2019 Fiscal Year Research-status Report
Light absorption properties of brown carbon aerosols in East Asia and source apportionment
| Project/Area Number |
19K20447
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
朱 春茂 国立研究開発法人海洋研究開発機構, 地球環境部門(地球表層システム研究センター), 研究員 (00807513)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | Brown carbon aerosol / Filter observation / Methanol extraction |
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| Outline of Annual Research Achievements |
The purposes of the study were to unveil the temporal variations of light absorption properties of brown carbon (BrC) aerosols, and to identify the sources of BrC aerosols, based on observations at Fukue Island, Nagasaki prefecture.
In fiscal year 2019, methods for quantifying light absorption properties of BrC aerosols based on filter observation were investigated on pre-collected filter samples. In comparison with those extraction by water, BrC extracted using methanol had higher light absorption. Methanol extraction will be adopted for future analysis of BrC light absorption properties. Aerosols were newly collected at Fukue Island based on high-volume air sampler from Autumn 2019, providing filters for quantifying light absorption properties of BrC aerosols. Absorption aerosol optical depth based on SKYNET observational data at Fukue Island were derived and absorption angstrom exponent were evaluated. After collecting meteorological data, atmospheric transport model Flexpart (v10) was used to test the sensitivity of simulation starting from Fukue Island. Such progresses provide basis for comparison of light absorption properties of BrC aerosols based on filter sampling and SKYNET observations.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Methods for quantifying light absorption properties of BrC aerosols based on filter observations were established. Filter samples were collected based on high-volume air sampler. Light absorption properties of BrC aerosols based on SKYNET observations were derived. The planned target in this fiscal year is achieved.
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| Strategy for Future Research Activity |
Analyzing samples collected based on air sampler and quantify light absorption properties. Continuing quantification of Light absorption properties of BrC aerosols based on SKYNET observations. Based on the obtained temporal variation of BrC, investigate on the sources of BrC during pollution events.
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| Causes of Carryover |
Aerosol sampling method was modified because the malfunction occurred on the planned instrument. Thus, The corresponding funding for aerosol light absorption analysis were changed. In fiscal year 2020, such funding will be used for aerosol light absorption analysis based on modified method.
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Research Products
(1 results)
