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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-554
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
05 Jul 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Significant Seasonal Change in Optical Properties by atmospheric humic-like substances (HULIS) in Water-Soluble Organic Carbon Aerosols
Heejun Han and Guebuem Kim School of Earth and Environmental Sciences/RIO, Seoul National University, Seoul 08826, Korea
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.

Citation: Han, H. and Kim, G.: Significant Seasonal Change in Optical Properties by atmospheric humic-like substances (HULIS) in Water-Soluble Organic Carbon Aerosols, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-554, in review, 2017.
Heejun Han and Guebuem Kim
Heejun Han and Guebuem Kim
Heejun Han and Guebuem Kim

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Short summary
This paper evaluates significant seasonal changes in atmospheric humic-like substance (HULIS) and water-soluble organic carbon (WSOC) in Seoul, Korea. We found that these changes were greatly induced by UV radiation over different seasons, and this was further confirmed by a laboratory experiment. Our results suggest that photochemical degradation plays a significant role in HULIS abundances in the atmosphere and might be an important removal mechanism of light-absorbing organic aerosols.
This paper evaluates significant seasonal changes in atmospheric humic-like substance (HULIS)...
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