Comparison of Atmospheric Monocarboxylic and Dicarboxylic Acids in Xi’ an, China, for Source Apportionment of Organic Aerosols

Wu, Lingmin; Wei, Liulin; Wang, Gailing; Zhao, Jingchan

doi:10.1007/s11270-020-04675-y

Cited by 5 publications

(3 citation statements)

References 34 publications

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“…Photochemical processes and primary emissions make dif ferent contributions to organic acids according to species, spatial, and temporal variations. Wu et al [61] demonstrate that monocarboxylic acids mainly comes from primary emissions including coal combustion and vehicle exhaust, while the sec ondary photochemistry and aqueousphase oxidation are the major sources of dicarboxylic acids in Xi′an, China. On hazy days, pollutants released from vehicle exhaust and cooking accumulated under the conditions of temperature inversion and high humidity, and provided enough precursors for pho tooxidation to form a high abundance of dicarboxylic acids.…”

Section: Carboxylic Acidsmentioning

confidence: 99%

“…On hazy days, pollutants released from vehicle exhaust and cooking accumulated under the conditions of temperature inversion and high humidity, and provided enough precursors for pho tooxidation to form a high abundance of dicarboxylic acids. [61] Zhao et al [50] suggest that the organic acids at the ground level were greatly related to local traffic emissions, whereas the long distance transport followed by atmospheric photochemical aging contributed greater to dicarboxylic acids and related com pounds in the atmospheric boundary layer than the ground surface in urban Beijing. Hoque et al [62] demonstrated that atmospheric levels of watersoluble organic aerosols including dicarboxylic acids and related compounds in the eastern North Pacific are significantly dependent on primary productivity fol lowed by seatoair releases of isoprene and unsaturated fatty acids and the subsequent photochemical oxidation.…”

Section: Carboxylic Acidsmentioning

confidence: 99%

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Photochemical Degradation of Organic Matter in the Atmosphere

Liu

et al. 2021

Advanced Sustainable Systems

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Section: Carboxylic Acidsmentioning

confidence: 99%

Section: Carboxylic Acidsmentioning

confidence: 99%

Photochemical Degradation of Organic Matter in the Atmosphere

Liu

et al. 2021

Advanced Sustainable Systems

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“…Organic aerosols contain a substantial fraction of species exhibiting Brönsted acid character (Jacob, 1986;Millet et al, 2015;Keene and Galloway, 1984;Chebbi and Carlier, 1996;Chen et al, 2021b;Angelis et al, 2012;Mochizuki et al, 2016;Wu et al, 2020;Kawamura et al, 1985). The concentrations of acidic species in aqueous aerosols directly affect the aerosol pH by modifying the H + concentrations within the aerosol (Pye et al, 2020;Ault, 2020).…”

Section: Introductionmentioning

confidence: 99%

Impact of acidity and surface-modulated acid dissociation on cloud response to organic aerosol

Sengupta,

Zheng,

Prisle

2024

Atmos. Chem. Phys.

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Abstract. Acid dissociation of the organic aerosol fraction has the potential to impact cloud-activating properties by altering aqueous-phase H+ concentrations and water activity but is currently overlooked in most atmospheric aerosol models. We implemented a simple representation of organic acid dissociation in the aerosol–chemistry–climate box model ECHAM6.3–HAM2.3 and investigated the impact on aerosol-forming aqueous sulfur chemistry, cloud droplet number concentrations, and the shortwave radiative effect. Many atmospheric organic acids are also surface-active and may be strongly adsorbed at the surface of small aqueous droplets. The degree of dissociation has recently been observed for several atmospheric surface-active organics with Brönsted acid character to be significantly shifted in the surface, compared to the bulk aqueous solution. In addition to the well-known bulk acidity, we therefore introduced an empirical account of this surface-modulated dissociation to further explore the potential impact on aerosol climate effects. Malonic acid and decanoic acid were used as proxies for atmospheric organic aerosols of different surface-active and acid strengths. Both acids were found to yield sufficient hydrogen ion concentrations from dissociation in an aqueous droplet population to strongly influence aqueous aerosol sulfur chemistry, leading to enhanced cloud droplet number concentrations and a cooling shortwave radiative effect. Further considering the surface modulation of organic acid dissociation, the impact on cloud microphysics was smaller than according to the well-known bulk solution acidity but still significant. Our results show that organic aerosol acid dissociation can significantly influence predictions of aerosol and cloud droplet formation and aerosol–cloud–climate effects and that, even for a well-known bulk solution phenomenon such as acidity, it may be important to also consider the specific influence of surface effects when surface-active acids comprise a significant fraction of the total organic aerosol mass.

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