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Radiative Effect of Springtime Biomass-Burning Aerosols over Northern Indochina During 7-SEAS Baseline 2013 CampaignThe direct aerosol radiative effects of biomass-burning (BB) aerosols over northern Indochina were estimated by using aerosol properties (physical, chemical, and optical) along with the vertical profile measurements from ground-based measurements with integration of an optical and a radiative transfer model during the Seven South East Asian Studies Biomass-Burning Aerosols Stratocumulus Environment: Lifecycles Interactions Experiment (7-SEASBASELInE) conducted in spring 2013. Cluster analysis of backward trajectories showed the air masses arriving at mountainous background site (Doi Ang Khang; 19.93degN, 99.05degE, 1536 m above mean sea level) in northern Indochina, mainly from near-source inland BB activities and being confined in the planetary boundary layer. The PM(sub10) and black carbon (BC)mass were 87 +/- 28 and 7 +/- 2 micrograms m(exp -3), respectively. The aerosol optical depth (AOD (sub 500) was found to be 0.26--1.13 (0.71 +/- 0.24). Finer (fine mode fraction is approximately or equal to 0.95, angstrom-exponent at 440-870 nm is approximately or equal to 1.77) and significantly absorbing aerosols(single scattering albedo is approximately or equal to 0.89, asymmetry-parameter is approximately or equal to 0.67, and absorption AOD 0.1 at 440 nm) dominated over this region. BB aerosols (water soluble and BC) were the main contributor to the aerosol radiative forcing (ARF), while others (water insoluble, sea salt and mineral dust) were negligible mainly due to their low extinction efficiency. BC contributed only 6 to the surface aerosol mass but its contribution to AOD was 12 (2 times higher). The overall mean ARF was 8.0 and -31.4 W m(exp -2) at top-of-atmosphere (TOA) and at the surface (SFC), respectively. Likely, ARF due to BC was +10.7 and -18.1 W m(exp -2) at TOA and SFC, respectively. BC imposed the heating rate of +1.4 K d(exp -1) within the atmosphere and highlighting its pivotal role in modifying the radiation budget. We propose that to upgrade our knowledge on BB aerosol radiative effects in BB source region, the long-term and extensive field measurements are needed.
Document ID
20170006140
Document Type
Reprint (Version printed in journal)
Authors
Pani, Shantanu Kumar (National Central Univ. Chung-Li, Taiwan, Province of China)
Wang, Sheng-Hsiang (National Central Univ. Chung-Li, 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)
Tsay, Si-Chee (NASA Goddard Space Flight Center Greenbelt, MD United States)
Holben, Brent N. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Janjai, Serm (Silpakorn Univ. Nakhon, Thailand)
Hsiao, Ta-Chih (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
September 7, 2016
Publication Information
Publication: Aerosol and Air Quality Research
Volume: 16
ISSN: 1680-8584
Subject Category
Earth Resources and Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN43528
Distribution Limits
Public
Copyright
Other
Keywords
aerosol optical properties
biomass burning