Measurement report: Optical and structural properties of atmospheric water-soluble organic carbon in China – insights from multi-site spectroscopic measurements DOI Creative Commons
Haibiao Chen, Caiqing Yan,

Liubin Huang

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(6), P. 3647 - 3667

Published: March 27, 2025

Abstract. To understand the spatial variation of optical and structural properties water-soluble brown carbon its influencing factors in China, light absorption, fluorescence, Fourier transform infrared (FTIR) spectrum organic (WSOC) different regions China are measured following same analytical methods. The average absorption coefficients mass efficiencies WSOC at 365 nm (Abs365 MAE365) rank from high to low as northwest > southwest north east regional site, with higher values northern than southern sites inland areas coastal areas. resolved by spectra-based positive matrix factorization model abundance aromatic O−H C=C functional groups determined FTIR both indicate that compounds significant light-absorbing substances have a impact on fluorophores. Multiple linear regression analysis shows fluorophores identified fluorescence spectra combined parallel factor (PARAFAC) contribute about 62 %–93 % all sites, which humic-like substance (HULIS) contributes most, especially highly oxygenated HULIS (29 %–50 %) long emission wavelengths. Combustion source emissions atmospheric chemical processes impacts some sites. Moreover, relative humidity (RH) can also affect MAE365 WSOC, decreasing increase RH when RH<60 remaining relatively unchanged RH>60 %. Taken together, this study promotes better understanding heterogeneity their China.

Language: Английский

Measurement report: Optical and structural properties of atmospheric water-soluble organic carbon in China – insights from multi-site spectroscopic measurements DOI Creative Commons
Haibiao Chen, Caiqing Yan,

Liubin Huang

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(6), P. 3647 - 3667

Published: March 27, 2025

Abstract. To understand the spatial variation of optical and structural properties water-soluble brown carbon its influencing factors in China, light absorption, fluorescence, Fourier transform infrared (FTIR) spectrum organic (WSOC) different regions China are measured following same analytical methods. The average absorption coefficients mass efficiencies WSOC at 365 nm (Abs365 MAE365) rank from high to low as northwest > southwest north east regional site, with higher values northern than southern sites inland areas coastal areas. resolved by spectra-based positive matrix factorization model abundance aromatic O−H C=C functional groups determined FTIR both indicate that compounds significant light-absorbing substances have a impact on fluorophores. Multiple linear regression analysis shows fluorophores identified fluorescence spectra combined parallel factor (PARAFAC) contribute about 62 %–93 % all sites, which humic-like substance (HULIS) contributes most, especially highly oxygenated HULIS (29 %–50 %) long emission wavelengths. Combustion source emissions atmospheric chemical processes impacts some sites. Moreover, relative humidity (RH) can also affect MAE365 WSOC, decreasing increase RH when RH<60 remaining relatively unchanged RH>60 %. Taken together, this study promotes better understanding heterogeneity their China.

Language: Английский

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