Articles | Volume 22, issue 12
https://doi.org/10.5194/acp-22-8369-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-22-8369-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Measurement report
| 
29 Jun 2022
Measurement report |
| 29 Jun 2022
| 29 Jun 2022
Measurement report: The importance of biomass burning in light extinction and direct radiative effect of urban aerosol during the COVID-19 lockdown in Xi'an, China
Jie Tian
Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
CAS Center for Excellence in Quaternary Science and Global Change,
Xi'an 710061, China
Qiyuan Wang
CORRESPONDING AUTHOR
Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
CAS Center for Excellence in Quaternary Science and Global Change,
Xi'an 710061, China
National Observation and Research Station of Regional Ecological
Environment Change and Comprehensive Management in the Guanzhong Plain,
Shaanxi, Xi'an 710061, China
Huikun Liu
Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
Yongyong Ma
Meteorological Institute of Shaanxi Province, Xi'an 710015, China
Suixin Liu
Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
CAS Center for Excellence in Quaternary Science and Global Change,
Xi'an 710061, China
Yong Zhang
Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
Weikang Ran
Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
Yongming Han
Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
CAS Center for Excellence in Quaternary Science and Global Change,
Xi'an 710061, China
National Observation and Research Station of Regional Ecological
Environment Change and Comprehensive Management in the Guanzhong Plain,
Shaanxi, Xi'an 710061, China
Junji Cao
CORRESPONDING AUTHOR
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing
100029, China
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Revised manuscript not accepted
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Jiarui Wu, Naifang Bei, Yuan Wang, Xia Li, Suixin Liu, Lang Liu, Ruonan Wang, Jiaoyang Yu, Tianhao Le, Min Zuo, Zhenxing Shen, Junji Cao, Xuexi Tie, and Guohui Li
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Huikun Liu, Qiyuan Wang, Li Xing, Yong Zhang, Ting Zhang, Weikang Ran, and Junji Cao
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Qiyuan Wang, Huikun Liu, Ping Wang, Wenting Dai, Ting Zhang, Youzhi Zhao, Jie Tian, Wenyan Zhang, Yongming Han, and Junji Cao
Atmos. Chem. Phys., 20, 15537–15549, https://doi.org/10.5194/acp-20-15537-2020, https://doi.org/10.5194/acp-20-15537-2020, 2020
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Qiyuan Wang, Li Li, Jiamao Zhou, Jianhuai Ye, Wenting Dai, Huikun Liu, Yong Zhang, Renjian Zhang, Jie Tian, Yang Chen, Yunfei Wu, Weikang Ran, and Junji Cao
Atmos. Chem. Phys., 20, 15427–15442, https://doi.org/10.5194/acp-20-15427-2020, https://doi.org/10.5194/acp-20-15427-2020, 2020
Short summary
Short summary
Recently, China has promulgated a series of regulations to reduce air pollutants. The decreased black carbon (BC) and co-emitted pollutants could affect the interactions between BC and other aerosols, which in turn results in changes in BC. Herein, we re-assessed the characteristics of BC of a representative pollution site in northern China in the final year of the Chinese
Action Plan for the Prevention and Control of Air Pollution.
Cited articles
Ålander, T., Antikainen, E., Raunemaa, T., Elonen, E., Rautiola, A., and
Torkkell, K.: Particle emissions from a small two-stroke engine: Effects of
fuel, lubricating oil, and exhaust aftertreatment on particle
characteristics, Aerosol Sci. Tech., 39, 151–161, https://doi.org/10.1080/027868290910224, 2005.
Andreae, M. O. and Gelencsér, A.: Black carbon or brown carbon? The nature of light-absorbing carbonaceous aerosols, Atmos. Chem. Phys., 6, 3131–3148, https://doi.org/10.5194/acp-6-3131-2006, 2006.
Bellouin, N., Quaas, J., Morcrette, J.-J., and Boucher, O.: Estimates of aerosol radiative forcing from the MACC re-analysis, Atmos. Chem. Phys., 13, 2045–2062, https://doi.org/10.5194/acp-13-2045-2013, 2013.
Cao, J. J., Wang, Q. Y., Chow, J. C., Watson, J. G., Tie, X. X., Shen, Z.
X., Wang, P., and An, Z. S.: Impacts of aerosol compositions on visibility
impairment in Xi'an, China, Atmos. Environ., 59, 559–566,
https://doi.org/10.1016/j.atmosenv.2012.05.036, 2012.
Chamberlain-Ward, S. and Sharp, F.: Advances in Nephelometry through the
Ecotech Aurora Nephelometer, Sci. World J., 11, 2530–2535,
https://doi.org/10.1100/2011/310769, 2011.
Chen, L. W. and Cao, J.: PM2.5 source apportionment using a Hybrid
Environmental Receptor Model, Environ. Sci. Technol., 52, 6357–6369,
https://doi.org/10.1021/acs.est.8b00131, 2018.
Chen, Y., Zhang, S. M., Peng, C., Shi, G. M., Tian, M., Huang, R. J., Guo,
D. M., Wang, H. B., Yao, X. J., and Yang, F. M.: Impact of the COVID-19
pandemic and control measures on air quality and aerosol light absorption in
southwestern China, Sci. Total Environ., 749, 141419,
https://doi.org/10.1016/j.scitotenv.2020.141419, 2020.
Cheng, M. T., Tang, G. Q., Lv, B., Li, X. R., Wu, X. R., Wang, Y. M., and
Wang, Y. S.: Source apportionment of PM2.5 and visibility in Jinan,
China, J. Environ. Sci., 102, 207–215,
https://doi.org/10.1016/j.jes.2020.09.012, 2021.
