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| 광주 도심지점에서 늦가을 PM2.5/ PM10의 변화에 의한 2차 무기염 성분들의 축적모드 크기분포 변화 | |||||
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| 글쓴이 | 관리자 (IP: *.223.176.122) | 작성일 | 2022-11-07 13:34 | 조회수 | 127 |
광주 도심지점에서 늦가을 PM2.5/PM10의 변화에 의한 2차 무기염 성분들의 축적모드 크기분포 변화 Investigation on Change in Accumulation Mode Size Distributions of Secondary Inorganic Salts with PM2.5/PM10 during Late Fall at an Urban Site in Gwangju Abstract In this study, size-resolved measurements of ambient particulate matter (PM) were conducted during late fall at
an urban site in Gwangju, Korea, to examine change in accumulation mode size distributions of the ambient PM. The size
distributions of ambient PM and its secondary inorganic species were classified into two groups based on the PM2.5/PM10
observed at an air pollution monitoring station close to the study site. Measurement period corresponding to the first group
(PM2.5/PM10<0.5) was characterized by both stable air patterns(e.g., weak wind speeds(<1.0 m/s) and high relative humidity
(RH) (59~83%) and predominance of local influence. On the other side, the second group (PM2.5/PM10>0.6) was also
characterized by the stable weather patterns such as weak wind speeds, very high RH (72~93%), and low temperature, but
affected by the local influences and external influences from long-range transports. For the first group, ambient PM and its
secondary inorganic components (NO3
-, SO4
2-, and NH4
+) showed bi-modal size distributions, with predominance of
condensation mode peaking at 0.32 µm, suggesting they may have been formed through by homogeneous gas-phase
reaction followed by condensation on preexisting particles. For the second group, they exhibited also bi-modal size
distributions with very prominent droplet modes peaking at 0.55~1.0 µm, suggesting that the RH and long-range
transportation of aerosol particles may have played an important role in shaping their size distributions of droplet mode.
These changes in the size distributions during the second group period resulted in increases in PM2.5/PM10. Key words Size-resolved measurements of aerosol particles, PM2.5/PM10, Secondary inorganic salts, Bi-modal size distribution, Stable weather conditions, Long-range transportation ▶출처 : 한국대기환경학회지 제 38권 제 5 호, 2022.10 p.641-652 |
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| 파일 | 광주 도심지점에서 늦가을 PMSUB2.5SUBPMSUB10SUB의 변화에 의한 2차 무기염 성분들의 축적모드 크기분포 변화.pdf(2.2M) | ||||