TY - JOUR
T1 - Contribution of biogenic sources to secondary organic aerosol in the summertime in Shaanxi, China
AU - Xu, Yong
AU - Chen, Yonggui
AU - Gao, Jingsi
AU - Zhu, Shengqiang
AU - Ying, Qi
AU - Hu, Jianlin
AU - Wang, Peng
AU - Feng, Liguo
AU - Kang, Haibin
AU - Wang, Dexiang
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/9
Y1 - 2020/9
N2 - A revised Community Multi-scale Air Quality (CMAQ) model with updated secondary organic aerosol (SOA) yields and a more detailed description of SOA formation from isoprene (ISOP) oxidation was applied to study the spatial distribution of SOA, its components and precursors in Shaanxi in July of 2013. The emissions of biogenic volatile organic compounds (BVOCs) were generated using the Model of Emissions of Gases and Aerosols from Nature (MEGAN), of which ISOP and monoterpene (MONO) were the top two, with 1.73 × 109 mol and 1.82 × 108 mol, respectively. The spatial distribution of BVOCs emission was significantly correlated with the vegetation coverage distribution. ISOP and its intermediate semi-volatile gases were up to ∼7.0 and ∼1.4 ppb respectively in the ambient. SOA was generally 2–6 μg/m3, of which biogenic SOA (BSOA) accounted for as high as 84% on average. There were three main BVOCs Precursors including ISOP (58%) and MONO (8%) emit in the studied domain, and ISOP (9%) transported. The Guanzhong Plain had the highest BSOA concentrations of 3–5 μg/m3, and the North Shaanxi had the lowest of 2–3 μg/m3. More than half of BSOA was due to reactive surface uptake of ISOP epoxide (0.2–0.7 μg/m3, ∼19%), glyoxal (GLY) (0.2–0.5 μg/m3, ∼11%) and methylglyoxal (MGLY) (0.4–1.4 μg/m3, ∼32%), while the remaining was due to the traditional equilibrium partitioning of semi-volatile components (0.1–1.2 μg/m3, ∼25%) and oligomerization (0.2–0.4 μg/m3, ∼12%). Overall, SOA formed from ISOP contributed 1–3 μg/m3 (∼80%) to BSOA.
AB - A revised Community Multi-scale Air Quality (CMAQ) model with updated secondary organic aerosol (SOA) yields and a more detailed description of SOA formation from isoprene (ISOP) oxidation was applied to study the spatial distribution of SOA, its components and precursors in Shaanxi in July of 2013. The emissions of biogenic volatile organic compounds (BVOCs) were generated using the Model of Emissions of Gases and Aerosols from Nature (MEGAN), of which ISOP and monoterpene (MONO) were the top two, with 1.73 × 109 mol and 1.82 × 108 mol, respectively. The spatial distribution of BVOCs emission was significantly correlated with the vegetation coverage distribution. ISOP and its intermediate semi-volatile gases were up to ∼7.0 and ∼1.4 ppb respectively in the ambient. SOA was generally 2–6 μg/m3, of which biogenic SOA (BSOA) accounted for as high as 84% on average. There were three main BVOCs Precursors including ISOP (58%) and MONO (8%) emit in the studied domain, and ISOP (9%) transported. The Guanzhong Plain had the highest BSOA concentrations of 3–5 μg/m3, and the North Shaanxi had the lowest of 2–3 μg/m3. More than half of BSOA was due to reactive surface uptake of ISOP epoxide (0.2–0.7 μg/m3, ∼19%), glyoxal (GLY) (0.2–0.5 μg/m3, ∼11%) and methylglyoxal (MGLY) (0.4–1.4 μg/m3, ∼32%), while the remaining was due to the traditional equilibrium partitioning of semi-volatile components (0.1–1.2 μg/m3, ∼25%) and oligomerization (0.2–0.4 μg/m3, ∼12%). Overall, SOA formed from ISOP contributed 1–3 μg/m3 (∼80%) to BSOA.
KW - BSOA
KW - CMAQ
KW - Isoprene
KW - MEGAN
KW - Precursors
UR - https://www.webofscience.com/wos/woscc/full-record/WOS:000538150400064
UR - https://openalex.org/W3017808483
UR - https://www.scopus.com/pages/publications/85084138389
U2 - 10.1016/j.chemosphere.2020.126815
DO - 10.1016/j.chemosphere.2020.126815
M3 - Journal Article
SN - 0045-6535
VL - 254
JO - Chemosphere
JF - Chemosphere
M1 - 126815
ER -