Cheng, Z., Jiang, J. K., Chen, C. H., Gao, J., Wang, S. X., Watson, J. G.,
Wang, H. L., Deng, J. G., Wang, B. Y., Zhou, M., Chow, J. C., Pitchford, M.
L., and Hao, J. M.: Estimation of aerosol mass scattering efficiencies under
high mass loading: Case study for the megacity of Shanghai, China, Environ.
Sci. Technol., 49, 831–838, https://doi.org/10.1021/es504567q, 2015.
Chow, J. C., Watson, J. G., Kuhns, H., Etyemezian, V., Lowenthal, D. H.,
Crow, D., Kohl, S. D., Engelbrecht, J. P., and Green, M. C.: Source profiles
for industrial, mobile, and area sources in the Big Bend Regional Aerosol
Visibility and Observational study, Chemosphere, 54, 185–208,
https://doi.org/10.1016/j.chemosphere.2003.07.004, 2004.
Chow, J. C., Lowenthal, D. H., Chen, L. W. A., Wang, X. L., and Watson, J.
G.: Mass reconstruction methods for PM2.5: a review, Air Qual. Atmos.
Hlth., 8, 243–263, https://doi.org/10.1007/s11869-015-0338-3, 2015.
CNEMC (China National Environmental Monitoring Centre): Background values of soil elements in China, edited by: Wu, S. D., Chinese Environmental Press, Beijing, ISBN 7-80010-772-8/X⋅417, 1990 (in Chinese).
Crippa, M., DeCarlo, P. F., Slowik, J. G., Mohr, C., Heringa, M. F., Chirico, R., Poulain, L., Freutel, F., Sciare, J., Cozic, J., Di Marco, C. F., Elsasser, M., Nicolas, J. B., Marchand, N., Abidi, E., Wiedensohler, A., Drewnick, F., Schneider, J., Borrmann, S., Nemitz, E., Zimmermann, R., Jaffrezo, J.-L., Prévôt, A. S. H., and Baltensperger, U.: Wintertime aerosol chemical composition and source apportionment of the organic fraction in the metropolitan area of Paris, Atmos. Chem. Phys., 13, 961–981, https://doi.org/10.5194/acp-13-961-2013, 2013.
Cubison, M. J., Ortega, A. M., Hayes, P. L., Farmer, D. K., Day, D., Lechner, M. J., Brune, W. H., Apel, E., Diskin, G. S., Fisher, J. A., Fuelberg, H. E., Hecobian, A., Knapp, D. J., Mikoviny, T., Riemer, D., Sachse, G. W., Sessions, W., Weber, R. J., Weinheimer, A. J., Wisthaler, A., and Jimenez, J. L.: Effects of aging on organic aerosol from open biomass burning smoke in aircraft and laboratory studies, Atmos. Chem. Phys., 11, 12049–12064, https://doi.org/10.5194/acp-11-12049-2011, 2011.
Deng, J. J., Zhang, Y. R., Hong, Y. W., Xu, L. L., Chen, Y. T., Du, W. J.,
and Chen, J. S.: Optical properties of PM2.5 and the impacts of
chemical compositions in the coastal city Xiamen in China, Sci. Total
Environ., 557–558, 665–675,
https://doi.org/10.1016/j.scitotenv.2016.03.143, 2016.
Drinovec, L., Močnik, G., Zotter, P., Prévôt, A. S. H., Ruckstuhl, C., Coz, E., Rupakheti, M., Sciare, J., Müller, T., Wiedensohler, A., and Hansen, A. D. A.: The “dual-spot” Aethalometer: an improved measurement of aerosol black carbon with real-time loading compensation, Atmos. Meas. Tech., 8, 1965–1979, https://doi.org/10.5194/amt-8-1965-2015, 2015.
Feng, Y., Ramanathan, V., and Kotamarthi, V. R.: Brown carbon: a significant atmospheric absorber of solar radiation?, Atmos. Chem. Phys., 13, 8607–8621, https://doi.org/10.5194/acp-13-8607-2013, 2013.
Forello, A. C., Bernardoni, V., Calzolai, G., Lucarelli, F., Massabò, D., Nava, S., Pileci, R. E., Prati, P., Valentini, S., Valli, G., and Vecchi, R.: Exploiting multi-wavelength aerosol absorption coefficients in a multi-time resolution source apportionment study to retrieve source-dependent absorption parameters, Atmos. Chem. Phys., 19, 11235–11252, https://doi.org/10.5194/acp-19-11235-2019, 2019.
Furger, M., Rai, P., Slowik, J. G., Cao, J. J., Visser, S., Baltensperger,
U., and Prévôt, A. S. H.: Automated alternating sampling of
PM10 and PM2.5 with an online XRF spectrometer, Atmos. Environ.
X, 5, 100065, https://doi.org/10.1016/j.aeaoa.2020.100065, 2020.
Geivanidis, S., Pistikopoulos, P., and Samaras, Z.: Effect on exhaust
emissions by the use of methylcyclopentadienyl manganese tricarbonyl (MMT)
fuel additive and other lead replacement gasolines, Sci. Total Environ.,
305, 129–141, https://doi.org/10.1016/S0048-9697(02)00476-X, 2003.
