TY - JOUR
T1 - Real-time geochemistry of urban aerosol during a heavy dust episode by single-particle aerosol mass spectrometer
T2 - Spatio-temporal variability, mixing state and spectral distribution
AU - Shen, Lijuan
AU - Hao, Feng
AU - Gao, Meng
AU - Wang, Honglei
AU - Zhu, Bin
AU - Gao, Jimei
AU - Cheng, Yufei
AU - Xie, Fei
N1 - Funding Information:
This study was supported by the National Key Research and Development Program of China ( 2016YFA0602003 ), the Ministry of Science and Technology of China ( 2017YFC0210000 ), the National Natural Science Foundation of China ( 41805096 and 41830965 ), the Natural Science Foundation of Jiangsu Province ( BK20180801 ), the Natural Science Research Project for Universities of Jiangsu Province, China ( 18KJB170011 ), the China Postdoctoral Science Foundation ( 2018M640169 ).
PY - 2020/12
Y1 - 2020/12
N2 - A heavy dust episode occurred from May 3 to 8, 2017 in China, with an influenced area exceeding 1.63 million km2. In this work, the mixing state of aerosols and their spectral distributions were simultaneously observed in the sand source region of Hohhot and the long-range dust transport region of Nanjing by using a single-particle aerosol mass spectrometer (SPAMS). The duration time of this dust episode was 37–40 h in Hohhot and prolonged to 51–104 h in Nanjing. Totals of 336,135 (Hohhot) and 235,840 (Nanjing) particles in PM2.5 were successfully ionized to identify 10 main particle classes. During this episode, aerosol particles including OCEC (30.65%), K (22.42%), K-CN (17.03%), sodium (9.46%), heavy metal (8.96%), EC-sulfate (3.46%) and Al (3.22%) were prevailing in Hohhot and were dominated by EC-sulfate (22.26%), OCEC (15.21%), heavy metal (11.96%), K (13.68%), sodium (12.27%), Al (10.54%) and EC (9.02%) in Nanjing. The spectral distribution peaked at 0.66 μm during the dust episode in Nanjing, 0.12 μm larger than the peak size in the non-dust episode. Strong signals at −62[NO3]− and −61[HCO3]−/−61[C5H]− for aerosol particles were observed in Hohhot and Nanjing respectively. The proportions of K-CN, sodium, heavy mental, OCEC and EC-sulfate particles in the dust episode of Hohhot were 2.75, 1.41, 1.80, 1.22 and 1.28 times as large as the values in the non-dust episode. For Nanjing, the fractions of EC-sulfate, EC, Al particles in the dust episode were 10.55, 4.65 and 1.46 times higher than values in the non-dust episode. The proportions of EC-secondary and EC-nitrate particles were found to decrease in the dust episode in the two regions.
AB - A heavy dust episode occurred from May 3 to 8, 2017 in China, with an influenced area exceeding 1.63 million km2. In this work, the mixing state of aerosols and their spectral distributions were simultaneously observed in the sand source region of Hohhot and the long-range dust transport region of Nanjing by using a single-particle aerosol mass spectrometer (SPAMS). The duration time of this dust episode was 37–40 h in Hohhot and prolonged to 51–104 h in Nanjing. Totals of 336,135 (Hohhot) and 235,840 (Nanjing) particles in PM2.5 were successfully ionized to identify 10 main particle classes. During this episode, aerosol particles including OCEC (30.65%), K (22.42%), K-CN (17.03%), sodium (9.46%), heavy metal (8.96%), EC-sulfate (3.46%) and Al (3.22%) were prevailing in Hohhot and were dominated by EC-sulfate (22.26%), OCEC (15.21%), heavy metal (11.96%), K (13.68%), sodium (12.27%), Al (10.54%) and EC (9.02%) in Nanjing. The spectral distribution peaked at 0.66 μm during the dust episode in Nanjing, 0.12 μm larger than the peak size in the non-dust episode. Strong signals at −62[NO3]− and −61[HCO3]−/−61[C5H]− for aerosol particles were observed in Hohhot and Nanjing respectively. The proportions of K-CN, sodium, heavy mental, OCEC and EC-sulfate particles in the dust episode of Hohhot were 2.75, 1.41, 1.80, 1.22 and 1.28 times as large as the values in the non-dust episode. For Nanjing, the fractions of EC-sulfate, EC, Al particles in the dust episode were 10.55, 4.65 and 1.46 times higher than values in the non-dust episode. The proportions of EC-secondary and EC-nitrate particles were found to decrease in the dust episode in the two regions.
KW - Aerosol
KW - Dust storm
KW - Mixing state
KW - SPAMS
KW - Spectral distribution
UR - http://www.scopus.com/inward/record.url?scp=85083801031&partnerID=8YFLogxK
U2 - 10.1016/j.partic.2020.02.001
DO - 10.1016/j.partic.2020.02.001
M3 - Journal article
AN - SCOPUS:85083801031
SN - 1674-2001
VL - 53
SP - 197
EP - 207
JO - Particuology
JF - Particuology
ER -