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Investigation of the CCN Activity, BC and UVBC Mass Concentrations of Biomass Burning Aerosols during the 2013 BASELInE CampaignBiomass-burning (BB) aerosols, acting as cloud condensation nuclei (CCN), can influence cloud microphysical and radiative properties. In this study, we present CCN measured near the BB source regions over northern Southeast Asia (Doi Ang Khang, Thailand) and at downwind receptor areas (Lulin Atmospheric Background Station, Taiwan), focusing exclusively on 13-20 March 2013 as part of 2013 spring campaign of the Seven SouthEast Asian Studies (7-SEAS) intensive observation. One of the campaigns objectives is to characterize BB aerosols serving as CCN in SouthEast Asia (SEA). CCN concentrations were measured by a CCN counter at 5 supersaturation (SS) levels: 0.15%, 0.30%, 0.45%, 0.60%, and 0.75%. In addition, PM2.5 and black carbon mass concentrations were analyzed by using a tapered element oscillating microbalance and an aethalometer. It was found the number-size distributions and the characteristics of hygroscopicity (e.g., activation ratio and k) of BB aerosols in SEA have a strong diurnal pattern, and different behaviors of patterns were characterized under two distinct weather systems. The overall average value was low (0.05-0.1) but comparable with previous CCN studies in other BB source regions. Furthermore, a large fraction of UV-absorbing organic material (UVBC) and high Delta-C among BB aerosols were also observed, which suggest the existence of substantial particulate organic matter in fresh BB aerosols. These data provide the most extensive characterization of BB aerosols in SEA until now.
Document ID
20170006133
Document Type
Reprint (Version printed in journal)
Authors
Hsiao, Ta-Chih (National Central Univ. Chung-Li, Taiwan, Province of China)
Ye, Wei-Cheng (National Central Univ. Chung-Li, Taiwan, Province of China)
Wang, Sheng-Hsiang (National Central Univ. Chung-Li, Taiwan, Province of China)
Tsay, Si-Chee (NASA Goddard Space Flight Center Greenbelt, MD United States)
Chen, Wei-Nai (Academia Sinica, Nankang Taipei, Taiwan, Province of China)
Lin, Neng-Huei (National Central Univ. Chung-Li, Taiwan, Province of China)
Lee, Chung-Te (National Central Univ. Chung-Li, Taiwan, Province of China)
Hung, Hui-Ming (National Central Univ. Chung-Li, Taiwan, Province of China)
Chuang, Ming-Tung (National Central Univ. Chung-Li, Taiwan, Province of China)
Chantara, Somporn (Chiang Mai Univ. Thailand)
Date Acquired
July 6, 2017
Publication Date
November 9, 2015
Publication Information
Publication: Aerosol and Air Quality Research
Volume: 16
Issue: 11
ISSN: 1680-8584
Subject Category
Environment Pollution
Report/Patent Number
GSFC-E-DAA-TN43544
Distribution Limits
Public
Copyright
Other
Keywords
biomass burning aerosol
cloud condensation nuclei