Hallquist, M., Wenger, J. C., Baltensperger, U., Rudich, Y., Simpson, D., Claeys, M., Dommen, J., Donahue, N. M., George, C., Goldstein, A. H., Hamilton, J. F., Herrmann, H., Hoffmann, T., Iinuma, Y., Jang, M., Jenkin, M. E., Jimenez, J. L., Kiendler-Scharr, A., Maenhaut, W., McFiggans, G., Mentel, Th. F., Monod, A., Prévôt, A. S. H., Seinfeld, J. H., Surratt, J. D., Szmigielski, R., and Wildt, J.: The formation, properties and impact of secondary organic aerosol: current and emerging issues, Atmos. Chem. Phys., 9, 5155–5236, https://doi.org/10.5194/acp-9-5155-2009, 2009.
Han, T. T., Xu, W. Q., Chen, C., Liu, X. G., Wang, Q. Q., Li, J., Zhao, X.
J., Du, W., Wang, Z. F., and Sun, Y. L.: Chemical apportionment of aerosol
optical properties during the Asia-Pacific Economic Cooperation summit in
Beijing, China, J. Geophys. Res.-Atmos., 120, 12281–12295,
https://doi.org/10.1002/2015JD023918, 2015.
Herich, H., Hueglin, C., and Buchmann, B.: A 2.5 year's source apportionment
study of black carbon from wood burning and fossil fuel combustion at urban
and rural sites in Switzerland, Atmos. Meas. Tech., 4, 1409–1420,
https://doi.org/10.5194/amt-4-1409-2011, 2011.
Hess, M., Koepke, P., and Schult, I.: Optical properties of aerosols and
clouds: The software package OPAC, B. Am. Meteorol. Soc., 79, 831–844,
https://doi.org/10.1175/1520-0477(1998)079<0831:OPOAAC>2.0.CO;2, 1998.
Hu, W., Hu, M., Hu, W.-W., Zheng, J., Chen, C., Wu, Y., and Guo, S.: Seasonal variations in high time-resolved chemical compositions, sources, and evolution of atmospheric submicron aerosols in the megacity Beijing, Atmos. Chem. Phys., 17, 9979–10000, https://doi.org/10.5194/acp-17-9979-2017, 2017.
Hu, W. W., Hu, M., Hu, W., Jimenez, J. L., Yuan, B., Chen, W. T., Wang, M.,
Wu, Y. S., Chen, C., Wang, Z. B., Peng, J. F., Zeng, L. M., and Shao, M.:
Chemical composition, sources, and aging process of submicron aerosols in
Beijing: Contrast between summer and winter, J. Geophys. Res.-Atmos., 121,
1955–1977, https://doi.org/10.1002/2015JD024020, 2016.
Huang, X., Liu, Z., Liu, J., Hu, B., Wen, T., Tang, G., Zhang, J., Wu, F., Ji, D., Wang, L., and Wang, Y.: Chemical characterization and source identification of PM2.5 at multiple sites in the Beijing–Tianjin–Hebei region, China, Atmos. Chem. Phys., 17, 12941–12962, https://doi.org/10.5194/acp-17-12941-2017, 2017.
Huang, X., Ding, A. J., Gao, J., Zheng, B., Zhou, D. R., Qi, X. M., Tang,
R., Wang, J. P., Ren, C. H., Nie, W., Chi, X. G., Xu, Z., Chen, L. D., Li,
Y. Y., Che, F., Pang, N. N., Wang, H. K., Tong, D., Qin, W., Cheng, W., Liu,
W. J., Fu, Q. Y., Liu, B. X., Chai, F., Davis, J. S., Zhang, Q., and He, K.
B.: Enhanced secondary pollution offset reduction of primary emissions
during COVID-19 lockdown in China, Natl. Sci. Rev., 8, nwaa137,
https://doi.org/10.1093/nsr/nwaa137, 2020.
Huang, X.-F., Zou, B.-B., He, L.-Y., Hu, M., Prévôt, A. S. H., and Zhang, Y.-H.: Exploration of PM2.5 sources on the regional scale in the Pearl River Delta based on ME-2 modeling, Atmos. Chem. Phys., 18, 11563–11580, https://doi.org/10.5194/acp-18-11563-2018, 2018.
Ibrahim, S., Landa, M., Pešek, O., Pavelka, K., and Halounova, L.:
Space-time machine learning models to analyze COVID-19 pandemic lockdown
effects on aerosol optical depth over Europe, Remote Sens., 13, 3027,
https://doi.org/10.3390/rs13153027, 2021.
IPCC: Climate change 2013: The physical science basis. Contribution of working group I to the fifth assessment report of the intergovernmental panel on climate change, edited by: Stocker, T. F., Qin, D., Plattner, G.-K., Tignor, M., Allen, S. K., Boschung, J., Nauels, A., Xia, Y., Bex, V., and Midgley, P. M., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 1535 pp., ISBN 978-1-107-66182-0, 2013.
Khan, J. Z., Sun, L., Tian, Y. Z., Shi, G. L., and Feng, Y. C.: Chemical
characterization and source apportionment of PM1 and PM2.5 in
Tianjin, China: Impacts of biomass burning and primary biogenic sources, J.
Environ. Sci., 99, 196–209, https://doi.org/10.1016/j.jes.2020.06.027,
2021.
Kim, H., Zhang, Q., Bae, G.-N., Kim, J. Y., and Lee, S. B.: Sources and atmospheric processing of winter aerosols in Seoul, Korea: insights from real-time measurements using a high-resolution aerosol mass spectrometer, Atmos. Chem. Phys., 17, 2009–2033, https://doi.org/10.5194/acp-17-2009-2017, 2017.
Kirchstetter, T. W., Novakov, T., and Hobbs, P. V.: Evidence that the
spectral dependence of light absorption by aerosols is affected by organic
carbon, J. Geophys. Res.-Atmos., 109, D21208, https://doi.org/10.1029/2004JD004999,
2004.
