2020 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 / Light absorption / Filter observation / Sky radiometer / AAE / AAOD |
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| Outline of Annual Research Achievements |
In fiscal year 2020, light absorption properties of BrC were compared between those derived from filter samples collected using PX375 PM2.5 monitor and those evaluated based on sky radiometer observation in spring of 2018. The light absorption coefficient of BrC based on filter measurement showed similar temporal trend with ambient concentration of black carbon, indicating their general combustion sources. Absorption angstrom exponent over the wavelength range of 340 to 870 nm derived based on sky radiometer observation was estimated 15% higher in spring than that over the whole year, suggesting that the Asian outflow is carrying light absorbing aerosols to Fukue Island and the western North Pacific region. The related results were presented at 3 international and domestic conferences (JpGU, AGU and JpSAC).
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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
Filter samples were continuously collected based on high-volume air sampler. Processing scheme for sky radiometer data was established. Comparisons on light absorption properties of BrC aerosols based on filter and sky radiometer observations were conducted. The planned target is achieved.
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| Strategy for Future Research Activity |
Further analyzing light absorption properties of BrC based on filter samples and sky radiometer observations. Provide scientific information regarding the characteristics of the two methods. BrC sources will be investigated based on for the relations with Asian outflow from anthropogenic and biomass burning sources.
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| Causes of Carryover |
Due to the spreading of COVID-19, plans about on-site observations and maintenances were changed. In fiscal year 2021, such funding will be used as personnel expenditure for instrument maintenance by local people at Fukue Island.
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