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Prevalence of wide area impacts downwind of freeways under pre-sunrise stable atmospheric conditions
- W. Choi, M. He, S. Paulson
- Environmental Science
- 1 December 2012
Factors controlling pollutant plume length downwind of major roadways in nocturnal surface inversions
- W. Choi, A. Winer, S. Paulson
- Environmental Science
- 30 September 2013
Abstract. A fitting method using a semi-empirical Gaussian dispersion model solution was successfully applied to obtain both dispersion coefficients and a particle number emission factor (PNEF)…
Neighborhood-scale air quality impacts of emissions from motor vehicles and aircraft
- W. Choi, Shishan Hu, S. Paulson
- Environmental Science
- 1 December 2013
Estimating the atmospheric boundary layer height over sloped, forested terrain from surface spectral analysis during BEARPEX
- W. Choi, I. Faloona, M. Mckay, A. Goldstein, B. Baker
- Environmental Science
- 2 November 2010
Abstract. The atmospheric boundary layer (ABL) height ( z i ) over complex, forested terrain is estimated based on the power spectra and the integral length scale of cross-stream winds obtained from…
Air quality impacts of a scheduled 36-h closure of a major highway
- David C. Quiros, Qunfang Zhang, Yifang Zhu
- Environmental Science
- 1 March 2013
Observations of elevated formaldehyde over a forest canopy suggest missing sources from rapid oxidation of arboreal hydrocarbons
- W. Choi, I. Faloona, D. Millet
- Environmental Science
- 17 September 2010
Abstract. To better understand the processing of biogenic VOCs (BVOCs) in the pine forests of the US Sierra Nevada, we measured HCHO at Blodgett Research Station using Quantum Cascade Laser…
Development of a computational fluid dynamics model with tree drag parameterizations: Application to pedestrian wind comfort in an urban area
- G. Kang, Jae-Jin Kim, Dong-Ju Kim, W. Choi, Soo-Jin Park
- Engineering, Environmental Science
- 1 November 2017
Closing the ultrafine particle number concentration budget at road-to-ambient scale: Implications for particle dynamics
- W. Choi, S. Paulson
- Environmental Science
- 11 April 2016
ABSTRACT Freshly emitted vehicle exhaust particles are diluted quickly as they mix into ambient air, but the contribution of evaporation, coagulation, and/or nucleation of new particles to the number…
Evaluating meteorological comparability in air quality studies: Classification and regression trees for primary pollutants in California's South Coast Air Basin
- W. Choi, S. Paulson, J. Casmassi, A. Winer
- Environmental Science
- 2013
Effects of wind fences on the wind environment around Jang Bogo Antarctic Research Station
- Jang-Woon Wang, Jae-Jin Kim, Kyung-soo Han
- EngineeringAdvances in Atmospheric Sciences
- 8 November 2017
This study investigated the flow characteristics altered by Jang Bogo Antarctic Research Station using computational fluid dynamics (CFD) modeling. The topography and buildings around Jang Bogo…
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