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(Created page with "'''Abstract |''' We used the GEOS-Chem model and its adjoint to quantify Chinese non-methane volatile organic compound (NMVOC) emissions for the year 2007, using the troposphe...")
 
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'''Abstract |''' We used the GEOS-Chem model and its adjoint to quantify Chinese non-methane volatile organic compound (NMVOC) emissions for the year 2007, using the tropospheric column concentrations of formaldehyde and glyoxal observed by the Global Ozone Monitoring Experiment 2A (GOME-2A) instrument and the Ozone Monitoring Instrument (OMI) as quantitative constraints. We conducted a series of inversion experiments using different combinations of satellite observations to explore their impacts on the top-down emission estimates. Our top-down estimates for Chinese annual total NMVOC emissions were 30.7 to 49.5 (average 41.9) Tgyr−1, including 16.4 to 23.6 (average 20.2) Tgyr−1 from anthropogenic sources, 12.2 to 22.8 (average 19.2) Tgyr−1 from biogenic sources, and 2.08 to 3.13 (average 2.48) Tgyr−1 from biomass burning. In comparison, the a priori estimate for Chinese annual total NMVOC emissions was 38.3Tgyr−1, including 18.8Tgyr−1 from anthropogenic sources, 17.3Tgyr−1 from biogenic sources, and 2.27Tgyr−1 from biomass burning. The simultaneous use of glyoxal and formaldehyde observations helped distinguish the NMVOC species from different sources and was essential in constraining anthropogenic emissions. Our four inversion experiments consistently showed that the Chinese anthropogenic emissions of NMVOC precursors of glyoxal were larger than the a priori estimates. Our top-down estimates for Chinese annual emission of anthropogenic aromatics (benzene, toluene, and xylene) ranged from 5.5 to 7.9Tgyr−1, 2% to 46% larger than the estimate of the a priori emission inventory (5.4Tgyr−1). Three out of our four inversion experiments indicated that the seasonal variation in Chinese NMVOC emissions was significantly stronger than indicated in the a priori inventory. Model simulations driven by the average of our top-down NMVOC emission estimates (which had a stronger seasonal variation than the a priori) showed that surface afternoon ozone concentrations over eastern China increased by 1–8ppb in June and decreased by 1–10ppb in December relative to the simulations using the a priori emissions and were in better agreement with measurements. We concluded that the satellite observations of formaldehyde and glyoxal together provided quantitative constraints on the emissions and source types of NMVOCs over China and improved our understanding on regional chemistry.
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'''Abstract |''' Levoglucosan has been widely used to quantitatively assess biomass burning’s contribution to ambient aerosols, but previous such assessments have not accounted for levoglucosan’s degradation in the atmosphere. We develop the first global simulation of atmospheric levoglucosan, explicitly accounting for its chemical degradation, to evaluate the impacts on levoglucosan’s use in quantitative aerosol source apportionment. Levoglucosan is emitted into the atmosphere from the burning of plant matter in open fires (1.7 Tg yr–1) and as biofuels (2.1 Tg yr–1). Sinks of atmospheric levoglucosan include aqueous-phase oxidation (2.9 Tg yr–1), heterogeneous oxidation (0.16 Tg yr–1), gas-phase oxidation (1.4 × 10–4 Tg yr–1), and dry and wet deposition (0.27 and 0.43 Tg yr –1). The global atmospheric burden of levoglucosan is 19 Gg with a lifetime of 1.8 days. Observations show a sharp decline in levoglucosan’s concentrations and its relative abundance to organic carbon aerosol (OC) and particulate K+ from near-source to remote sites. We show that such features can only be reproduced when levoglucosan’s chemical degradation is included in the model. Using model results, we develop statistical parametrizations to account for the atmospheric degradation in levoglucosan measurements, improving their use for quantitative aerosol source apportionment.
  
  
 
'''Publication |''' '''Li, Y.''', '''Fu, T.-M.*''', Yu, J. Z.*, '''Xu, F.''', '''Zhang, L.''', Chen, J., Boreddy, S. K. R., Kawamura, K., Fu, P., Yang, X., Zhu, L., Zeng, Z. (2021), Impacts of chemical degradation on the global budget of atmospheric levoglucosan and its use as a biomass burning tracer, ''Environmental Science & Technology'', 55(8), 5525-5536, doi:10.1021/acs.est.0c07313. [https://fugroup.org/papers/li_et_al_2021_Environmental_Science_and_Technology.pdf PDF ] [https://doi.org/10.1021/acs.est.0c07313 Full text].
 
'''Publication |''' '''Li, Y.''', '''Fu, T.-M.*''', Yu, J. Z.*, '''Xu, F.''', '''Zhang, L.''', Chen, J., Boreddy, S. K. R., Kawamura, K., Fu, P., Yang, X., Zhu, L., Zeng, Z. (2021), Impacts of chemical degradation on the global budget of atmospheric levoglucosan and its use as a biomass burning tracer, ''Environmental Science & Technology'', 55(8), 5525-5536, doi:10.1021/acs.est.0c07313. [https://fugroup.org/papers/li_et_al_2021_Environmental_Science_and_Technology.pdf PDF ] [https://doi.org/10.1021/acs.est.0c07313 Full text].

Revision as of 09:40, 8 June 2022

Abstract | Levoglucosan has been widely used to quantitatively assess biomass burning’s contribution to ambient aerosols, but previous such assessments have not accounted for levoglucosan’s degradation in the atmosphere. We develop the first global simulation of atmospheric levoglucosan, explicitly accounting for its chemical degradation, to evaluate the impacts on levoglucosan’s use in quantitative aerosol source apportionment. Levoglucosan is emitted into the atmosphere from the burning of plant matter in open fires (1.7 Tg yr–1) and as biofuels (2.1 Tg yr–1). Sinks of atmospheric levoglucosan include aqueous-phase oxidation (2.9 Tg yr–1), heterogeneous oxidation (0.16 Tg yr–1), gas-phase oxidation (1.4 × 10–4 Tg yr–1), and dry and wet deposition (0.27 and 0.43 Tg yr –1). The global atmospheric burden of levoglucosan is 19 Gg with a lifetime of 1.8 days. Observations show a sharp decline in levoglucosan’s concentrations and its relative abundance to organic carbon aerosol (OC) and particulate K+ from near-source to remote sites. We show that such features can only be reproduced when levoglucosan’s chemical degradation is included in the model. Using model results, we develop statistical parametrizations to account for the atmospheric degradation in levoglucosan measurements, improving their use for quantitative aerosol source apportionment.


Publication | Li, Y., Fu, T.-M.*, Yu, J. Z.*, Xu, F., Zhang, L., Chen, J., Boreddy, S. K. R., Kawamura, K., Fu, P., Yang, X., Zhu, L., Zeng, Z. (2021), Impacts of chemical degradation on the global budget of atmospheric levoglucosan and its use as a biomass burning tracer, Environmental Science & Technology, 55(8), 5525-5536, doi:10.1021/acs.est.0c07313. PDF Full text.

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