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Source contributions of contemporary biological material remote airsheds of the arid southwestern United States are described. Combined inputs of epicuticular plant waxes and airborne microorganisms range from winter minimum (11. 3-26. 9 ng/m³) to summer maximum ambient mass concentrations (21. 2-41. 4 ng/m³). Concentrations of aromatic resin acids (Le. , dehydroabietic acid and 13-isopropyl-5cu-podocarpa-6, 8, 11, 13-tetraen-l6-oic) plus a thermally matured wood smoke marker (i. e. , ) range from 1. 2 to 9. 6 ng/m³. Minimum levels of resin acids and wood smoke marker are observed for sparse desert vegetation site (low elevation), and levels are found for the transition site of pine and pinyon/juniper forest (high elevation). total wood smoke mass contributions were estimated using the ambient mass concentrations of both the resin acid and wood smoke tracers. Based on estimates, combustion of conifer biomass (e. g. , wildfires, camp fires, home heating) is an important of the organic emission source inventory for desert region.
Mazurek et al. (Mon,) studied this question.