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Aerosol Optical Properties at the Lulin Atmospheric Background Station in Taiwan and the Influences of Long-Range Transport of Air PollutantsThe Lulin Atmospheric Background Station (LABS, 23.47 deg. N 120.87 deg. E, 2862 m ASL) in Central Taiwan was constructed in 2006 and is the only high-altitude background station in the western Pacific region for studying the influence of continental outflow. In this study, extensive optical properties of aerosols, including the aerosol light scattering coefficient [Sigma(sub s)] and light absorption coefficient [Sigma(sub a)], were collected from 2013 to 2014. The intensive optical properties, including mass scattering efficiency [Sigma(sub s)], mass absorption efficiency [Sigma(sub a)] single scattering albedo (Omega), scattering Angstrom exponent (A), and backscattering fraction (b), were determined and investigated, and the distinct seasonal cycle was observed. The value of [Alpha(sub a)] began to increase in January and reached a maximum in April; the mean in spring was 5.89 m(exp. 2) g(exp. -1) with a standard deviation (SD) of 4.54 m(exp. 2) g(exp. -1) and a 4.48 m(exp. 2) g(exp. -1) interquartile range (IQR: 2.95-7.43 m(exp. 2) g(exp. -1). The trend was similar in [Sigma(sub a)], with a maximum in March and a monthly mean of 0.84 m(exp. 2) g(exp. -1). The peak values of Omega (Mean = 0.92, SD = 0.03, IQR: 0.90 - 0.93) and A (Mean = 2.22, SD = 0.61, IQR: 2.12 = 2.47) occurred in autumn. These annual patterns of optical properties were associated with different long-range transport patterns of air pollutants such as biomass burning (BB) aerosol in spring and potential anthropogenic emissions in autumn. The optical measurements performed at LABS during spring in 2013 were compared with those simultaneously performed at the Doi Ang Kang Meteorology Station, Chiang Mai Province, Thailand (DAK, 19.93 deg. N, 99.05 deg. E, 1536 m a.s.l.), which is located in the Southeast Asia BB source region. Furthermore, the relationships among [Sigma(sub s)], [Sigma(sub a)], and (b) were used to characterize the potential aerosol types transported to LABS during different seasons, and the data were inspected according to the HYSPLIT 5-day backward trajectories, which differentiate between different regions of air mass origin.
Document ID
20170003711
Document Type
Reprint (Version printed in journal)
Authors
Hsiao, Ta-Chih (National Central Univ. Taoyuan, Taiwan, Province of China)
Chen, Wei-Nai (Academia Sinica Taipei, Taiwan, Province of China)
Ye, Wei-Cheng (National Central Univ. Taoyuan, Taiwan, Province of China)
Lin, Neng-Huei (National Central Univ. Taoyuan, Taiwan, Province of China)
Tsay, Si-Chee (NASA Goddard Space Flight Center Greenbelt, MD United States)
Lin, Tang-Huang (National Central Univ. Taoyuan, Taiwan, Province of China)
Lee, Chung-Te (National Central Univ. Taoyuan, Taiwan, Province of China)
Chuang, Ming-Tung (National Central Univ. Taoyuan, Taiwan, Province of China)
Pantina, Peter (Science Systems and Applications, Inc. Greenbelt, MD, United States)
Wang, Sheng-Hsiang (National Central Univ. Taoyuan, Taiwan, Province of China)
Date Acquired
April 20, 2017
Publication Date
November 12, 2016
Publication Information
Publication: Atmospheric Environment
Volume: 150
ISSN: 1352-2310
Subject Category
Environment Pollution
Statistics and Probability
Earth Resources and Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN41856
Funding Number(s)
CONTRACT_GRANT: NNG12HP08C
Distribution Limits
Public
Copyright
Other
Keywords
aerosol optical properties
biomass burning