Spatial representativeness and scales of transport during the 1995 integrated monitoring study in California's San Joaquin Valley

摘要: Abstract Daily measurements of PM10 mass and chemical composition were obtained for the period 1–14 November 1995 from a saturation monitoring network around Corcoran, varying portions 9 December 1995–6 January 1996 three networks Bakersfield, Fresno, Kern Wildlife Refuge, in California's San Joaquin Valley. During latter period, locations also operated along boundaries across width The Fresno consisted 12–25 sites, located areas about 300–800 km2. Each included one core site, situated at pre-existing location, with more extensive temporally resolved measurements. Mean concentrations its constituents varied core-site by 20% or over distances ranging 4 to 14 km. Local source influences observed affect sites less than 1 km, but primary particulate emissions transported urban sub-regional scales approximately 10–30 km during winter greater 30 km fall. winter, gas-phase precursors secondary aerosol may have been 100 km, little evidence was found transport PM on such scale.