In Situ Measurements of CCN Activity and Aerosol Optical Properties at Biomass Burning Source and Receptor Regions

• Main Authors: Wei-Cheng Ye, 葉威成
• Other Authors: Ta-Chih Hsiao
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/mbs93m

碩士 === 國立中央大學 === 環境工程研究所 === 104 === The first part of this study included a 2-year observation of aerosol optical properties were investigated during 2013 to 2014 at Lulin atmospheric background station (LABS) which is located at downstream of Indochina and China. and a 1-month observation conducted at BB source region, Doi Ang Kang (DAK) during 2013 BASELInE campaign. The objectives in this part of study are to investigate the extensive and intensive optical properties of aerosol at LABS in 2013 and 2014 with ground-based measurements and to study the long-range transport of BB aerosol based on aerosol optical properties.The long range transport of BB aerosol significantly influence the optical properties observed in LABS during spring time. The intensive properties had maimum value in spring time which is 85.18 Mm-1 and 12.00 Mm-1 for scattering and absorption coefficient respectively. For extensive properties, the low single scattering albedo (SSA= 0.87) and high radiative forcing efficiency (RFE= -18.61 Wm-2/AOD) revealed the high content of absorbing material which were affected by the effect of BB in springtime. The other part of this study focused on the cloud condensation nuclie (CCN) activity and black carbon (BC) at BB source region, DAK. The objectives in this part of study are to study CCN activity, PM2.5 and BC mass conc. in BB source region of Southeast Asia. The observation can be labeled as aged BB event (3/13~3/16) and fresh BB event (3/17~3/19). The aerosol hygroscopicity parameter were 0.08 for aged period and 0.05 for fresh period. The BC880nm/BC370nm was 0.84 and 0.72 for aged and fresh BB period respectively, suggesting the existence of larger scale of burning event or fresher BB aerosols were measured in 3/17~3/19.