Spatial and temporal variations in San Joaquin Valley fog chemistry

Four different types of fog samplers were used to collect and characterize the fog chemistry in the San Joaquin Valley, CA, at four different locations. Resulting data are presented, which compare and contrast northern and southern regions, urban and rural locations, and different altitudes above th...

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Bibliographic Details
Published in:Atmospheric environment (1994) 1999, Vol.33 (1), p.129-140
Main Authors: COLLETT, J. L, HOAG, K. J, SHERMAN, D. E, BATOR, A, RICHARDS, L. W
Format: Article
Language:English
Subjects:
Earth, ocean, space
Exact sciences and technology
External geophysics
Meteorology
Water in the atmosphere (humidity, clouds, evaporation, precipitation)
Online Access:Get full text
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Summary:Four different types of fog samplers were used to collect and characterize the fog chemistry in the San Joaquin Valley, CA, at four different locations. Resulting data are presented, which compare and contrast northern and southern regions, urban and rural locations, and different altitudes above the valley floor. Results show that large drops were consistently more alkaline than small drops, with pH differences sometimes exceeding one pH unit. Liquid-water content was observed to increased with height, while fog-drop aqueous-ion concentrations decreased. Fog at all locations was usually basic as compared with typical background atmospheric water pH values, which was attributed to the large inputs of ammonia arising from the significant agricultural activity in the valley. Except for a sulfate concentration spike at Bakersfield, the fog composition of the major inorganic ions was roughly comparable among study locations.
ISSN:1352-2310
1873-2844