Kumar, D., Singh, A. K., Kumar, V., Poyoja, R., Ghosh, A., and Singh, B.:
COVID-19 driven changes in the air quality; a study of major cities in the
Indian state of Uttar Pradesh, Environ. Pollut., 274, 116512,
https://doi.org/10.1016/j.envpol.2021.116512, 2021.
Laskin, A., Laskin, J., and Nizkorodov, S. A.: Chemistry of atmospheric
brown carbon, Chem. Rev., 115, 10, 4335–4382,
https://doi.org/10.1021/cr5006167, 2015.
Le, T. H., Wang, Y., Liu, L., Yang, J. N., Yung, Y., Li, G. H., and
Seinfeld, J. H.: Unexpected air pollution with marked emission reductions
during the COVID-19 outbreak in China, Science, 369, 702–706,
https://doi.org/10.1126/science.abb7431, 2020.
Lee, H. J., Aiona, P. K., Laskin, A., Laskin, J., and Nizkorodov, S. A.:
Effect of solar radiation on the optical properties and molecular
composition of laboratory proxies of atmospheric brown carbon, Environ. Sci.
Technol., 48, 10217–10226, https://doi.org/10.1021/es502515r, 2014.
Li, H., Zhang, Q., Zhang, Q., Chen, C., Wang, L., Wei, Z., Zhou, S., Parworth, C., Zheng, B., Canonaco, F., Prévôt, A. S. H., Chen, P., Zhang, H., Wallington, T. J., and He, K.: Wintertime aerosol chemistry and haze evolution in an extremely polluted city of the North China Plain: significant contribution from coal and biomass combustion, Atmos. Chem. Phys., 17, 4751–4768, https://doi.org/10.5194/acp-17-4751-2017, 2017.
Li, L., Li, Q., Huang, L., Wang, Q., Zhu, A. S., Xu, J., Liu, Z. Y., Li, H.
L., Shi, L. S., Li, R., Azari, M., Wang, Y. J., Zhang, X. J., Liu, Z. Q.,
Zhu, Y. H., Zhang, K., Xue, S. H., Ooi, M. C. G., Zhang, D. P., and Chan,
A.: Air quality changes during the COVID-19 lockdown over the Yangtze River
Delta Region: An insight into the impact of human activity pattern changes
on air pollution variation, Sci. Total Environ., 732, 139282,
https://doi.org/10.1016/j.scitotenv.2020.139282, 2020.
Li, L. L, Tan, Q. W., Zhang, Y. H., Feng, M., Qu, Y., An, J. L., and Liu, X.
G.: Characteristics and source apportionment of PM2.5 during persistent
extreme haze events in Chengdu, southwest China, Environ. Pollut., 230,
718–729, https://doi.org/10.1016/j.envpol.2017.07.029, 2017.
Li, X. H., Wang, S. X., Duan, L., Hao, J. M., Li, C., Chen, Y. S., and Yang,
L.: Particulate and trace gas emissions from open burning of wheat straw and
corn stover in China, Environ. Sci. Technol., 41, 6052–6058,
https://doi.org/10.1021/es0705137, 2007.
Lin, G. X., Penner, J. E., Flanner, M. G., Sillman, S., Xu, L., and Zhou,
C.: Radiative forcing of organic aerosol in the atmosphere and on snow:
Effects of SOA and brown carbon, J. Geophys. Res.-Atmos., 119, 7453–7476,
https://doi.org/10.1002/2013JD021186, 2014.
Lin, Y. C., Zhang, Y. L., Xie, F., Fan, M. Y., and Liu, X.: Substantial
decreases of light absorption, concentrations and relative contributions of
fossil fuel to light-absorbing carbonaceous aerosols attributed to the
COVID-19 lockdown in east China, Environ. Pollut., 275, 116615,
https://doi.org/10.1016/j.envpol.2021.116615, 2021.
Liu, B. S., Wu, J. H., Zhang, J. Y., Wang, L., Yang, J. M., Liang, D. N.,
Dai, Q. L., Bi, X. H., Feng, Y. C., Zhang, Y. F., and Zhang, Q. X.:
Characterization and source apportionment of PM2.5 based on error
estimation from EPA PMF 5.0 model at a medium city in China, Environ.
Pollut., 222, 10–22, https://doi.org/10.1016/j.envpol.2017.01.005, 2017.
Liu, D. T., Hu, K., Zhao, D. L., Ding, S., Wu, Y. F., Zhou, C., Yu, C. J.,
Tian, P., Liu, Q., Bi, K., Wu, Y. Z., Hu, B., Ji, D. S., Kong, S. F.,
Ouyang, B., He, H., Huang, M. Y., and Ding, D. P.: Efficient vertical
transport of black carbon in the planetary boundary layer, Geophys. Res.
Lett., 47, e2020GL088858, https://doi.org/10.1029/2020GL088858, 2020.
Ma, X., Yu, F., and Luo, G.: Aerosol direct radiative forcing based on GEOS-Chem-APM and uncertainties, Atmos. Chem. Phys., 12, 5563–5581, https://doi.org/10.5194/acp-12-5563-2012, 2012.
Malm, W. C. and Hand, J. L.: An examination of the physical and optical
properties of aerosols collected in the IMPROVE program, Atmos. Environ.,
41, 3407–3427, https://doi.org/10.1016/j.atmosenv.2006.12.012, 2007.
Moise, T., Flores, J. M., and Rudich, Y.: Optical properties of secondary
organic aerosols and their changes by chemical processes, Chem. Rev., 115,
4400–4439, https://doi.org/10.1021/cr5005259, 2015.
