IMPACTS OF BIOGENIC AND ANTHOROPOGENIC EMISSIONS ON OZONE AND SECONDARY ORGANIC AEROSOL
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Atmospheric fine particles and ozone (O3) are correlated with adverse health effects, visibility reduction, and climate change. In recent decades, China has suffered from the record-breaking severe haze event and elevated ozone problems. Recent field measurements show that organic carbon (OC) was one of the major components during haze events, and it has been suggested that secondary organic aerosol (SOA) could account for a significant fraction of the total observed OC. Quantitative knowledge of the contributions of different emissions sources to SOA and ozone concentrations is significant to better understand their formation mechanisms and is useful to develop the effective emission control strategies. A Community Multiscale Air Quality (CMAQ) model with source-oriented lumped SAPRC-11 (S11L) photochemical mechanism is applied to determine the contributions of anthropogenic and biogenic sources to SOA and ozone concentrations in China. In China, predicted SOA concentrations are generally higher in summer (10-15 µg· M^-3) due to large contributions of biogenic emissions within China (country average ~60%) and in winter due to industrial and residential sectors (country average ~78% total) based on the Multi-resolution Emission Inventory for China (MEIC) emission inventory. However, the transportation sector (~30-40% vs. ~5% by MEIC) is predicted to be much more important while the residential (~21-24% vs. ~42%) sector is predicted to be less important based on The Regional Emission inventory in ASia v2.1(REAS2) emissions. These discrepancies in source contributions to SOA needs to be further investigated as the country seeks optimal emission control strategies to fight severe air pollution. The ozone attribution scheme based on the three-regime definition was incorporated into the CMAQ model to quantify NOx and VOC contributions to ozone concentrations in China in August 2013. Most of the areas considered by the two-regime approach as NOx or VOC-limited are classified as transitional under the new three-regime scheme, and the scattered VOC-limited regimes are located in urban areas. This three-regime approach represents an improvement from the traditional two-regime approach with only NOx or VOC-limited regimes. This three-regime method then is applied in the ozone source apportionment as well, and it is reported that the industries, transportation, power and biogenic sources are four major emission contributors to ozone with different spatial distributions.
Wang, Peng (2018). IMPACTS OF BIOGENIC AND ANTHOROPOGENIC EMISSIONS ON OZONE AND SECONDARY ORGANIC AEROSOL. Doctoral dissertation, Texas A & M University. Available electronically from