Long-term observed visibility in eastern thailand: temporal variation, association with air pollutants and meteorological factors, and trends

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Aman N., Manomaiphiboon K., Pengchai P., Suwanathada P., Srichawana J., Assareh N.

ผู้เผยแพร่: MDPI

ปีที่เผยแพร่ (ค.ศ.): 2019

วารสาร: Atmosphere (2073-4433)

Volume number: 10

Issue number: 3

นอก: 2073-4433

eISSN: 2073-4433

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063459760&doi=10.3390%2fatmos10030122&partnerID=40&md5=66077344db64f1442760f74211af0f90

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

The present study analyzed long-term observed visibility over Eastern Thailand, with a focus on urbanized/highly industrialized coastal areas. The temporal coverage spans 9 to 35 years for visibility data and 9 to 15 years for air quality data for the selected stations. Visibility shows strong seasonality and its degradation intensifies in the dry season. It shows a negative correspondence with PM10 and relative humidity, which is evident from different methods. Visibility has strong dependence on wind direction, suggesting the influence of local pollution sources. Back-trajectory results suggest important influences of long-range transport and humidity. Secondary aerosol formation has the potential to aggravate visibility based on a precursor-ratio method. The trends in average visibility at most stations in recent years show negative shift, decreasing direction, or persistence of relatively low visibility, possibly due to increase in air pollution. Contrast was found in the meteorologically adjusted trend (based on generalized linear models) in visibility and PM10, which is partly attributed to the role of fine particles. The study suggests that visibility degradation is a problem in Eastern Thailand and is affected by both air pollutants and meteorology. The study hopes to get attention from policymakers regarding issue of visibility degradation in the region. ฉ 2019 by the authors.

คำสำคัญ

Back-trajectory clustering, Meteorologically adjusted trend, Polar plot, Secondary aerosol precursors, Visibility