Ng, N. L., Herndon, S. C., Trimborn, A., Canagaratna, M. R., Croteau, P. L.,
Onasch, T. B., Sueper, D., Worsnop, D. R., Zhang, Q., Sun, Y. L., and Jayne,
J. T.: An aerosol chemical speciation monitor (ACSM) for routine monitoring
of the composition and mass concentrations of ambient aerosol, Aerosol Sci.
Tech., 45, 780–794, https://doi.org/10.1080/02786826.2011.560211, 2011.
Ni, H. Y., Tian, J., Wang, X. L., Wang, Q. Y., Han, Y. M., Cao, J. J., Long,
X., Chen, L.-W. A., Chow, J. C., and Watson, J. G.: PM2.5 emissions
and source profiles from open burning of crop residues, Atmos. Environ.,
169, 229–237, https://doi.org/10.1016/j.atmosenv.2017.08.063, 2017.
Niu, X. Y., Cao, J. J., Shen, Z. X., Ho, S. S. H., Tie, X. X., Zhao, S. Y.,
Xu, H. M., Zhang, T., and Huang, R. J.: PM2.5 from the Guanzhong
Plain: Chemical composition and implications for emission reductions, Atmos.
Environ., 147, 458–469, https://doi.org/10.1016/j.atmosenv.2016.10.029,
2016.
Norris, G., Duvall, R., Brown, S., and Bai, S.: EPA positive matrix
factorization (PMF) 5.0 fundamentals and user guide, U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-14/108 (NTIS PB 2015-105147), https://cfpub.epa.gov/si/si_public_record_report.cfm?Lab=NERL&direntryid=308292 (last access: 26 June 2022), 2014.
Qin, Y. M., Tan, H. B., Li, Y. J., Li, Z. J., Schurman, M. I., Liu, L., Wu, C., and Chan, C. K.: Chemical characteristics of brown carbon in atmospheric particles at a suburban site near Guangzhou, China, Atmos. Chem. Phys., 18, 16409–16418, https://doi.org/10.5194/acp-18-16409-2018, 2018.
Rai, P., Furger, M., Slowik, J. G., Canonaco, F., Fröhlich, R., Hüglin, C., Minguillón, M. C., Petterson, K., Baltensperger, U., and Prévôt, A. S. H.: Source apportionment of highly time-resolved elements during a firework episode from a rural freeway site in Switzerland, Atmos. Chem. Phys., 20, 1657–1674, https://doi.org/10.5194/acp-20-1657-2020, 2020.
Ricchiazzi, P., Yang, S. R., Gautier, C., and Sowle, D.: SBDART: A research
and teaching software tool for Plane-parallel radiative transfer in the
Earth's atmosphere, B. Am. Meteorol. Soc., 79, 2101–2114,
https://doi.org/10.1175/1520-0477(1998)079<2101:SARATS>2.0.CO;2, 1998.
Saarikoski, S., Niemi, J. V., Aurela, M., Pirjola, L., Kousa, A., Rönkkö, T., and Timonen, H.: Sources of black carbon at residential and traffic environments obtained by two source apportionment methods, Atmos. Chem. Phys., 21, 14851–14869, https://doi.org/10.5194/acp-21-14851-2021, 2021.
Sanap, S. D.: Global and regional variations in aerosol loading during
COVID-19 imposed lockdown, Atmos. Environ., 246, 118132,
https://doi.org/10.1016/j.atmosenv.2020.118132, 2021.
Sandradewi, J., Prévôt, A. S. H., Szidat, S., Perron, N., Alfarra,
M. R., Lanz, V. A., Weingartner, E., and Baltensperger, U.: Using aerosol
light absorption measurements for the quantitative determination of wood
burning and traffic emission contributions to particulate matter, Environ.
Sci. Technol., 42, 3316–3323, https://doi.org/10.1021/es702253m, 2008.
Schimek, M. G.: Semiparametric penalized generalized additive models for
environmental research and epidemiology, Environmetrics, 20, 699–717,
https://doi.org/10.1002/env.972, 2009.
Shen, G. F., Xue, M., Yuan, S. Y., Zhang, J., Zhao, Q. Y., Li, B., Wu, H.
S., and Ding, A. J.: Chemical compositions and reconstructed light
extinction coefficients of particulate matter in a mega-city in the western
Yangtze River Delta, China, Atmos. Environ., 83, 14–20,
https://doi.org/10.1016/j.atmosenv.2013.10.055, 2014.
Tan, J. H., Zhang, L. M., Zhou, X. M., Duan, J. C., Li, Y., Hu, J. N., and
He, K. B.: Chemical characteristics and source apportionment of PM2.5
in Lanzhou, China, Sci. Total Environ., 601–602, 1743–1752,
https://doi.org/10.1016/j.scitotenv.2017.06.050, 2017.
Tao, J., Zhang, L. M., Cao, J., Hsu, S. C., Xia, X. G., Zhang, Z. S., Lin,
Z. J., Cheng, T. T., and Zhang, R. J.: Characterization and source
apportionment of aerosol light extinction in Chengdu, southwest China,
Atmos. Environ., 95, 552–562,
https://doi.org/10.1016/j.atmosenv.2014.07.017, 2014.
Tao, J., Zhang, L. M., Gao, J., Wang, H., Chai, F. H., and Wang, S. L:
Aerosol chemical composition and light scattering during a winter season in
Beijing, Atmos. Environ., 110, 36–44,
https://doi.org/10.1016/j.atmosenv.2015.03.037, 2015.
