Blue Hazes in the Atmosphere

Went, F. W.

doi:10.1038/187641a0

Cited by 389 publications

(205 citation statements)

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“…63 These nucleation events have been found to be associated with high SO 2 concentrations and, therefore, to correspond to the nucleation of sulfate particles (either binary nucleation of H 2 SO 4 and water or ternary nucleation of H 2 SO 4 , ammonium, and water to form ammonium sulfate). Nucleation of organic particles is also possible, as observed, for example, in the Blue Ridge Mountains of Virginia 64 or the Blue Mountains of New South Wales, Australia. 65 The focus is here on the ambient measurements of UFPM related to mobile source emissions.…”

Section: Evolution Of Ufpm In the Atmospherementioning

confidence: 99%

Current Understanding of Ultrafine Particulate Matter Emitted from Mobile Sources

Seigneur

2009

Journal of the Air & Waste Management Association

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The physics and chemistry of ultrafine particulate matter (UFPM) associated with mobile source emissions is reviewed. UFPM includes those particles that are less than 0.1 m in diameter. Measurements of UFPM emitted from mobile sources have been conducted in the laboratory, on roadways, and downwind of roadways. In addition, UFPM formation and evolution have been modeled and the modeling results have been compared with available measurements. The results of those measurement programs and modeling studies are synthesized into a coherent description of the formation of UFPM in mobile source emissions and its subsequent evolution in the ambient atmosphere. Recommendations are provided to address the gaps in our current understanding of the processes leading to the formation of UFPM, its chemical composition, and its evolution in the atmosphere.

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Section: Evolution Of Ufpm In the Atmospherementioning

confidence: 99%

Current Understanding of Ultrafine Particulate Matter Emitted from Mobile Sources

Seigneur

2009

Journal of the Air & Waste Management Association

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“…As the culmination of several years of study by various investigators, the latest research will necessitate revision of textbook accounts of the process. On pages 764 and 768 of this issue, Bell and Bhandoola 1 and Wada et al 2 provide definitive evidence that a central aspect of blood-cell differentiation requires a rethink. Taken together with preceding work, their results show that a previously well-recognized distinction between two developmental lineages -lymphoid and myeloid -does not apply.…”

Section: Thomas Grafmentioning

confidence: 99%

Are plant emissions green?

Guenther

2008

Nature

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“…The possibility that biogenic VOC could have an impact on local and regional air quality was first noted by Went (1960), who documented the emission of biogenic VOC from trees and proposed that their oxidation could give rise to the so-called ''blue hazes'' often seen in forested areas. Subsequent studies further defined the speciation, magnitude, and mechanisms of biogenic VOC emissions from specific vegetation sources (Guenther et al, , 2000Harley et al, 1999;Helmig et al, 1998Helmig et al, , 1999Lamb et al, 1985;Rasmussen, 1972;Simpson et al, 1995Simpson et al, , 1999Fall and Wildermuth, 1998;Zimmerman, 1979).…”

Section: Introductionmentioning

confidence: 99%

Past and present-day biogenic volatile organic compound emissions in East Asia

Steiner

Luo

Huang

2002

Atmospheric Environment

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Biogenic volatile organic carbon (VOC) emissions from vegetation in East Asia are estimated for two contrasting land-cover scenarios: near present-day conditions derived from satellite data and pre-disturbed land-cover based on climatological parameters and plant functional type. Hourly fluxes of isoprene and monoterpenes are calculated on a grid of 60 km Â 60 km cells covering much of East Asia using meteorological conditions derived from a 12-month simulation of the region using regional climate model, monthly leaf area indexes, and the Guenther et al. (J. Geophys. Res. 101 (1995) 1345) ecosystem-dependent emission factors. Total present-day isoprene emissions are estimated at approximately 12 Tg C yr À1 and monoterpene emissions at 6 Tg C yr À1 . These emissions are approximately 5.4 and 4 Tg C yr À1 lower than the estimated pre-disturbed emissions of isoprene and monoterpenes, respectively, largely due to the conversion of forested land to cropland. ORVOC emission estimates for the present-day scenario, obtained by assuming a constant ORVOC emission factor for all ecosystems, are slightly higher in magnitude than isoprene emissions. Present-day totals of combined biogenic and anthropogenic VOC emissions are generally larger than biogenic VOC emissions in the pre-disturbed scenario, indicating that human activities have led to a net increase in the atmospheric source of VOC in East Asia. r

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Blue Hazes in the Atmosphere

Cited by 389 publications

References 0 publications

Current Understanding of Ultrafine Particulate Matter Emitted from Mobile Sources

Current Understanding of Ultrafine Particulate Matter Emitted from Mobile Sources

Are plant emissions green?

Past and present-day biogenic volatile organic compound emissions in East Asia

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