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Wintertime Diurnal Variation in Absorption Coefficient of Brown Carbon Associated with the Molecular Marker of Levoglucosan.
- Source :
- Applied Sciences (2076-3417); May2024, Vol. 14 Issue 10, p4117, 12p
- Publication Year :
- 2024
-
Abstract
- This study investigated the aerosol particle properties and light absorption properties of brown carbon (BrC) by utilizing a seven-wavelength aethalometer, and analyzed NH<subscript>4</subscript><superscript>+</superscript>, NO<subscript>3</subscript><superscript>−</superscript>, SO<subscript>4</subscript><superscript>2−</superscript>, K<superscript>+</superscript>, K, organic carbon, elemental carbon, levoglucosan, and mannosan in PM<subscript>2.5</subscript>. The research was conducted in a rural area of Jeonnam, South Korea, during the winter season. In addition, the dithiothreitol assay-oxidative potential normalized to 9,10-phenanthrenequinone (QDTT-OP) was investigated throughout the study period. The absorption coefficient was found to be 2.6 to 5.6 times higher at 370 nm compared to 880 nm, suggesting the presence of light-absorbing substances in addition to black carbon (BC) particles. The estimated absorption coefficient of BrC<subscript>370</subscript> was 29.9% of the total light absorption coefficient at 370 nm. Furthermore, BrC<subscript>370</subscript> exhibited a strong affinity with levoglucosan while showing a weak correlation with K<superscript>+</superscript>, confirming the suitability of levoglucosan as a tracer for biomass burning. The QDTT-OP was 5.3 nM m<superscript>−3</superscript>, and highly correlated with the carbonaceous components levoglucosan and mannosan, suggesting a relatively high contribution of biomass combustion emissions to oxidative potential. Further research should be conducted to assess the health risks associated with future PM<subscript>2.5</subscript> exposure related to biomass burning in the atmosphere. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20763417
- Volume :
- 14
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Applied Sciences (2076-3417)
- Publication Type :
- Academic Journal
- Accession number :
- 177458858
- Full Text :
- https://doi.org/10.3390/app14104117