Tao, J., Zhang, L. M., Cao, J. J., Zhong, L. J., Chen, D. S., Yang, Y. H.,
Chen, D. H., Chen, L. G., Zhang, Z. S., Wu, Y., Xia, Y. J., Ye, S. Q., and
Zhang, R. J.: Source apportionment of PM2.5 at urban and suburban areas
of the Pearl River Delta region, south China – With emphasis on ship
emissions, Sci. Total Environ., 574, 1559–1570,
https://doi.org/10.1016/j.scitotenv.2016.08.175, 2017.
Tian, H. Z., Lu, L., Hao, J. M., Gao, J. J., Cheng, K., Liu, K. Y., Qiu, P.
P., and Zhu, C. Y.: A review of key hazardous trace elements in Chinese
coals: Abundance, occurrence, behavior during coal combustion and their
environmental impacts, Energ. Fuel., 27, 601–614,
https://doi.org/10.1021/ef3017305, 2013.
Tian, J., Wang, Q. Y., Ni, H. Y., Wang, M., Zhou, Y. Q., Han, Y. M., Shen,
Z. X., Pongpiachan, S., Zhang, N. N., Zhao, Z. Z., Zhang, Q., Zhang, Y.,
Long, X., and Cao, J. J.: Emission characteristics of primary brown carbon
absorption from biomass and coal burning: Development of an optical emission
inventory for China, J. Geophys. Res.-Atmos., 124, 1879–1893,
https://doi.org/10.1029/2018JD029352, 2019.
Tian, J., Wang, Q. Y., Han, Y. M., Ye, J. H., Wang, P., Pongpiachan, S., Ni,
H. Y., Zhou, Y. Q., Wang, M., Zhao, Y. Z., and Cao, J. J.: Contributions of
aerosol composition and sources to particulate optical properties in a
southern coastal city of China, Atmos. Res., 235, 104744, doi10.1016/j.atmosres.2019.104744, 2020.
Tian, J., Wang, Q. Y., Zhang, Y., Yan, M. Y., Liu, H. K., Zhang, N. N., Ran,
W. K., and Cao, J. J.: Impacts of primary emissions and secondary aerosol
formation on air pollution in an urban area of China during the COVID-19
lockdown, Environ. Int., 150, 106426,
https://doi.org/10.1016/j.envint.2021.106426, 2021.
Tian, J., Wang, Q., Liu, H., Ma, Y., Liu, S., Zhang, Y., Ran, W., Han, Y., and Cao, J.: Data for “Measurement report: The importance of biomass burning in light extinction and direct radiative effect of urban aerosol during the COVID-19 lockdown in Xi'an, China”, Zenodo [data set], https://doi.org/10.5281/zenodo.6457841, 2022.
Ulbrich, I. M., Canagaratna, M. R., Zhang, Q., Worsnop, D. R., and Jimenez, J. L.: Interpretation of organic components from Positive Matrix Factorization of aerosol mass spectrometric data, Atmos. Chem. Phys., 9, 2891–2918, https://doi.org/10.5194/acp-9-2891-2009, 2009.
Wang, J. F., Ye, J. H., Zhang, Q., Zhao, J., Wu, Y. Z., Li, J. Y., Liu, D.
T., Li, W. J., Zhang, Y. G., Wu, C., Xie, C. H., Qin, Y. M., Lei, Y. L.,
Huang, X. P., Guo, J. P., Liu, P. F., Fu, P. Q., Li, Y. J., Lee, H. C.,
Choi, H., Zhang, J., Liao, H., Chen, M. D., Sun, Y. L., Ge, X. L., Martin,
S. T., and Jacob, D. J.: Aqueous production of secondary organic aerosol
from fossil-fuel emissions in winter Beijing haze, P. Natl. Acad. Sci. USA,
118, e2022179118, https://doi.org/10.1073/pnas.2022179118, 2021.
Wang, P., Cao, J. J., Shen, Z. X., Han, Y. M., Lee, S. C., Huang, Y., Zhu,
C. S., Wang, Q. Y., Xu, H. M., and Huang, R. J.: Spatial and seasonal
variations of PM2.5 mass and species during 2010 in Xi'an, China, Sci.
Total Environ., 508, 477–487,
https://doi.org/10.1016/j.scitotenv.2014.11.007, 2015.
Wang, P. F., Chen, K. Y., Zhu, S. Q., Wang, P., and Zhang, H. L.: Severe air
pollution events not avoided by reduced anthropogenic activities during
COVID-19 outbreak, Resour. Conserv. Recy., 158, 104814,
https://doi.org/10.1016/j.resconrec.2020.104814, 2020.
Wang, Q., Liu, H., Wang, P., Dai, W., Zhang, T., Zhao, Y., Tian, J., Zhang, W., Han, Y., and Cao, J.: Optical source apportionment and radiative effect of light-absorbing carbonaceous aerosols in a tropical marine monsoon climate zone: the importance of ship emissions, Atmos. Chem. Phys., 20, 15537–15549, https://doi.org/10.5194/acp-20-15537-2020, 2020.
Wang, X., Heald, C. L., Ridley, D. A., Schwarz, J. P., Spackman, J. R., Perring, A. E., Coe, H., Liu, D., and Clarke, A. D.: Exploiting simultaneous observational constraints on mass and absorption to estimate the global direct radiative forcing of black carbon and brown carbon, Atmos. Chem. Phys., 14, 10989–11010, https://doi.org/10.5194/acp-14-10989-2014, 2014.
