the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Significant Seasonal Change in Optical Properties by atmospheric humic-like substances (HULIS) in Water-Soluble Organic Carbon Aerosols
Abstract. Atmospheric humic-like substance (HULIS) is an important fraction of water-soluble organic carbon (WSOC) accounting for the light-absorbing properties of organic aerosols. HULIS is responsible for light-absorbing properties of organic aerosols in the atmosphere. Although various sources of HULIS have been studied extensively, its sinks are poorly constrained. In this study, we found seasonal changes in the optical and chemical characteristics of HULIS and WSOC, which are decreased by approximately 80 % and 30 %, respectively, from the cold season (Oct–Jan) to the warm season (Jun–Sep) due to enhanced solar ultraviolet (UV) radiation. The dominant role of photochemical degradation on light-absorbing organic aerosols, as a sink of HULIS, was further confirmed based on a laboratory experiment by evaluating impact of UV radiation on the optical properties of HULIS and WSOC contents. Our results suggest that seasonal variation of HULIS in WSOC is resulted mainly by photo-induced degradation in the atmosphere. Thus, photochemical degradation of HULIS seems to play a critical role on seasonal variations in the light-absorbing properties of organic aerosols as well as the biogeochemical impact of WSOC on Earth’s surface.
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RC1: 'Comments', Anonymous Referee #1, 15 Aug 2017
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AC1: 'Reply to reviewer # 1', Guebuem Kim, 24 Aug 2017
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RC2: 'Follow up', Anonymous Referee #1, 28 Aug 2017
- AC2: 'Reply to reviewer # 1', Guebuem Kim, 18 Sep 2017
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RC2: 'Follow up', Anonymous Referee #1, 28 Aug 2017
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AC1: 'Reply to reviewer # 1', Guebuem Kim, 24 Aug 2017
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RC3: 'Review report', Anonymous Referee #2, 30 Aug 2017
- AC3: 'Reply to reviewer # 2', Guebuem Kim, 18 Sep 2017
-
RC1: 'Comments', Anonymous Referee #1, 15 Aug 2017
-
AC1: 'Reply to reviewer # 1', Guebuem Kim, 24 Aug 2017
-
RC2: 'Follow up', Anonymous Referee #1, 28 Aug 2017
- AC2: 'Reply to reviewer # 1', Guebuem Kim, 18 Sep 2017
-
RC2: 'Follow up', Anonymous Referee #1, 28 Aug 2017
-
AC1: 'Reply to reviewer # 1', Guebuem Kim, 24 Aug 2017
-
RC3: 'Review report', Anonymous Referee #2, 30 Aug 2017
- AC3: 'Reply to reviewer # 2', Guebuem Kim, 18 Sep 2017
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Cited
2 citations as recorded by crossref.
- Formation of substances with humic-like fluorescence properties, upon photoinduced oligomerization of typical phenolic compounds emitted by biomass burning D. Vione et al. 10.1016/j.atmosenv.2019.03.005
- Size-Segregated Chemical Compositions of HULISs in Ambient Aerosols Collected during the Winter Season in Songdo, South Korea K. Jang et al. 10.3390/atmos10040226