A combined modeling and measurement technique for estimating windblown dust emissions at Owens (dry) Lake, California

摘要: [1] The problem of dust emissions from playa sources is an important one both in terms human health and global issues, distribution loess, mineral cycling. A refined method modeling atmospheric concentrations due to wind erosion was developed using real-time saltation flux measurements ambient monitoring data at Owens Lake, California. This may have practical applications for the effects other areas. Windblown Lake bed often causes violations federal air quality standards particulate matter (PM10) that are highest levels measured United States. The goal this study locate source areas on exposed lake bed, estimate their PM10 emissions, use pollution techniques determine which caused or contributed violations. Previous research indicates vertical (Fa) generally proportional total horizontal (q) a given soil texture surface condition. For study, hourly were estimated Fa = K′ × m15, where m15 sand 15 cm above surface, derived empirically by comparing model predictions monitored concentrations. Hourly 135 sites (1 km spacing) six off-lake 30 month period. found change spatially temporally over sampling These changes appeared be linked different textures seasonal changes. values compared favorably with Fa/q portable tunnel micrometeorological methods. trends model-predicted agreed well Dust production 7.2 104 t 12 single storm accounted 9% annual 6.5 103 t. results used identify 77 km2 dust-producing will controlled attain standard PM10.