Wang, Y. C., Yuan, Y., Wang, Q. Y., Liu, C. G., Zhi, Q., and Cao, J. J.:
Changes in air quality related to the control of coronavirus in China:
Implications for traffic and industrial emissions, Sci. Total Environ., 731,
139133, https://doi.org/10.1016/j.scitotenv.2020.139133, 2020.
Weber, J., Shin, Y. M., Staunton Sykes, J., Archer-Nicholls, S., Abraham, N.
L., and Archibald, A. T.: Minimal climate impacts from short-lived climate
forcers following emission reductions related to the COVID-19 pandemic,
Geophys. Res. Lett., 47, e2020GL090326.
https://doi.org/10.1029/2020GL090326, 2020.
Wood, S. N.: Stable and efficient multiple smoothing parameter estimation for
generalized additive models, J. Am. Stat. Assoc., 99, 673–686,
https://doi.org/10.1198/016214504000000980, 2004.
Wood, S. N.: Generalized additive models: An introduction with R (second edition), edited by: Blitzstein, J. K., Faraway, J. J., Tanner, M., and Zidek, J., CRC press, 496 pp., https://doi.org/10.1201/9781315370279, 2017.
Wu, J., Bei, N., Li, X., Cao, J., Feng, T., Wang, Y., Tie, X., and Li, G.: Widespread air pollutants of the North China Plain during the Asian summer monsoon season: a case study, Atmos. Chem. Phys., 18, 8491–8504, https://doi.org/10.5194/acp-18-8491-2018, 2018.
Xie, M. J., Chen, X., Holder, A. L., Hays, M. D., Lewandowski, M.,
Offenberg, J. H., Kleindienst, T. E., Jaoui, M., and Hannigan, M. P.: Light
absorption of organic carbon and its sources at a southeastern U.S. location
in summer, Environ. Pollut., 244, 38–46,
https://doi.org/10.1016/j.envpol.2018.09.125, 2019.
Xu, H. M., Cao, J. J., Ho, K. F., Ding, H., Han, Y. M., Wang, G. H., Chow,
J. C., Watson, J. G., Khol, S. D., Qiang, J., and Li, W. T.: Lead concentrations
in fine particulate matter after the phasing out of leaded gasoline in
Xi'an, China, Atmos. Environ., 46, 217–224,
https://doi.org/10.1016/j.atmosenv.2011.09.078, 2012.
Xu, L., Zhang, J., Sun, X., Xu, S. C., Shan, M., Yuan, Q., Liu, L., Du, Z.
H., Liu, D. T., Xu, D., Song, C. B., Liu, B. W., Lu, G. D., Shi, Z. B., and
Li, W. J.: Variation in concentration and sources of black carbon in a
megacity of China during the COVID-19 pandemic, Geophys. Res. Lett., 47,
e2020GL090444, https://doi.org/10.1029/2020GL090444, 2020.
Xu, W. Q., Sun, Y. L., Chen, C., Du, W., Han, T. T., Wang, Q. Q., Fu, P. Q., Wang, Z. F., Zhao, X. J., Zhou, L. B., Ji, D. S., Wang, P. C., and Worsnop, D. R.: Aerosol composition, oxidation properties, and sources in Beijing: results from the 2014 Asia-Pacific Economic Cooperation summit study, Atmos. Chem. Phys., 15, 13681–13698, https://doi.org/10.5194/acp-15-13681-2015, 2015.
Xu, W. Y., Kuang, Y., Bian, Y. X., Liu, L., Li, F., Wang, Y. Q., Xue, B.,
Luo, B., Huang, S., Yuan, B., Zhao, P. S., and Shao, M.: Current challenges
in visibility improvement in southern China, Environ. Sci. Tech. Let.,
7, 395–401, https://doi.org/10.1021/acs.estlett.0c00274, 2020.
Yao, H., Song, Y., Liu, M., Archer-Nicholls, S., Lowe, D., McFiggans, G., Xu, T., Du, P., Li, J., Wu, Y., Hu, M., Zhao, C., and Zhu, T.: Direct radiative effect of carbonaceous aerosols from crop residue burning during the summer harvest season in East China, Atmos. Chem. Phys., 17, 5205–5219, https://doi.org/10.5194/acp-17-5205-2017, 2017.
Yao, L. Q., Kong, S. F., Zheng, H., Chen, N., Zhu, B., Xu, K., Cao, W. X.,
Zhang, Y., Zheng, M. M., Cheng, Y., Hu, Y., Zhang, Z. X., Yan, Y. Y., Liu,
D. T., Zhao, T. L., Bai, Y. Q., and Qi, S. H.: Co-benefits of reducing
PM2.5 and improving visibility by COVID-19 lockdown in Wuhan, NPJ Clim.
Atmos. Sci., 4, 40, https://doi.org/10.1038/s41612-021-00195-6, 2021.
Yao, M. S., Zhang, L., Ma, J. X., and Zhou, L.: On airborne transmission and
control of SARS-Cov-2, Sci. Total Environ., 731, 139178,
https://doi.org/10.1016/j.scitotenv.2020.139178, 2020.
Yu, Y. Y., He, S. Y., Wu, X. L., Zhang, C., Yao, Y., Liao, H., Wang, Q. G.,
and Xie, M. J.: PM2.5 elements at an urban site in Yangtze River Delta,
China: High time-resolved measurement and the application in source
apportionment, Environ. Pollut., 253, 1089–1099,
https://doi.org/10.1016/j.envpol.2019.07.096, 2019.
