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Chemical evolution of an isolated power plant plume during the TexAQS 2000 study

Springston, Stephen R. / Kleinman, Lawrence I. / Brechtel, Frederick / Lee, Yin-Nan / Nunnermacker, Linda J. / Wang, Jian

AbstractStack emissions from a coal-burning power plant were measured during a research flight of the DOE G-1 during the Texas Air Quality Study (TexAQS 2000) on 10 September 2000. Clean upstream air and an isolated location allowed the plume to be unambiguously sampled during 12 successive downwind transects to a distance of 63km—corresponding to a processing time of 4.6h. The chemical transformation rates of sulfur and nitrogen primary pollutants into aerosol SO $_{4}^{2 -}$ and HNO $_{3}$ yield independent values of OH concentration (8.0 and $11 \times 10^{6}$ cm $^{- 3}$ , respectively) that are consistent within experimental uncertainty and qualitatively agree with constrained steady-state (CSS) box model calculations. Ozone production efficiency increases with plume age as expected. Primary aerosol emissions with $D_{p} > 5$ $μ$ m were sampled near the stack. As the plume ages, aerosol size distributions adjusted for dilution show constant number concentrations of aerosols $D_{p} > 10$ nm and a marked increase in accumulation-mode particles ( $D_{p} > 0.1$ $μ$ m) as gas-to-particle-conversion causes smaller particles to grow.

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Chemical evolution of an isolated power plant plume during the TexAQS 2000 study

Springston, Stephen R. / Kleinman, Lawrence I. / Brechtel, Frederick / Lee, Yin-Nan / Nunnermacker, Linda J. / Wang, Jian

AbstractStack emissions from a coal-burning power plant were measured during a research flight of the DOE G-1 during the Texas Air Quality Study (TexAQS 2000) on 10 September 2000. Clean upstream air and an isolated location allowed the plume to be unambiguously sampled during 12 successive downwind transects to a distance of 63km—corresponding to a processing time of 4.6h. The chemical transformation rates of sulfur and nitrogen primary pollutants into aerosol SO $_{4}^{2 -}$ and HNO $_{3}$ yield independent values of OH concentration (8.0 and $11 \times 10^{6}$ cm $^{- 3}$ , respectively) that are consistent within experimental uncertainty and qualitatively agree with constrained steady-state (CSS) box model calculations. Ozone production efficiency increases with plume age as expected. Primary aerosol emissions with $D_{p} > 5$ $μ$ m were sampled near the stack. As the plume ages, aerosol size distributions adjusted for dilution show constant number concentrations of aerosols $D_{p} > 10$ nm and a marked increase in accumulation-mode particles ( $D_{p} > 0.1$ $μ$ m) as gas-to-particle-conversion causes smaller particles to grow.

Chemical evolution of an isolated power plant plume during the TexAQS 2000 study

Springston, Stephen R. / Kleinman, Lawrence I. / Brechtel, Frederick / Lee, Yin-Nan / Nunnermacker, Linda J. / Wang, Jian

AbstractStack emissions from a coal-burning power plant were measured during a research flight of the DOE G-1 during the Texas Air Quality Study (TexAQS 2000) on 10 September 2000. Clean upstream air and an isolated location allowed the plume to be unambiguously sampled during 12 successive downwind transects to a distance of 63km—corresponding to a processing time of 4.6h. The chemical transformation rates of sulfur and nitrogen primary pollutants into aerosol SO $_{4}^{2 -}$ and HNO $_{3}$ yield independent values of OH concentration (8.0 and $11 \times 10^{6}$ cm $^{- 3}$ , respectively) that are consistent within experimental uncertainty and qualitatively agree with constrained steady-state (CSS) box model calculations. Ozone production efficiency increases with plume age as expected. Primary aerosol emissions with $D_{p} > 5$ $μ$ m were sampled near the stack. As the plume ages, aerosol size distributions adjusted for dilution show constant number concentrations of aerosols $D_{p} > 10$ nm and a marked increase in accumulation-mode particles ( $D_{p} > 0.1$ $μ$ m) as gas-to-particle-conversion causes smaller particles to grow.

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Title:

Chemical evolution of an isolated power plant plume during the TexAQS 2000 study

Contributors:

Springston, Stephen R. (author) / Kleinman, Lawrence I. (author) / Brechtel, Frederick (author) / Lee, Yin-Nan (author) / Nunnermacker, Linda J. (author) / Wang, Jian (author)

Published in:

Atmospheric Environment ; 39 ; 3431-3443

Publication date:

2005-01-20

Size:

13 pages

ISSN:

DOI:

https://doi.org/10.1016/j.atmosenv.2005.01.060

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Power-plant plume , Texas 2000 Air Quality Study , Aerosol growth , Airborne measurements

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