; Munger, J W; Waldman, J M; Hoffman, M R

Over the last two winters, our research group has been investigating the chemical composition of fogwater and haze aerosol during wintertime stagnation episodes in the San Joaquin Valley of California. The valley is encompassed by mountain ranges. During the winter a strong subsidence inversion based below the natural boundaries of the valley restricts the ventilation of the air masses below the inversion. The residence time of an air parcel in the valley under these stagnation conditions is on the order of 8 days. Because the trapped air is very humid, stagnation episodes are associated with a persistent thick haze and frequent widespread nighttime fogs. During the winter 1982-1983 the authors sampled fog and haze at one site (Bakersfield); results from this preliminary study have been discussed in detail in a previous report. In the winter 1983-1984 the scale of the program was expanded in order to test hypotheses formulated as a result of first year data. The present paper first reports briefly on the 1982-1983 results and outlines the essential conclusions. They then describe the large-scale experiment conducted during the winter of 1983-1984, and discuss some preliminary fogwater data.

• Research Organization: California Inst. of Tech., Pasadena, CA
• OSTI ID: 5888936
• Report Number(s): CONF-840612-
• Conference Information: Journal Name: Proc., Annu. Meet., Air Pollut. Control Assoc.; (United States) Journal Volume: 2
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR POLLUTION MONITORING
ATMOSPHERIC CHEMISTRY
CALIFORNIA
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
COLLOIDS
DATA
DISPERSIONS
EXPERIMENTAL DATA
FEDERAL REGION IX
FLUIDS
FOG
GASES
HYPOTHESIS
INFORMATION
NORTH AMERICA
NUMERICAL DATA
RESEARCH PROGRAMS
SAMPLING
SEASONAL VARIATIONS
SOLS
USA
VAPORS
VARIATIONS
WATER VAPOR