Zhang, R., Jing, J., Tao, J., Hsu, S.-C., Wang, G., Cao, J., Lee, C. S. L., Zhu, L., Chen, Z., Zhao, Y., and Shen, Z.: Chemical characterization and source apportionment of PM2.5 in Beijing: seasonal perspective, Atmos. Chem. Phys., 13, 7053–7074, https://doi.org/10.5194/acp-13-7053-2013, 2013.
Zhang, R. Y., Wang, G. H., Guo, S., Zamora, M. L., Ying, Q., Lin, Y., Wang,
W. G., Hu, M., and Wang, Y.: Formation of urban fine particulate matter,
Chem. Rev., 115, 3803–3855, https://doi.org/10.1021/acs.chemrev.5b00067,
2015.
Zhang, Q., Shen, Z. X., Zhang, L. M., Zeng, Y. L., Ning, Z., Zhang, T., Lei,
Y. L., Wang, Q. Y., Li, G. H., Sun, J., Westerdahl, D., Xu, H. M., and Cao,
J. J.: Investigation of primary and secondary particulate brown carbon in
two Chinese cities of Xi'an and Hong Kong in wintertime, Environ. Sci.
Technol., 54, 3803–3813, https://doi.org/10.1021/acs.est.9b05332, 2020.
Zhang, Y. M., Sun, J. Y., Zhang, X. Y., Shen, X. J., Wang, T. T., and Qin,
M. K.: Seasonal characterization of components and size distributions for
submicron aerosols in Beijing, Sci. China-Earth Sci., 56, 890–900,
https://doi.org/10.1007/s11430-012-4515-z, 2013.
Zhao, P. S., Feng, Y. C., Tan, Z., and Wu, J. H.: Characterizations of
resuspended dust in six cities of North China, Atmos. Environ., 40,
5807–5814, https://doi.org/10.1016/j.atmosenv.2006.05.026, 2006.
Zhao, Y. B., Zhang, K., Xu, X. T., Shen, H. Z., Zhu, X., Zhang, Y. X., Hu,
Y. T., and Shen, G. F.: Substantial changes in nitrogen dioxide and ozone
after excluding meteorological impacts during the COVID-19 outbreak in
mainland China, Environ. Sci. Tech. Let., 7, 402–408,
https://doi.org/10.1021/acs.estlett.0c00304, 2020.
Zheng, B., Huo, H., Zhang, Q., Yao, Z. L., Wang, X. T., Yang, X. F., Liu, H., and He, K. B.: High-resolution mapping of vehicle emissions in China in 2008, Atmos. Chem. Phys., 14, 9787–9805, https://doi.org/10.5194/acp-14-9787-2014, 2014.
Zheng, B., Tong, D., Li, M., Liu, F., Hong, C., Geng, G., Li, H., Li, X., Peng, L., Qi, J., Yan, L., Zhang, Y., Zhao, H., Zheng, Y., He, K., and Zhang, Q.: Trends in China's anthropogenic emissions since 2010 as the consequence of clean air actions, Atmos. Chem. Phys., 18, 14095–14111, https://doi.org/10.5194/acp-18-14095-2018, 2018.
Zheng, H., Kong, S. F., Chen, N., Yan, Y. Y., Liu, D. T., Zhu, B., Xu, K.,
Cao, W. X., Ding, Q. Q., Lan, B., Zhang, Z. X., Zheng, M. M., Fan, Z. W.,
Cheng, Y., Zheng, S. R., Yao, L. Q., Bai, Y. Q., Zhao, T. L., and Qi, S. H.:
Significant changes in the chemical compositions and sources of PM2.5
in Wuhan since the city lockdown as COVID-19. Sci. Total Environ., 739,
140000, https://doi.org/10.1016/j.scitotenv.2020.140000, 2020.
Zhou, Y. Q., Wang, Q. Y., Huang, R. J., Liu, S. X., Tie, X. X., Su, X. L.,
Niu, X. Y., Zhao, Z. Z., Ni, H. Y., Wang, M., Zhang, Y. G., and Cao, J. J.:
Optical properties of aerosols and implications for radiative effects in
Beijing during the Asia-Pacific Economic Cooperation (APEC) Summit 2014, J.
Geophys. Res.-Atmos., 122, 10119–10132,
https://doi.org/10.1002/2017jd026997, 2017.
Zhu, W. F., Zhou, M., Cheng, Z., Yan, N. Q., Huang, C., Qiao, L. P., Wang,
H. L., Liu, Y, C., Lou, S. R., and Guo, S.: Seasonal variation of aerosol
compositions in Shanghai, China: Insights from particle aerosol mass
spectrometer observations, Sci. Total Environ., 771, 144948,
https://doi.org/10.1016/j.scitotenv.2021.144948, 2021.
Zotter, P., Herich, H., Gysel, M., El-Haddad, I., Zhang, Y., Močnik, G., Hüglin, C., Baltensperger, U., Szidat, S., and Prévôt, A. S. H.: Evaluation of the absorption Ångström exponents for traffic and wood burning in the Aethalometer-based source apportionment using radiocarbon measurements of ambient aerosol, Atmos. Chem. Phys., 17, 4229–4249, https://doi.org/10.5194/acp-17-4229-2017, 2017.
Short summary
We investigated aerosol optical properties and the direct radiative effect (DRE) at an urban site in China before and during the COVID-19 lockdown. The total light extinction coefficient (bext) decreased under emission control measures; however, bext from biomass burning increased due to the undiminished need for residential cooking and heating. Biomass burning, rather than traffic-related emissions, became the largest positive effect contributor to aerosol DRE in the lockdown.
We investigated aerosol optical properties and the direct radiative effect (DRE) at an urban...
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