TY - JOUR
T1 - Water-soluble low molecular weight organics in cloud water at Mt. Tai Mo Shan, Hong Kong
AU - Zhao, Wanyu
AU - Wang, Zhe
AU - Li, Shuwen
AU - Li, Linjie
AU - Wei, Lianfang
AU - Xie, Qiaorong
AU - Yue, Siyao
AU - Li, Tao
AU - Liang, Yiheng
AU - Sun, Yele
AU - Wang, Zifa
AU - Li, Xiangdong
AU - Kawamura, Kimitaka
AU - Wang, Tao
AU - Fu, Pingqing
PY - 2019/12/20
Y1 - 2019/12/20
N2 - Cloud-water samples collected at the summit of Mt. Tai Mo Shan (Mt. TMS, 957 m, a.s.l.), Hong Kong in autumn 2016 and spring 2017 were measured for molecular compositions and stable carbon isotope ratios (δ13C) of dicarboxylic acids, oxoacids and α-dicarbonyls. Oxalic acid (C2, 253–1680 μg L−1) was found as the most abundant diacid, followed by succinic acid (C4, 24–656 μg L−1) in autumn and phthalic acid (Ph, 27–363 μg L−1) in spring. Higher concentrations of Ph (192 ± 197 μg L−1) and terephthalic acid (tPh, 31 ± 15 μg L−1) were observed in autumn than those in spring, illustrating the enhanced contribution from fossil fuel combustion and plastic wastes burning. Stronger correlations for the shorter chain diacids (C2–C4) with NO3 −, nss-SO4 2− and nss-K+ in autumn (R2 ≥ 0.7) than spring suggested that these diacids were mainly produced via atmospheric photooxidation following anthropogenic emissions. The δ13C values of C2 (mean − 14.7‰), glyoxylic acid (ωC2, −12.2‰), pyruvic acid (Pyr, −15.5‰), glyoxal (Gly, −13.5‰) were much higher than those in atmospheric aerosols from isoprene and other precursors, indicating that diacids, oxoacids and α-dicarbonyls in cloud at Mt. TMS were significantly influenced by photochemical formation during the long-range atmospheric transport.
AB - Cloud-water samples collected at the summit of Mt. Tai Mo Shan (Mt. TMS, 957 m, a.s.l.), Hong Kong in autumn 2016 and spring 2017 were measured for molecular compositions and stable carbon isotope ratios (δ13C) of dicarboxylic acids, oxoacids and α-dicarbonyls. Oxalic acid (C2, 253–1680 μg L−1) was found as the most abundant diacid, followed by succinic acid (C4, 24–656 μg L−1) in autumn and phthalic acid (Ph, 27–363 μg L−1) in spring. Higher concentrations of Ph (192 ± 197 μg L−1) and terephthalic acid (tPh, 31 ± 15 μg L−1) were observed in autumn than those in spring, illustrating the enhanced contribution from fossil fuel combustion and plastic wastes burning. Stronger correlations for the shorter chain diacids (C2–C4) with NO3 −, nss-SO4 2− and nss-K+ in autumn (R2 ≥ 0.7) than spring suggested that these diacids were mainly produced via atmospheric photooxidation following anthropogenic emissions. The δ13C values of C2 (mean − 14.7‰), glyoxylic acid (ωC2, −12.2‰), pyruvic acid (Pyr, −15.5‰), glyoxal (Gly, −13.5‰) were much higher than those in atmospheric aerosols from isoprene and other precursors, indicating that diacids, oxoacids and α-dicarbonyls in cloud at Mt. TMS were significantly influenced by photochemical formation during the long-range atmospheric transport.
KW - Dicarboxylic acids
KW - Mt. Tai Mo Shan
KW - Seasonal cloud water
KW - Stable carbon isotopic compositions
UR - http://www.scopus.com/inward/record.url?scp=85071620784&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2019.134095
DO - 10.1016/j.scitotenv.2019.134095
M3 - Journal article
AN - SCOPUS:85071620784
SN - 0048-9697
VL - 697
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 134095
ER -