Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 6 of 6
Full-Text Articles in Entire DC Network
Long-Range Transport Impacts On Surface Aerosol Concentrations And The Contributions To Haze Events In China: An Htap2 Multi-Model Study, Xinyi Dong, Joshua S. Fu, Qingzhao Zhu, Jian Sun, Jiani Tan, Terry Keating, Takashi Sekiya, Kengo Sudo, Louisa Emmons, Simone Tilmes, Jan Eiof Jonson, Michael Schulz, Huisheng Bian, Mian Chin, Yanko Davila, Daven K. Henze, Toshihiko Takemura, Anna Maria Benedictow, Kan Huang
Long-Range Transport Impacts On Surface Aerosol Concentrations And The Contributions To Haze Events In China: An Htap2 Multi-Model Study, Xinyi Dong, Joshua S. Fu, Qingzhao Zhu, Jian Sun, Jiani Tan, Terry Keating, Takashi Sekiya, Kengo Sudo, Louisa Emmons, Simone Tilmes, Jan Eiof Jonson, Michael Schulz, Huisheng Bian, Mian Chin, Yanko Davila, Daven K. Henze, Toshihiko Takemura, Anna Maria Benedictow, Kan Huang
Faculty Publications and Other Works -- Civil & Environmental Engineering
Haze has been severely affecting the densely populated areas in China recently. While many of the efforts have been devoted to investigating the impact of local anthropogenic emission, limited attention has been paid to the contribution from long-range transport. In this study, we apply simulations from six participating models supplied through the Task Force on Hemispheric Transport of Air Pollution phase 2 (HTAP2) exercise to investigate the long-range transport impact of Europe (EUR) and Russia–Belarus–Ukraine (RBU) on the surface air quality in eastern Asia (EAS), with special focus on their contributions during the haze episodes in China. The impact of …
Analysis Of The Co-Existence Of Long-Range Transport Biomass Burning And Dust In The Subtropical West Pacific Region, Xinyi Dong, Joshua Fu, Kan Huang, Neng-Huei Lin, Sheng-Hsiang Wang, Cheng-En Yang
Analysis Of The Co-Existence Of Long-Range Transport Biomass Burning And Dust In The Subtropical West Pacific Region, Xinyi Dong, Joshua Fu, Kan Huang, Neng-Huei Lin, Sheng-Hsiang Wang, Cheng-En Yang
Faculty Publications and Other Works -- Civil & Environmental Engineering
Biomass burning and wind-blown dust has been well investigated during the past decade regarding their impacts on environment, but their co-existence hasn’t been recognized because they usually occur in different locations and episodes. In this study we reveal the unique co-existence condition that dust from the Taklamakan and Gobi Desert (TGD) and biomass burning from Peninsular Southeast Asia (PSEA) can reach to the west Pacific region simultaneously in boreal spring (March and April). The upper level trough at 700hPa along east coast of China favors the large scale subsidence of TGD dust while it travels southeastwards, and drives the PSEA …
Model Development Of Dust Emission And Heterogeneous Chemistry Within The Community Multiscale Air Quality Modeling System And Its Application Over East Asia, Xinyi Dong, Joshua S. Fu, Kan Huang, Daniel Tong, Guoshun Zhuang
Model Development Of Dust Emission And Heterogeneous Chemistry Within The Community Multiscale Air Quality Modeling System And Its Application Over East Asia, Xinyi Dong, Joshua S. Fu, Kan Huang, Daniel Tong, Guoshun Zhuang
Faculty Publications and Other Works -- Civil & Environmental Engineering
The Community Multiscale Air Quality (CMAQ) model has been further developed in terms of simulating natural wind-blown dust in this study, with a series of modifications aimed at improving the model's capability to predict the emission, transport, and chemical reactions of dust. The default parameterization of initial threshold friction velocity constants are revised to correct the double counting of the impact of soil moisture in CMAQ by the reanalysis of field experiment data; source-dependent speciation profiles for dust emission are derived based on local measurements for the Gobi and Taklamakan deserts in East Asia; and dust heterogeneous chemistry is also …
Impact Of Anthropogenic Emission On Air Quality Over A Megacity – Revealed From An Intensive Atmospheric Campaign During The Chinese Spring Festival, K Huang, G Zhuang, Y Lin, Q Wang, Joshua S. Fu, R Zhang, J Li, C Deng, Q Fu
Impact Of Anthropogenic Emission On Air Quality Over A Megacity – Revealed From An Intensive Atmospheric Campaign During The Chinese Spring Festival, K Huang, G Zhuang, Y Lin, Q Wang, Joshua S. Fu, R Zhang, J Li, C Deng, Q Fu
Faculty Publications and Other Works -- Civil & Environmental Engineering
The Chinese Spring Festival is one of the most important traditional festivals in China. The peak transport in the Spring Festival season (spring travel rush) provides a unique opportunity for investigating the impact of human activity on air quality in the Chinese megacities. Emission sources are varied and fluctuate greatly before, during and after the Festival. Increased vehicular emissions during the "spring travel rush" before the 2009 Festival resulted in high level pollutants of NOx (270 μg m−3), CO (2572 μg m−3), black carbon (BC) (8.5 μg m−3) and extremely low single scattering …
Typical Types And Formation Mechanisms Of Haze In An Eastern Asia Megacity, Shanghai, K Huang, G Zhuang, Joshua S. Fu, Q Wang, T Liu, R Zhang, Y Jiang, C Deng, Q Fu, N C. Hsu, B Cao
Typical Types And Formation Mechanisms Of Haze In An Eastern Asia Megacity, Shanghai, K Huang, G Zhuang, Joshua S. Fu, Q Wang, T Liu, R Zhang, Y Jiang, C Deng, Q Fu, N C. Hsu, B Cao
Faculty Publications and Other Works -- Civil & Environmental Engineering
An intensive aerosol and gases campaign was performed at Shanghai in the Yangtze River Delta region over Eastern China from late March to early June 2009. This study provided a complementary picture of typical haze types and the formation mechanisms in megacities over China by using a synergy of ground-based monitoring, satellite and lidar observations. During the whole study period, several extreme low visibility periods were observed with distinct characteristics, and three typical haze types were identified, i.e. secondary inorganic pollution, dust, and biomass burning. Sulfate, nitrate and ammonium accounted for a major part of PM2.5 mass during the …
Characteristics, Sources And Formation Of Aerosol Oxalate In An Eastern Asia Megacity And Its Implication To Haze Pollution, Y Jiang, G Zhuang, Q Wang, T Liu, K Huang, Joshua S. Fu, J Li, Y Lin, R Zhang, C Deng
Characteristics, Sources And Formation Of Aerosol Oxalate In An Eastern Asia Megacity And Its Implication To Haze Pollution, Y Jiang, G Zhuang, Q Wang, T Liu, K Huang, Joshua S. Fu, J Li, Y Lin, R Zhang, C Deng
Faculty Publications and Other Works -- Civil & Environmental Engineering
A total of 238 samples of PM2.5 and TSP were analyzed to study the characteristics, sources, and formation pathways of aerosol oxalate in Shanghai in four seasons of 2007. The concentrations of oxalate were 0.07–0.41 μg m−3 in PM2.5 and 0.10–0.48 μg m−3 in TSP, respectively. Oxalate displayed a seasonal variation of autumn>summer>winter>spring in both PM2.5 and TSP and was dominantly present in PM2.5 in all samples. Correlation between oxalate and K+ and high ratio of oxalate/K+ suggested that biomass burning was a secondary source of aerosol oxalate in …