Atomoschem at 06:56, 8 October 2023

2023-10-08T06:56:03Z

Atmoschem: Created page with "'''Abstract |''' We calculated the organic matter to organic carbon mass ratios (OM/OC mass ratios) in PM2.5 collected from 14 Chinese cities during summer and winter of 2003 ..."

2014-05-06T01:35:07Z

Created page with "'''Abstract |''' We calculated the organic matter to organic carbon mass ratios (OM/OC mass ratios) in PM2.5 collected from 14 Chinese cities during summer and winter of 2003 ..."

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'''Abstract |''' We calculated the organic matter to organic carbon
mass ratios (OM/OC mass ratios) in PM2.5 collected from 14
Chinese cities during summer and winter of 2003 and analyzed
the causes for their seasonal and spatial variability. The
OM/OC mass ratios were calculated two ways. Using a mass
balance method, the calculated OM/OC mass ratios averaged
1.92±0.39 year-round, with no significant seasonal or spatial
variation. The second calculation was based on chemical
species analyses of the organic compounds extracted from
the PM2.5 samples using dichloromethane/methanol and water.
The calculated OM/OC mass ratio in summer was relatively
high (1.75±0.13) and spatially-invariant due to vigorous
photochemistry and secondary organic aerosol (OA) production
throughout the country. The calculated OM/OC mass
ratio in winter (1.59±0.18) was significantly lower than that
in summer, with lower values in northern cities (1.51±0.07)
than in southern cities (1.65±0.15). This likely reflects the
wider usage of coal for heating purposes in northern China
in winter, in contrast to the larger contributions from biofuel
and biomass burning in southern China in winter. On average,
organic matter constituted 36 % and 34 % of Chinese
urban PM2.5 mass in summer and winter, respectively. We
report, for the first time, a high regional correlation between
Zn and oxalic acid in Chinese urban aerosols in summer. This
is consistent with the formation of stable Zn oxalate complex
in the aerosol phase previously proposed by Furukawa and
Takahashi (2011). We found that many other dicarboxylic
acids were also highly correlated with Zn in the summer Chinese
urban aerosol samples, suggesting that they may also
form stable organic complexes with Zn. Such formation may
have profound implications for the atmospheric abundance
and hygroscopic properties of aerosol dicarboxylic acids.

'''Publication |''' '''Xing, L.''', '''T.-M. Fu*''', J.J. Cao, S.C. Lee, G.H. Wang, K.-F. Ho, M.-C. Cheng, C.-F. You, and T.J. Wang (2013), Seasonal and spatial variability of the OM/OC mass ratios and high regional correlation between oxalic acid and zinc in Chinese urban organic aerosols, ''Atmos. Chem. Phys.'', 13, 4307-4318, doi:10.5194/acp-13-4307-2013. [http://162.105.245.3/~tmfu/web/papers/Xing_et_al_2013.pdf PDF]

← Older revision		Revision as of 06:56, 8 October 2023
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	and hygroscopic properties of aerosol dicarboxylic acids.		and hygroscopic properties of aerosol dicarboxylic acids.

−	'''Publication \|''' '''Xing, L.''', '''T.-M. Fu*''', J.J. Cao, S.C. Lee, G.H. Wang, K.-F. Ho, M.-C. Cheng, C.-F. You, and T.J. Wang (2013), Seasonal and spatial variability of the OM/OC mass ratios and high regional correlation between oxalic acid and zinc in Chinese urban organic aerosols, ''Atmos. Chem. Phys.'', 13, 4307-4318, doi:10.5194/acp-13-4307-2013. [http://~~162~~.~~105~~.~~245.3/~tmfu/web~~/papers/~~Xing_et_al_2013~~.pdf PDF]	+	'''Publication \|''' '''Xing, L.''', '''T.-M. Fu*''', J.J. Cao, S.C. Lee, G.H. Wang, K.-F. Ho, M.-C. Cheng, C.-F. You, and T.J. Wang (2013), Seasonal and spatial variability of the OM/OC mass ratios and high regional correlation between oxalic acid and zinc in Chinese urban organic aerosols, ''Atmos. Chem. Phys.'', 13, 4307-4318, doi:10.5194/acp-13-4307-2013. [http://atmoschem.org.cn/papers/Xing_et_al_2013_Atmospheric_Chemistry_and_Physics.pdf PDF]

Papers:Xing et al 2013 - Revision history

Atomoschem at 06:56, 8 October 2023

Atmoschem: Created page with "'''Abstract |''' We calculated the organic matter to organic carbon mass ratios (OM/OC mass ratios) in PM2.5 collected from 14 Chinese cities during summer and winter of 2003 ..."